Hydraulic barrier function of the underground continuous concrete wall in the pit of subway station and its optimization |
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Authors: | Jianxiu Wang Lisheng Hu Lingao Wu Yiqun Tang Yanfei Zhu and Ping Yang |
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Institution: | (1) Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, 200092 Shanghai, China;(2) Department of Geotechnical Engineering, Tongji University, 200092 Shanghai, China;(3) Shanghai Tunnel Engineering Corporation Ltd, 200082 Shanghai, China |
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Abstract: | Subway traffic is now being developed in China on a large scale and the planning subway stations are often located in dense
district with tall building. The dewatering of confined aquifer may cause ground settlement, the cracking, deformation and
tilting of the building, and even collapse. Combing with the dewatering project of environment protection of the pit of Yishan
Road station of Shanghai subway No. 9, through the inversion of seepage parameters based on the field pumping test, the hydraulic
barrier function of the underground continuous wall is simulated. The result indicates that with the reduction of the exposed
length of the filter tube and the increase of that enclosed, the drawdown of the confined aquifer decreases. Especially with
the increase of the enclosed length of the filter tube, the drawdown outside the pit can be controlled effectively. According
to the result of the numerical simulation, the design of the continuous concrete wall of the pit for Shanghai Subway No. 9
is altered and the depth of the continuous concrete wall of the standing part and that in the end well are increased to 61
and 62 m, respectively. The monitored result of the equal drawdown pumping test indicates that the drawdown outside the pit
with a distance of 1–6 m to the wall is less than 2 m; It means that there is nearly no influence on the environment around
the pit during dewatering. |
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Keywords: | Dewatering of the deep pit Environmental protection Underground continuous concrete wall Hydraulic barrier function Numerical simulation of seepage |
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