Article
Engineering, Marine
Qiguang Di, Pengfei Li, Mingju Zhang, Wenjun Zhang, Xinyu Wang
Summary: In this study, a new model based on the three-dimensional hydraulic head distribution model and the upper bound theorem of the limit analysis was established to calculate the limit support pressure in shield tunnel faces. The accuracy of the proposed model was evaluated through numerical simulations and compared with other analytical methods. The results showed that the proposed method outperforms other methods in terms of accuracy, and the influence of water level, internal friction angle, burial depth, and water pressure on tunnel face stability was analyzed.
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
Construction & Building Technology
Fabricio Fernandez, Jhonatan E. G. Rojas, Euripedes A. Vargas Jr, Raquel Q. Velloso, Daniel Dias
Summary: In this study, the collapse conditions of shallow tunnel faces were investigated using Numerical Limit Analysis (NLA) and Material Point Method (MPM). Both methods were found to be effective in predicting the global failure mechanism and minimum tunnel face pressure needed for stability.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Kaihang Han, Lin Wang, Dong Su, Chengyu Hong, Xiangsheng Chen, Xing-Tao Lin
Summary: A new three-dimensional limit equilibrium model is proposed to address the issue of tunnel face stability traversing the fault fracture zone with high hydraulic pressure, taking into account the influence of geological interface. By modifying the existing formula and conducting comparisons with numerical simulations, the proposed trapezoid-prism model shows promising predictive results.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Construction & Building Technology
Can Wang, Jing Hou, Yun-Min Chen, Xiao-Wei Ye, Wei-Jiang Chu
Summary: In order to prevent tunnel collapse during construction, it is necessary to determine and apply a critical support pressure on the tunnel face. This paper presents the development of a new 3D limit equilibrium model that incorporates the geometries of a lower torus and an upper silo. The model considers different lateral stress coefficients for the silo and the torus geometry under different arching levels, as well as the interface behavior between the sliding torus and the surrounding soils. Validated with centrifuge tests, analytical and numerical tests, the proposed 3D model based on a realistic side rotational mechanism demonstrates accurate results in terms of shear force distribution on the rotational surface at the state of limit equilibrium. The effects of geotechnical and geometrical parameters (c', phi' and T-m) on the face stability of circular tunnels were also discussed.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Mingju Zhang, Qiguang Di, Pengfei Li, Yingjie Wei, Fan Wang
Summary: This paper analyzes the influence of non-associated flow rule on the face stability of a circular tunnel in cohesive-frictional soils through three-dimensional numerical simulations, and proposes a new three-dimensional failure mechanism. The results show that the presented model is more effective in analyzing the face stability of tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Zhenyu Sun, Dingli Zhang, Ao Li, Song Lu, Qimin Tai, Zhaofei Chu
Summary: This study investigates the evolution mechanism of tunnel face instability under different ground conditions through model tests and numerical simulations. The effects of various parameters on face stability are examined, providing valuable insights for evaluating face stability and safety control during tunnel excavation.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Civil
Ping Lu, Dajun Yuan, Jian Chen, Dalong Jin, Jun Wu, Weiping Luo
Summary: This study investigates the face stability of slurry shield tunnels in rock-soil interface mixed ground. A new apparatus was developed to simulate pressurized slurry supporting the tunnel face in centrifuge tests. The limit support pressure for slurry shield tunnels in RSI mixed ground was calculated and verified through numerical and sensitivity analysis.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Junhao Zhong, Chuantan Hou, Xiaoli Yang
Summary: In this work, the Piecewise Linear Method (PLM) is introduced to accurately predict the required face pressure for rock tunnels excavated in Hoek-Brown media. The study compares and analyzes the Generalized Tangential Technique (GTT) and Equivalent Mohr-Coulomb parameters Method (EMM) for linearized measurements. The required face pressure is formulated as an optimization problem depending on 2n variables and is solved using the Marine Predators Algorithm (MPA). The results show that the 3D analysis using PLM improves the prediction of face pressure compared to GTT, and EMM provides consistent results with PLM and GTT for heavily fractured rock mass.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Pengfei Li, Xiaopu Cui, Junwei Xia, Xinyu Wang
Summary: This paper focuses on theoretical analytical models to calculate the limit support pressure and vertical earth pressure on the cutting face for tunnels. The failure zone is divided into two parts, and the limit support pressure calculation equation is derived. The rationality of the theoretical model is verified through comparison with existing theory, numerical simulation, and centrifugal test.
