Article
Mining & Mineral Processing
Zhe Xiang, Nong Zhang, Yiming Zhao, Dongjiang Pan, Xiaowei Feng, Zhengzheng Xie
Summary: This paper achieved the grouting sealing of low-permeability artificial rocks using silica sol imbibition grouting. The study measured the variations in particle size, viscosity, and contact angle during solidification, as well as the pore size distribution of low-permeability artificial rocks. By combining imbibition theory, percolation theory, and fracture medium grouting principle, the paper discussed the silica sol imbibition mechanism of low-permeability rocks and soil. The research provides a theoretical basis for silica sol grouting sealing of low-permeability argillaceous rocks and is an important reference for application.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Tafadzwa John Shamu, Liangchao Zou, Ulf Hakansson
Summary: The assumption of cement grouts as 'Bingham fluids' has led to development of simplified analytical tools for rock grouting design, but overlooking key phenomena may result in overestimation of grout travel. This study suggests considering shear rate aspects and stop criteria can enhance the use of the Bingham model for grouting design.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Polymer Science
Milad Abolfazli, Milad Bazli, Hossein Heydari, Ahmad Fahimifar
Summary: This study compared the shear behavior of cement grouting and chemical grouting (using epoxy and polyurethane) and found that grouting improves the shear strength and cohesion of rock joints. Cement grouts exhibit brittle behavior while chemical grouts are more ductile. The friction angle increases with larger joint size due to the distribution of random peaks and valleys on the joint surface.
Article
Energy & Fuels
Inigo Escobal-Marcos, Martina-Inmaculada Alvarez-Fernandez, Maria-Belen Prendes-Gero, Celestino Gonzalez-Nicieza
Summary: This paper discusses the design of a waterproofing screen for an underground basement near the Bilbao estuary, focusing on rock mass survey and grout injection tests to address water seepage issues in underground constructions.
Article
Chemistry, Multidisciplinary
Ahmed S. A. Al-Gharbawi, Ahmed M. Najemalden, Mohammed Y. Fattah
Summary: This study explores the use of lime, cement, and silica fume to stabilize expansive soil. The results show that the soil stabilized with different percentages of these materials significantly reduces free swell and swelling pressure. Additionally, grouting with silica fume greatly enhances the bearing capacity of footings on the treated soil.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Hamza Gullu, Mehmet Emin Yetim, Elif Bacak Gullu
Summary: This study investigates the rheological abilities of nano-silica added to Portland cement based-grouts for ground improvement. The results indicate that low to moderate dosages of nano-silica (<2.5%NS) at a water/binder ratio of 1 yielded more favorable flow. The strength tests show that increasing nano-silica dosage proportionally increased the unconfined compressive strength (UCS) up to 2%NS, then gradually decreased. The moderate replacements (1.5%NS-2%NS) appeared better for flow issues and provided sufficient bearing strength in ground enhancement.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Asieh Davoodi, Mohsen Aboutalebi Esfahani, Meysam Bayat, Seyed Esmaeil Mohammadyan-Yasouj
Summary: The study found that 0.5% to 1% NS can prevent fluidity loss and increase drying shrinkage in the matrix. Three of the best performing mortars were evaluated, with the optimum mixture being NS1-RP5 containing 1% NS and 5% RP. This mixture exhibited the best performance and mechanical properties with an elastic modulus loss of about 20%.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhe Xiang, Nong Zhang, Dongjiang Pan, Zhengzheng Xie, Yiming Zhao
Summary: A composite grouting material with a multi-particle size distribution was developed for microcrack sealing and reinforcement in mudstone. The material exhibited enhanced injectability and solidification properties, resulting in improved mechanical strength and compactness of the structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Zhe Xiang, Nong Zhang, Dongjiang Pan, Zhengzheng Xie
Summary: This study conducted tests on the modification and reinforcement of muddy soft rocks using silica sol, and obtained the basic laws of silica sol grouting and anti-seepage reinforcement for mudstone. The research found that silica sol slurry has good injectability and permeability, significantly reducing porosity and permeability of mudstone. Silica sol is a prime candidate for grouting and sealing applications in muddy tunnel projects.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Xifeng Du, Haoyuan Cheng, Shengjie Xu, Wenjun Pei
Summary: Through systematic research on the temperature field and deflection test of cement pavement, a three-dimensional finite element model was established to analyze the influence of temperature difference on the pavement deflection. The correlation between temperature difference and influence coefficient was summarized, and a method for identifying voids in cement pavement and evaluating the effect of polymer grouting considering temperature effect was proposed.
