Article
Construction & Building Technology
Gao-Le Zhang, Wen-Jun Zhang, Hong-Liang Li, Wen-Zhen Cao, Bo-Da Wang, Wei-She Guo, Pan Gao
Summary: This study investigated the waterproofing and mechanical behavior of sealing gaskets for circumferential joints in the Tianjin metro line Z2 tunnel through a full-scale experiment. It found that both joint opening and offset greatly influenced the gasket waterproof behavior, and even a small change in gasket opening area could lead to a significant variation in performance.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Xiang Shen, Dajun Yuan, Liqiang Cao, Yanbin Fu, Dalong Jin, Zhenfeng Gao
Summary: This research developed a test device to study the sealing performance of shield tail grease under high water pressure, and investigated the influence of water pressure on the grease's watertightness under different conditions. The study found that high water pressure significantly affected the sealing performance of the grease, and the presence of dynamic boundaries facilitated sealing failure. Increasing the wire density of the shield tail brush improved the sealing performance of the shield tail. Different types of grease had different sealing failure modes. The results of the model test were verified and analyzed through ANSYS-CFD numerical simulation.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Chenjie Gong, Yuanye Wang, Wenqi Ding, Mingfeng Lei, Chenghua Shi
Summary: This article discusses the prominent contributions to the waterproof performance of sealing gaskets in shield tunnels, including structural behavior, material constitutive models, numerical simulation methods, and thermal-mechanical coupling analysis. While fruitful, there are still areas that need further exploration, such as material aging mechanisms under special conditions and enhanced testing methods.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Ze-Nian Wang, Shui-Long Shen, Annan Zhou, Hai-Min Lyu
Summary: This paper presents experimental investigations on the time-dependent characteristics of EPDM under different temperatures and strain conditions, and proposes a transformation method called the time-temperature-strain/stress superposition principle (TTSSP) to obtain long-term time-dependent characteristics. The results show that TTSSP is suitable for predicting the stress relaxation and creep behavior of EPDM.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Review
Green & Sustainable Science & Technology
Guoqiang Liu, Gang Yan, Jianlin Yu
Summary: Refrigerators consume a large amount of energy worldwide, with the refrigerator gasket playing a crucial role in sealing and thermal insulation. This study provides a comprehensive review of key technologies related to refrigerator gaskets, introducing various research methods and potential areas for future exploration.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Construction & Building Technology
XiangRui Meng, Wei Wu, Hehua Zhu, Yaji Jiao, Rui Jin, Xinbin Tu
Summary: This paper investigates the gas sealing behavior of gasketed joints in the Sutong GIL Utility Tunnel through experimental and computational studies. The experiments measure the air leakage rates through the joints under different pressures and define slight leakage and rapid leakage. The study analyzes the gas sealing behavior of the joints and provides suggestions for improvement based on the results.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Miaotian Zhang, Decai Li, Shuangfu Suo, Jianwen Shi
Summary: The study found that detachment of coating material leads to surface wear of the sealing ring through reciprocating sealing experiments, and proposed optimization suggestions for the processing method of the sealing ring and the selection of the material of the piston rod coating.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Xinrui Li, Xiaoqiang Fan, Zhenggui Li, Minhao Zhu
Summary: Magnetic fluid seals are widely used for gas and vacuum sealing, but their effectiveness decreases when used for liquid sealing. A novel pole structure with a non-magnetic shaft is proposed, which allows for the observation of the seal failure processes through a hollow transparent shaft. The failure occurs in two stages: leakage channel opening and complete seal leakage, and dynamic failure is influenced by dissolution, extrusion, and interface instability, with the magnetic fluid film becoming unstable and leaking at critical speed. The research uncovers key factors for seal failure and highlights the need for understanding the interplay between design, magnetic fluid properties, and operating conditions to develop efficient liquid seals.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Characterization & Testing
Xiangqian Li, Yuyou Yang
Summary: A new sealing performance test method was proposed to evaluate the effectiveness of sealing grease, with the maximum diameter of pores as the indicator. It was observed that sealing grease seals micropores by forming a sealing layer, and the thickness of the layer increases with the size of the pores. The sealing performance improved with higher fiber content, leading to decreased filtration.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Engineering, Manufacturing
Song Gao, Toshiharu Kazama
Summary: Flat flanges are sealed using gaskets made of synthetic materials such as rubber, copper alloys, and plastic. Leakage prevention is achieved through elastic and plastic deformation, but can be challenging due to surface roughness and waviness. Controlling temperature to enhance gasket sealing performance can reduce leakage under both static and vibration conditions.
