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孟英杰¹ , 王維俊¹ , 李   猛¹ , 胡天龍¹ , 龍大愚²

( 1. 北京市政路橋股份有限公司 ，北京 100068 ; 2. 北京科技大學 土木與資源工程學院 ，北京 100083)

摘   要： 為了研究河流水位對深淺式地鐵基坑工程的影響 ，運用 RS3 有限元軟件中流固耦合計算模型 ，探 究了河流水位變化對深淺式基坑變形和受力的影響規律 。結果表明： 地連墻的水平位移和彎矩 、坑底隆起位移 和格構柱的豎向位移均隨河流水位的增加而增加； 坑邊地表沉降位移和基坑的穩定安全系數隨著河流水位的增 加而減小 。河流水位變化對格構柱的豎向位移影響較小； 而河流水位標高為 21 ~ 22 m 范圍時 ，對地連墻的水平 位移和彎矩 、坑邊地表沉降位移 、坑底隆起位移和基坑的穩定安全系數有較大的影響； 隨河流水位的增加 ，坑 邊地表沉降位移和坑底隆起位移的影響范圍均會向下部和臨河側的土體擴大 ，臨河側基坑淺部和圍護樁底的塑 性破壞區域也會增大。

關鍵詞： 臨河條件； 深淺式地鐵基坑； 河流水位； 有限元分析； 流固耦合

中圖分類號： TU463      

文獻標志碼： A      

文章編號： 1005-8249 (2024) 01-0093-08

DOI : 10. 19860/j.cnki.issn1005-8249.2024.01.01

 

MENG Yingjie¹ , WANG Weijun¹ , LI Meng¹ , HU Tianlong¹ , LONG Dayu²

( 1. Beijing Municipal Road Bridge Holding Group Co. ，Ltd. ，Beijing 100068 , China;

2. School of Civil and Resource Engineering , University of Science and Technology Beijing , Beijing 100083 ,  China)

Abstract:The paper aims to study the influence of river water level on deep and shallow subway foundation pit engineering. The fluid-solid coupling calculation model in RS3 finite element software was used to study the influence of river water level change on the deformation and stress of deep and shallow subway foundation pit. The results show that the horizontal displacement and bending moment of the diaphragm wall, uplift displacement of pit bottom and vertical displacement of the lattice column all increase with the increase of river water level. The ground surface settlement displacement and the stability safety factor of foundation pit decrease with the increase of river water level. The variation of river water level has little effect on vertical displacement of lattice columns. When the elevation of river water level is in the range of 21~22 m, it has great influence on the horizontal displacement and bending moment of the diaphragm wall, ground surface settlement displacement, the uplift displacement of pit bottom and the stability safety factor of foundation pit. With the increase of river water level, the influence range of ground surface settlement displacement and uplift displacement of pit bottom expand to the soil at the bottom of the pit and the river side, and the plastic failure area at the shallow part of the foundation pit and the bottom of the retaining pile will also increase.

Keywords:riverside conditions; deep and shallow subway foundation pit; stage of river; finite element analysis; fluid-solid coupling

 

?基金項目： 北京市自然科學基金面上項目  (8202033) 。

作者簡介： 孟英杰  (1989—) , 男 ，本科 ，工程師 ，主要研究方向： 城市地下工程與空間施工技術研究。 

通信作者： 龍大愚  (1994—) , 男 ，碩士 ，主要研究方向： 巖土工程研究。

收稿日期： 2023-09-05