Article
Computer Science, Interdisciplinary Applications
Gaoqiao Wu, Heng Zhao, Minghua Zhao, Zhiren Zhu
Summary: The undrained stability of dual circular tunnels buried in spatially random soils was analyzed using the random adaptive finite element limit analysis (RAFELA). The study focused on quantifying the influence of geometry parameters and spatial variability parameters on the bearing capacity and failure probability of tunnels, based on a lognormal distribution of undrained shear strength within a spatial correlation structure. The results revealed various failure patterns and showed how tunnel stability evolves with changes in tunnel geometry and soil spatial variability.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Green & Sustainable Science & Technology
Yaliang Niu, Tielun Ren, Qiang Zhou, Xueyang Jiao, Jiuqiang Shi, Ke Xiang, Jin Tao, Qian Zhai, Alfrendo Satyanaga
Summary: This study investigates the face stability of small curvature shield tunnels during excavation and its relationship with various excavation parameters. The results show that the excavation parameters significantly affect face stability. The findings can be used to optimize the performance of small curvature shield tunnels and support their continued development in urban areas.
Article
Construction & Building Technology
Jagdish Prasad Sahoo, Bibhash Kumar
Summary: This study obtained solutions for evaluating the minimum support pressure for maintaining peripheral stability of circular tunnels in clay, considering anisotropic undrained shear strength parameters. The finite element method and second order cone programming technique were used, showing that the anisotropic shear strength of clay significantly influences the required support pressure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Geological
Jianhong Man, Mingliang Zhou, Dongming Zhang, Hongwei Huang, Jiayao Chen
Summary: This paper presents a 2D analytical model for estimating the face stability of a rock tunnel in the presence of stratified rock masses. The results indicate that the thickness of the rock layer, tunnel diameter, and arrangement sequence of weak and strong rock layers significantly affect the tunnel face stability.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Xuanyang Zhang, Miao Yu, Jiaxin Liang, Chao Yang, Wei Liu
Summary: For rectangular section tunnel construction, the fluctuation of soil bin pressure under biaxial emergence conditions poses difficulties in uniform distribution of support pressure, leading to potential instability of the tunneling face. The Silo-wedge model is employed to horizontally split unstable soil sections, and the strength discounting method is introduced for ultimate equilibrium analysis. The field application of a box tunnel project in Suzhou demonstrates the practical engineering applicability of the research results.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Fei Zhang, Guangyu Dai, Yufeng Gao, Jie Bian
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2020)
Article
Computer Science, Interdisciplinary Applications
Jian Ji, Weijie Zhang, Fei Zhang, Yufeng Gao, Qing Lu
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Geological
Shangchuan Yang, Yufeng Gao, Ben Leshchinsky, Kai Cui, Fei Zhang
GEOTEXTILES AND GEOMEMBRANES
(2020)
Article
Engineering, Geological
Shangchuan Yang, Yufeng Gao, Kai Cui, Fei Zhang, Di Wu
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
Article
Engineering, Geological
Shangchuan Yang, Ben Leshchinsky, Kai Cui, Fei Zhang, Yufeng Gao
Summary: This study uses upper-bound kinematic limit analysis to determine the mechanism of failure and bearing capacity factors for shallow foundations near slopes subject to seismic action. The seismic bearing capacity factors are influenced by transitions in failure mechanism, soil properties, and finite configurations of slope and footing geometry, demonstrating significant non-linearity.