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2021)
Article
Engineering, Geological
Wei Li, Chengping Zhang, Dingli Zhang, Zijian Ye, Zhibiao Tan
Summary: This paper proposes an improved mechanism for simulating soil movement at tunnel face. The characteristics of velocity distribution are investigated through numerical simulations, and a new kinematically admissible velocity field is proposed based on the simulation results. An improved failure mechanism is constructed using spatial discretization technique, considering soil arching effect and plastic deformation. The accuracy and improvement of the presented method are verified through comparison with numerical simulations, existing analytical studies, and experimental tests.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Xiao-Chuang Xie, Francesca Ceccato, Ming-Liang Zhou, Dong-Mei Zhang
Summary: In this paper, a two-phase single-point material point method (MPM) is used to simulate the evolution of water-soil gushing in shield tunnels and the hydro-mechanical responses of the surrounding soils. The method is validated by experiments and the influence of gushing on the surrounding soil is analyzed. The results show that gushing can be divided into three zones and three stages, and factors such as gushing location, tunnel depth, and soil parameters have significant effects on the gushing process.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Green & Sustainable Science & Technology
Zhihui Zhou, Tonghua Ling, Fu Huang, Min Zhang
Summary: This paper investigates the stability of soil in front of a shield tunnel face under the water table and validates the proposed method through numerical simulation.
Article
Computer Science, Interdisciplinary Applications
Pooyan Jafari, Ahmad Fahimifar
Summary: This paper investigates the face stability of rectangular shield-driven tunnels in undrained clays, where the undrained shear strength increases linearly with depth. Two new failure mechanisms are proposed based on the translational movement of rigid blocks and continuous deformation of soil mass. The analytical solutions are compared with numerical simulations and existing approaches in the literature to evaluate their validity. The critical support pressures obtained from the analytical models are consistent with numerical simulations, and simple design formulas are provided for practical use. Parametric studies explore the impact of different geometrical and geotechnical parameters on tunnel face stability.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Civil
Xiaojing Gao, Pengfei Li, Mingju Zhang, Haifeng Wang, Zenghui Liu, Ziqi Jia
Summary: This study focuses on the mechanical characteristics and mechanism of a bolted circumferential joint in shield tunnels. Simplified analytical algorithms are established to describe the bearing behaviors of the joint under a compressive bending load. Factors affecting the performance of the joint are determined and investigated through numerical simulations. The results provide a theoretical basis for optimizing the design and predicting the damage of bolted segment joints in shield tunnels.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Geological
Tao Yan, Shui-Long Shen, Annan Zhou
Summary: This paper proposes a framework to identify geological characteristics using a fuzzy C-means algorithm based on borehole data and operational data. The identified factors are significantly reduced by principal component analysis, and the types of geological characteristics are determined using the fuzzy C-means model.
Article
Engineering, Geological
Pierre Guy Atangana Njock, Ning Zhang, Annan Zhou, Shui-Long Shen
Summary: This study proposes an improved random forest (IRF) model to evaluate ground displacement caused by jet grouting. By integrating a hybrid particle swarm optimization-simulated annealing algorithm (PSO-SA) into random forest, the IRF model shows better searching and convergence abilities compared to its counterparts. The results demonstrate that the IRF model outperforms benchmark models in predicting ground displacement. Additionally, the analysis of variable importance shows that ground lateral displacement can be controlled through two operating parameters.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Environmental Sciences
Tao Yan, Annan Zhou, Shui-Long Shen
Summary: A new framework for predicting long-term water quality is proposed using Bayesian-optimized machine learning methods and key pollution indicators. The SG-op model achieves the best performance with high accuracy and Kappa coefficient. The framework can efficiently predict future water quality and provide technical support for emergency pollution control.
ENVIRONMENTAL POLLUTION
(2023)
Article
Green & Sustainable Science & Technology
Pierre Guy Atangana Njock, Annan Zhou, Zhenyu Yin, Shui-Long Shen
Summary: This study proposes a flexible methodology for quantifying the risk status of coastal subbasins, which integrates the characteristics of multi-criteria analysis and fuzzy set theory. The methodology includes constructing a risk index to reveal the extent of cumulative nutrients discharges. The application of the proposed model in the Baltic Sea shows an increasing trend of risk index over the years and aligns well with field observations and HELCOM predictions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Xin Liu, Annan Zhou, Kai Sun, Shui-Long Shen
Summary: In this study, the influence of suction on the macro/micro-mechanical behaviour of unsaturated soil was investigated through a series of three-dimensional simulations using the discrete element method. The results were compared with laboratory test results to understand the relationship between macroscopic behavior and micro-mechanical variables.
Article
Construction & Building Technology
Shui-Long Shen, Tao Yan, Annan Zhou
Summary: This paper presents an approach for estimating the locations of the soil-rock interfaces during shield tunnelling based on vibration data. The vibration data were collected using accelerometers on the back of the soil chamber wall. The continuous wavelet transform was used to analyze the time-frequency spectrum of the acceleration and identify vibration peaks. The approach was validated on the Guangzhou-Foshan intercity railway project.
