Research On Analyzing Of Deep Excavation Under Seepage Condition

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Bin, Li^1,2,3,4,5,6

Tianjin Port Engineering Institute Co., Ltd., CCCC First Harbor Engineering Co., Ltd., Tianjin

300222, China^1

Key Laboratory of Port Geotechnical Engineering, Ministry of Communications, Tianjin

300222, China^2

Key Laboratory of Tianjin Port Geotechnical Engineering, Tianjin

300222, China^3

CCCC First Harbor Engineering Company Ltd., Tianjin

300461, China^4

China Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam, Ministry of Water Resources, Nanjing

210029, China^5

Guangxi Key Laboratory of Geomechanics, Geotechnical Engineering Guilin University of Technology, Guilin

541000, China^6

关键词: Construction progress;    Finite element simulations;    Finite element software;    Geological conditions;    Lateral displacements;    Pore-water pressures;    Surrounding environment;    Underground diaphragm wall;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/5/052022/pdf
DOI  :  10.1088/1755-1315/189/5/052022

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The round excavation with high groundwater level is near to a building. The safety of excavation needs to take into account the geological conditions, the influence of groundwater level and the surrounding environment; combined with the excavation monitoring example, the finite element software is used to simulate the influence of seepage and the stability of the adjacent building, and the simulation results are used to guide the layout of the monitoring points and the optimization of the monitoring scheme; the simulation results show that the effective stress value increases when considering the seepage effect. A 19mm lateral displacement will occur at the top of the underground diaphragm wall adjacent to the building, and a 59mm settlement will occur at a distance of 10m from the top of an underground diaphragm wall. The pore water pressure of the soil will gradually dissipate as the construction progresses; the difference between monitoring results and calculation results is small. The finite element simulation considering the seepage effect can well simulate the excavation with high groundwater leve. It is suggested that the effective stress caused by the seepage flow should be consider when the excavation with high groundwater level.