Article
Engineering, Civil
Zhou Zheng, Gao Yufeng, Zhang Fei, Song Jian, Zou Degao
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
(2020)
Article
Engineering, Geological
G. H. Lei, F. X. Liu, F. Zhang
ENGINEERING GEOLOGY
(2020)
Article
Engineering, Geological
YuFeng Gao, Lei Hang, Jia He, Fei Zhang, Leon Van Paassen
Summary: The BG system, which combines biocementation with geosynthetic materials, effectively increases pullout resistance compared to the OG system in laboratory tests. This innovative concept shows improved performance in enhancing the pullout resistance of geosynthetic reinforcements.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Engineering, Marine
Binpeng Zhou, Bin Li, Fei Zhang, Siguo Liu, Yizheng Li
Summary: A vibration test was conducted on large-diameter steel cylinders surrounding the artificial islands of the Hong Kong-Zhuhai-Macau Bridge, with results showing that the components experienced normal performance during vibration, providing important reference for design and safety evaluation.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Shangchuan Yang, Wei Ci, Ben Leshchinsky, Kai Cui, Fei Zhang
Summary: The study investigates the scale effects of rectangular footings near slopes, finding that ignoring scale effects may lead to overly conservative design for bearing capacity. It also concludes that footing shape influences the observed failure mechanism, and a larger internal friction angle can amplify the observed bearing capacity scale effects.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Fei Zhang, Yuming Zhu, Yanbo Chen, Shangchuan Yang
Summary: Current design methods for GRS walls often lead to insufficient reinforcement loads required for seismic stability due to pseudo-static analyses. This study aims to calculate the distribution of reinforcement loads and connection strength for each layer of seismic GRS walls, and conducts parametric studies to investigate seismic impacts on stability and lateral deformation.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Di Wu, Yuke Wang, Fei Zhang, Yue Qiu
Summary: The study developed a three-dimensional limit analysis method for evaluating slope stability considering pore-water pressures using the pore-water pressure coefficient. By comparing the linear and nonlinear strength envelopes, the study found that linear Mohr-Coulomb envelope overestimates the critical height of slopes under pore-water pressures. Results also showed that as the pore-water pressure coefficient increases, the critical slip surfaces of gentle slopes with nonlinear strength criteria become shallower.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Bin Ge, Huaining Ruan, Shuang Shu, Fei Zhang, Yufeng Gao
Summary: This study conducts a pseudo-static analysis based on limit equilibrium theory to calculate the distribution of required tension in geosynthetic-reinforced soil (GRS) walls under seismic conditions. The effects of various factors on the seismic stability of GRS walls are investigated. The results show that seismic acceleration amplification leads to increased reinforcement tension, particularly in the lower layers of the wall. Lengthening the bottom reinforcement layers can help reduce the required tension and mitigate the risk of reinforcement failure.
GEOTEXTILES AND GEOMEMBRANES
(2022)
Article
Engineering, Civil
Guangyu Dai, Fei Zhang, Yuke Wang
Summary: This study presents stability analyses of layered soil slopes in unsaturated conditions and determines the factor of safety involving suction stress of unsaturated soil using a limit equilibrium method. The obtained results show that larger suction stress provided in unsaturated clay dominates the stability of the layered slopes, while the location and thickness of the clay layer have significant influences on slope stability.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
Zhang Fei, Jia Shi-lin, Zhu Yu-ming, Lu Xiao-yi, Shu Shuang
Summary: Stability analyses of reinforced multi-tiered walls were conducted based on the limit equilibrium method to calculate the required strength of geosynthetics. The distribution of required strength and connection strength to the facing for each layer can help avoid composite failures due to insufficient reinforcement length, and connection strength should suddenly increase at the step. The critical offset distance and reinforcement tensile strength distribution are consistent with FHWA recommendations, conservatively estimating wall stability.
ROCK AND SOIL MECHANICS
(2021)
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)