AUTOMATION IN CONSTRUCTION
(2023)
Article
Engineering, Geological
Song-Shun Lin, Annan Zhou, Shui-Long Shen
Summary: Risk events in karst geological environments during excavation construction can be reduced by implementing a suitable risk-control scheme. This study proposes a decision-making approach based on the fuzzy VIKOR method to identify the optimal risk-control scheme. The approach uses a triangular fuzzy set for expressing expert judgements and constructs a decision hierarchy based on four criteria and 12 sub-criteria. The identified scheme, involving pressure grouting with a two-phase liquid system, was validated through core recovery and modified number of blows using a standard penetration test. A flowchart for optimal scheme identification in geotechnical engineering practice is also provided.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
Article
Environmental Sciences
Yu -Lin Chen, Lin-Shuang Zhao, Annan Zhou, Shui-Long Shen
Summary: This paper presents a case study on the hazards of red tides in the Pearl River Estuary. Data on red tide hazards, meteorology, and seawater monitoring were collected from 1996 to 2020 in different locations around the estuary to investigate the factors influencing red tide occurrences. The ASSETS method was used to evaluate the effects of meteorological factors and seawater eutrophication on the risk level of red tides. The study established a framework for red tide risk assessment and identified external and internal factors contributing to red tide formation.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Geological
Ning Zhang, Annan Zhou, Yin-Fu Jin, Zhen-Yu Yin, Shui-Long Shen
Summary: The study proposes an enhanced deep learning method to address the accuracy issue in neural network-based methods for soil stress-strain response. The enhanced method significantly improves accuracy, extrapolation capacity, and robustness. A rationality investigation is conducted into the weight gradient variation in neural networks. The effectiveness is verified through three stress-strain responses of soil, demonstrating improved predictive accuracy and robustness against errors.
Article
Construction & Building Technology
Song-Shun Lin, Annan Zhou, Shui-Long Shen
Summary: This study develops an intelligent multi-criteria decision-making (MCDM) model to select the optimal construction method for complex and fuzzy construction environments in underground infrastructure construction (UIC) in China. The model consists of three stages: decision hierarchy establishment and data collection, data processing, and MCDM modelling. It also introduces the coefficient of variation for spherical fuzzy set to evaluate the degree of consensus on judgments of experts towards evaluated objects, and outlines a decision hierarchy for the optimal construction method for UIC. The developed model provides an alternative approach to address complex decision-making issues in the UIC field.
AUTOMATION IN CONSTRUCTION
(2023)
Article
Engineering, Geological
Wei Cao, Annan Zhou, Shui-Long Shen
Summary: This paper proposes a coupled method for characterizing the stratigraphic uncertainty and rotated anisotropy of soil properties, and investigates the unsaturated soil slope stability considering the two uncertainties. The results show that the proposed method can well characterize the two uncertainties at the same time, and the rotational anisotropy of soil properties has a substantial impact on the slope stability and groundwater table.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Civil
Yi Zeng, Pierre Guy Atangana Njock, Wang Xiong, Xiao-Long Zhang, Shui-Long Shen
Summary: This paper presents a case study on the identification and management of geological and environmental risks during the construction of the largest slurry shield tunnel in China. The ground conditions and settlement control were challenging due to mixed ground conditions, fault zones, and tunneling under residential areas and Metro Lines. Novel monitoring systems, ground treatment, and safety management technologies were successfully implemented. A technical framework was proposed as a risk management guidance for similar tunneling operations.
Article
Energy & Fuels
Shui-Long Shen, Pierre Guy Atangana Njock, Annan Zhou
Summary: This paper investigates the effect of nozzle structure on efficiency of jet flow and determines the optimal nozzles for jet grouting operations through a combination of field experiment, numerical simulation, and multicriteria decision analysis. The results show that 4 out of the 10 structures investigated achieved the steadiest jetting pressure attenuation along different standoff distances, while satisfying the required driving pressure and flow rate. The study identified the converging section as critical for the conversion of viscous force within the nozzle and determined the optimal nozzle structure based on parameters such as L2 and theta.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Khalid Elbaz, Wafaa Mohamed Shaban, Annan Zhou, Shui-Long Shen
Summary: This study proposes an image-based deep learning method that improves air quality recognition and produces accurate multiple horizon forecasts. The proposed model combines a 3D-CNN, a GRU, and an attention mechanism to extract hidden features, recognize environmental variables, extract temporal features, and adjust the influence of features to avoid fluctuations in air pollutant values. Experimental results show that the proposed method outperforms other state-of-the-art methods in terms of forecasting accuracy.
Article
Construction & Building Technology
Tao Yan, Shui-Long Shen, Annan Zhou
Summary: Geological features are crucial for the safety and efficiency of shield tunnelling, but they are often concealed and difficult to observe. To address this issue, a novel index called Geological Feature Identification Index (GFII) has been introduced to evaluate the impact of geological conditions on shield tunnelling. The results show that cutterhead torque and shield thrust weights are significantly affected by various geological features, with the entropy-weighted GFII demonstrating superior performance.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