Article
Construction & Building Technology
Almir Draganovic, Antranik Karamanoukian, Peter Ulriksen, Stefan Larsson
Summary: The study investigates the use of ultrasound to improve the dispersion of grouts based on ultrafine milled cement, with results showing that ultrasound is the most effective method. Comparing with conventional laboratory mixers, ultrasound is able to disperse fine particles grout better, achieving a significant improvement in sealing fracture apertures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Zhi Qin, Quanjun Shi, Dong Qin, Haihua Wang, Yuejing Luo, Wensheng Wang
Summary: This study compares and evaluates different grouting pastes for goaf treatment. The research identifies the relationship between the properties of grouting pastes and factors such as water-solid ratio and curing time. It also addresses the geological risks in goaf areas and proposes a treatment plan based on drilling television data. The study evaluates the effectiveness of backfill grouting using ground-penetrating radar technology.
FRONTIERS IN MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Yue Wu, Wei-guo Qiao, Yan-zhi Li, Shuai Zhang, De-kang Sun, Chao Tang, Hui-ni Liu, Tong-jie Wang
Summary: This study develops a high-similarity rock material using waste materials for the repair and strengthening of engineering rock masses. The environmentally friendly material can be used as an alternative to traditional materials for emergency repairs and reinforcement at project sites.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Multidisciplinary
Xiaochen Wang, Fei Xiao, Qingsong Zhang, Annan Zhou, Rentai Liu
Summary: An experimental system was established to study grout flow through rock fractures with rough surfaces, providing insights into the uneven penetration of grout and the changing concentration of cement slurry along the penetration zone. The study found that water bled from the slurry penetration front at low speeds, and the concentration of cement slurry decreased along the direction of penetration, indicating a flow thinning trend.
Article
Multidisciplinary Sciences
Rosangela Maria Ferreira da Costa e Silva, Ivana Marcia Alves Diniz, Natalia Aparecida Gomes, Guilherme Jorge Brigolini Silva, Jose Maria da Fonte Ferreira, Rubens Lucas de Freitas Filho, Erico Tadeu Fraga Freitas, Darliane Aparecida Martins, Rosana Zacarias Domingues, Angela Leao Andrade
Summary: This study developed a bioactive composite material, BG-Carb, by treating ashes from the Equisetum hyemale plant. It overcomes the drawbacks of toxic reagents and high calcination temperatures in traditional synthesis methods. BG-Carb exhibits a large specific surface area and the ability to form a hydroxyapatite surface layer. It shows no cytotoxicity and has osteo-differentiation capacity.
SCIENTIFIC REPORTS
(2022)
Article
Construction & Building Technology
Zhi Ding, Xiao Zhang, Shao-Heng He, Yong-Jie Qi, Cun-Gang Lin
Summary: This study investigates the longitudinal behavior of a shield tunnel by designing and constructing a reduced-size indoor model. The results show that the longitudinal settlement of the tunnel follows a normal distribution, with the maximum settlement occurring at the central ring and increasing linearly with the applied load. Stress concentration typically occurs on the side of the tunnel waist under surcharge, resulting in transverse elliptical deformation of the entire structure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Lucia Lopez-de-Abajo, Marcos G. Alberti, Jaime C. Galvez
Summary: Assessing and predicting concrete damage is crucial for infrastructure management. This study quantifies gas concentrations in urban tunnels to achieve this goal.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Chao He, Yinghao Cai, Chenqiang Pu, Shunhua Zhou, Honggui Di, Xiaohui Zhang
Summary: This paper investigates the impact of river channel excavation on adjacent metro tunnels and proposes protective measures based on an engineering project in Fuzhou, China. A three-dimensional finite element model is developed to calculate the displacements and distortion of tunnels under different excavation sequences and soil reinforcement measures. Real-time monitoring confirms that the vertical displacements and diametrical distortion of tunnels are primarily caused by the excavation of the river above the tunnels, while horizontal displacements are induced by the excavation next to the tunnels. The study recommends a combination of cement slurry with a portal form and concrete with a plate form for soil reinforcement and tunnel protection.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Yaosheng Liu, Ang Li, Feng Dai, Ruochen Jiang, Yi Liu, Rui Chen
Summary: In this study, a hybrid model based on a multilayer perceptron (MLP) and meta-heuristic algorithms was developed to improve blast performance during tunnel excavation. Precise prediction of post-blasting indicators was important for optimization, and a comparison of meta-heuristic algorithms was conducted to find the most suitable model. The results showed that the developed model effectively reduces overbreak areas and quantitatively analyzes the influence of geological conditions.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Xiang Shen, Yifan Chen, Liqiang Cao, Xiangsheng Chen, Yanbin Fu, Chengyu Hong
Summary: In this paper, a machine learning-based method for predicting the slurry pressure in shield tunnel construction is proposed. By considering the influence of fault fracture zones and setting the formation influence coefficient, the accuracy of the prediction is significantly improved.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Shuying Wang, Zihao Zhou, Xiangcou Zheng, Jiazheng Zhong, Tengyue Zheng, Changhao Qi
