Article
Mechanics
Yaxiong Liang, Shuaihua Ye, Yiguan Huang
Summary: This article establishes a three-dimensional finite-element model to simulate the construction of the deep foundation pit of Xiaoxihu station on Lanzhou subway Line 1. The analysis of various factors and comparison with actual monitoring data show that a properly designed retaining pile and inner support can effectively control the deformation of the foundation pit in collapsible loess strata in Lanzhou, ensuring its stability.
Article
Environmental Sciences
Qian Zhang, Jie Hu, Jing Wang, Peng He, Lili Hou, Peng Lin, Shuguang Song
Summary: The study found that in the design and construction of subway stations, the numerous effects of adjacent structures should be considered. The distribution and variation of soil pressure are greatly influenced by factors such as length-diameter ratio, excavation depth, internal friction angle, and friction between soil and retaining structure. The deformation of the foundation pit retaining structure has a significant influence on the distribution of soil pressure around it.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Environmental
Meng Han, Zhe Li, Jinqing Jia, Xiaohua Bao, Guoxiong Mei, Lulu Liu
Summary: This paper investigates the force system conversion mechanism of retaining structures for braced excavation in soft soil. Based on the measured data, the deformation characteristics of braced excavation in soft soil were analyzed, and the temperature correction model and prediction methods for strut force were established. The results provide important insights for the design and construction of subway excavation engineering.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Civil
Ma Chao, Lu Dechun, Du Xiuli, Qi Chengzhi
Summary: The seismic performance of subway stations is affected by the presence of earth retaining systems, particularly fender piles. The study found that the existence of fender piles can alter the deformation modes and damage patterns of stations, while earthquake intensity has opposite effects on stations with or without fender piles.
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
(2022)
Article
Construction & Building Technology
Xiangyu Guo, Zhengzheng Wang, Ping Geng, Changjian Chen, Jing Zhang
Summary: The pile-beam-arch method is a shallow tunneling method suitable for constructing urban subway stations, with the main construction process simplified into four stages. Numerical calculations were used to investigate the development law of ground surface settlement during construction, identifying pilot tunnel excavation and arch installation as key stages for controlling surface settlement. The study also found that the sequence of pilot tunnel excavation, column spacing, and cross-sectional area all have significant effects on surface settlement.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Environmental Sciences
Maoxin Su, Yimin Liu, Yiguo Xue, Lichao Nie, Peng Wang, Congcong Li, Xiaoyin Ma
Summary: This study used the Nanjing Shangyuanmen station water inrush accident as a case study and proposed a comprehensive detection system combining different geophysical methods to delineate water inrush hazards around a foundation pit.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Yousheng Deng, Chengpu Peng, Jialin Su, Lingtao Li, Liqing Meng, Long Li
Summary: The reliability of the supporting effect of moso bamboo piles as temporary supporting structures for shallow foundation pits was analyzed. A mathematical model and experiments were used to derive a reliability index formula and determine the impact of safety factor, tolerable limit displacement, and the ratio of ultimate limit displacement to tolerable displacement on the reliability index.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Jiaqi Lu, Huihuang Jiang
Summary: The study focused on reducing the impact of deep and large foundation pits on nearby subway tunnels by proposing a T-shaped pile support system. Through finite element software analysis, it was found that the T-shaped structure exhibited a central effect and can meet the requirements of pit excavation.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Zhen-Dong Cui, Long-Ji Zhang, Zhi-Xiang Zhan
Summary: Studying the seismic response of a shallowly buried subway station in an inhomogeneous site caused by soil consolidation is of great significance. A series of dynamic triaxial tests were conducted to investigate the dynamic characteristics of Shanghai soft clay under different confining pressures. Nonlinear analysis was used to explore the influence of the inhomogeneous clay site on the seismic response of the subway station. The research findings reveal that the damage to subway stations is more severe in the inhomogeneous clay site under the same seismic wave.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Yang Zhao, Hyungjoon Seo, Cheng Chen
Summary: In this study, 3-D laser scanning was utilized to monitor the displacement of a large-scale retaining structure, and displacement mapping was proposed to globally monitor the deformation. The results identified both local and global behaviors of the sheet pile, which were confirmed through site investigation. This method provides a complementary approach to existing monitoring techniques for evaluating the behavior of large-scale retaining structures during excavation.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2021)
Article
Construction & Building Technology
Jianbing Lv, Jianjun Lu, Jingkai Huang, Juan Huang, Jia Li
Summary: The underground hole pile excavation method causes large vertical displacement in a weak stratum, which affects the safety of structures. This study investigates the settlement law caused by the hole pile excavation method with different thicknesses of the weak stratum and evaluates the effect of reinforcement measures using the Metro Jet System (MJS). The results show that the MJS pile forming technology can effectively control the vertical settlement of the ground surface.
Article
Chemistry, Analytical
Chengyu Hong, Jinyang Zhang, Weibin Chen
Summary: An intelligent approach for monitoring and management of deep foundation pit in a subway station was proposed in this study, using the Waterlands Resort East Station Project as a validation case. The study involved the construction of a three-dimensional transparent geological model of the foundation pit, integration of multi-source sensing technologies for real-time high-precision wireless monitoring, development of machine learning models for predicting key parameters, and creation of a digital twin integrated platform for management. This research is expected to enhance the construction, maintenance, and management of foundation pits in subway stations.
Article
Geochemistry & Geophysics
Chuntao Feng, Zhihe Cheng, Lei Zhu
Summary: Based on a deep foundation pit in Changchun, a 3D numerical model of water-heat coupling was established to study the performance of a prestressed pile anchor system during freezing and thawing seasons in alpine areas. Field monitoring data confirmed the reliability of the model and showed changes in surface subsidence, anchor cable axial force, and pile horizontal displacement during spring thaw.
Article
Chemistry, Multidisciplinary
Zhenbo Zhang, Jiadi Zhou, Fei Xu, Zhichun Liu, Minglei Sun
Summary: The study aimed to predict the finite soil pressure for a new foundation pit adjacent to an existing subway station. Failure modes and formulas for calculating the finite soil pressure were derived. The rationality of the method was verified through example and model tests. The study analyzed the influences of parameters on the resultant force of the soil pressure and the relative height of the resultant force.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Yanbin Gao, Zhouxiang Ding
Summary: This study conducted a detailed case study on the post uplift phenomenon in a deep excavation in soft clay in Shanghai. The working characteristics of a long pile foundation under low safety factor against base heave were examined, and the influence of base treatment and excavation/construction procedures on post uplift was discussed.
