Experimental Study on Variation Mechanism of Water Level Caused by Dewatering of Foundation Pit of Subway Station in Typical Phreatic Layer in Shenzhen

被引：1
|
作者：
Yang Q. [1 ,2 ]
Zhao B. [1 ,2 ]
Sun F. [1 ,2 ]
Zhao T. [1 ,2 ]
机构：
[1] Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing
[2] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Zhao, Boming (bmzhao@bjtu.edu.cn) | 2018年 / Chinese Academy of Railway Sciences卷 / 39期
关键词：
Effective influence depth; Foundation pit of subway station; Model test; Partially penetrating well precipitation; Phreatic layer; Precipitation curve outside foundation pit;
D O I：
10.3969/j.issn.1001-4632.2018.05.04
中图分类号：
学科分类号：
摘要：
Based on the foundation pit engineering of a subway station in Shenzhen, the model tests of partially penetrating well precipitation of foundation pit were carried out. Results show that, in the case of the same precipitation conditions, due to the influence of by-pass seepage, the effective influence depth inside foundation pit is greater than that outside foundation pit. Due to the influence of well group effect, the effective influence depth of two wells inside foundation pit is greater than that of single well. Within the depth range of diaphragm wall, the variation of pore water pressure in the outer soil layer of foundation pit increases with the increase of depth, and the precipitation of partially penetrating well inside foundation pit leads to the precipitation curve outside foundation pit showing a type of "first concave and then convex". Based on the theoretical calculation formula by Babushkin for the water inflow in the phreatic layer of fully penetrating well and partially penetrating well, the calculation formula for the effective influence depth of partially penetrating well precipitation is derived. Based on model test data, the equation of precipitation curve outside foundation pit is obtained through curve fitting. Taking the actual foundation pit engineering as the case, the effective influence depth of partially penetrating well precipitation inside foundation pit and the precipitation curve outside foundation pit obtained by theoretical calculation formulas are compared with the results of numerical simulation. It is found that the error of effective influence depth is relatively small and the precipitation curve is basically consistent, which has verified the correctness and rationality of the theoretical calculation formulas. © 2018, Editorial Department of China Railway Science. All right reserved.
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页码：22 / 32
页数：10
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