Summary: A real-time assessment and monitoring approach based on laser scanning technology and point cloud data analysis was proposed to address the hysteresis in assessing the workability of conditioned soils and the inefficiency in estimating the soil volume flow rate in tunnelling practice. The approach was successfully applied in identifying the workability of conditioned soil and its discharge rate in the EPB shield tunnelling project.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Peng Jiang, Benchao Liu, Yuting Tang, Zhengyu Liu, Yonghao Pang
Summary: This study introduces a novel deep learning-based electrical method that jointly inverses resistivity and chargeability to estimate water-bearing structures and water volume. Compared with traditional linear inversion methods, the proposed method demonstrates superiority in locating and delineating anomalous bodies, reducing solution multiplicity.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Haoyu Mao, Nuwen Xu, Zhong Zhou, Chun Sha, Peiwei Xiao, Biao Li
Summary: The study focuses on the delineation of rock mass damage zones and stability analysis of underground powerhouse in Lianghekou hydropower station. ESG monitoring system is used to monitor the inner micro-fracture activity of surrounding rock mass in real-time. Engineering analogy method is adopted to forecast the deformation period of surrounding rock mass and analyze the variation characteristics of seismic source parameters. The research results provide references for similar deep underground excavation engineering in terms of design and construction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Junling Qiu, Dedi Liu, Kai Zhao, Jinxing Lai, Xiuling Wang, Zhichao Wang, Tong Liu
Summary: This study focuses on the construction surface cracks of large cross-section tunnels in loess strata of China. The mechanism of surface crack formation is analyzed, and factors such as settlement deformation, construction scheme, and surrounding soil environment are identified as the main contributors. Numerical simulations were conducted to gain a deeper understanding of the influence of factors on surface cracks in loess tunnel construction. Specific measures for prevention and treatment of construction surface cracks are proposed to provide new ideas for surface crack control in loess tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Shang, Jiaxin Lu, Ying Luo, Song Wang, Zhengyu He, Aobo Wang
Summary: The study reveals significant variations in car-following behavior across different types of tunnels and consecutive sections of the same tunnel. As tunnel length increases, the driving stability of following vehicles decreases, but the level of driving safety risk is not positively correlated with tunnel length. Significant vehicle trajectory oscillation is observed within the inner sections of long and extra-long tunnels, and a significant relationship between the acceleration of following vehicles and the location within the tunnel section is found.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Rusi Zeng, Zhongwei Shen, Jun Luo
Summary: The urban underground complexes (UUCs) in China have been effective in solving urban problems, but users have expressed dissatisfaction with the internal physical environment. Personal characteristics and environmental factors play significant roles in determining users' satisfaction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Gabriel Lehmann, Heiko Kaeling, Sebastian Hoch, Kurosch Thuro
Summary: Analysing and predicting the advance rate of a tunnel boring machine (TBM) in hard rock is important for tunnelling projects. This study focuses on small-diameter TBMs and their unique characteristics, such as insufficient geotechnical information and special machine designs. A database of 37 projects with 70 geotechnically homogeneous areas is compiled to investigate the performance of small-diameter TBMs. The analysis shows that segment lining TBMs have higher penetration rates, and new approaches for the penetration prediction of pipe jacking machines in hard rock are proposed.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Ren, Ming Qiao, Jon Roberts, Jennifer Hines, Yang-Wai Chow, Wei Zong, Adrian Sugden, Mark Shepherd, Matthew Farrelly, Gareth Kennedy, Faisal Hai, Willy Susilo
Summary: Long-term exposure to coal and silica dust during underground tunnelling operations is a growing concern. To bridge the gap between knowledge in dust exposure monitoring and frontline workers, a virtual reality educational tool was developed to visualize ventilation and dust flow characteristics. This tool allows workers to better understand decision-making and best practices for dust controls.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Dong Lin, Zhipeng Zhou, Miaocheng Weng, Wout Broere, Jianqiang Cui
Summary: Metro systems play a vital role in the transportation, economic, environmental and social aspects of cities. The uncertainties in construction, passenger comfort and safety, as well as efficiency and reliability of the metro system, have been widely studied. Metro systems influence urban development and have a positive impact on housing prices, public health, and environmental quality. Further research is needed to fill the research gaps and make recommendations for future studies.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Wei Yu, Bo Wang, Xin Zi, Jie Dong
Summary: In this study, a whole-process analytical theory for the coupled deformation of deep circular tunnel surrounding rock and prestressed yielding anchor bolt (cable) system is derived and validated through numerical simulations. The results show that anchor bolts (cables) can significantly reduce the convergence of surrounding rock, and factors such as support timing and anchor cable length have important effects on the support effectiveness.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
