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張發財¹，邵 雙²，盧 軍¹，趙 凱¹，易明祥¹

（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：為了研究相鄰地鐵基坑開挖過程中的變形特征，本文以北京地鐵3號線基坑工程為研究對象，利用Rocscience phase2有限元軟件對基坑開挖過程進行數值模擬，并將模擬結果與現場監測數據進行對比分析，探究開挖過程中不同基坑間距對地連墻水平位移、坑外及坑間地表沉降和坑底隆起的影響。研究結果表明：地連墻水平位移近似為“凸肚”形和“弓”字形，隨著基坑間距的增大，相鄰基坑外側地連墻水平位移逐漸減小，內側地連墻水平位移逐漸增大；地表沉降整體呈“凹槽”形，坑間地表沉降值隨基坑間距的增大而減小，受相鄰基坑開挖疊加效應的影響，坑間地表最大沉降值約為兩側的1.2~1.5倍；坑底隆起表現為中間大、兩邊小的“帽”形，且受基坑間距變化的影響較小。

關鍵詞：相鄰基坑；基坑間距；變形特性；數值模擬

中圖分類號：TU41  

文獻標志碼：A       

文章編號：1005-8249（2024）02-0051-07

DOI：10.19860/j.cnki.issn1005-8249.2024.02.010

 

ZHANG Facai1，SHAO Shuang2，LU jun1，ZHAO Kai1，YI Mingxiang1

(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)

Abstracts：In order to study the deformation characteristics of the excavation of adjacent subway foundation pits,based on the foundation pit project of Beijing Metro Line 3, the study uses Rocscience phase2 finite element software to simulate the excavation and support process of the foundation pit, compares simulation results with on-site monitoring dates and explores the effects of different pit bottom.The results show that the horizontal displacement of the ground connecting wall is approximately “convex belly type”and “bow type”. With the increase of the pit spacing,the horizontal displacement of the lateral ground connecting wall decreases gradually,and the horizontal displacement of the inner ground connecting wall increases gradually.The overall surface settlement is "groove type", and the surface settlement value between pits decreases with the increase of pit spacing. Affected by the superposition effect of adjacent pit excavation, the maximum surface settlement value between pits is about 1.2~1.5 times that of both sides. The uplift of pit bottom is a "cap shape" with large center and small sides, and is less affected by the change of pit spacing.

Keywords：adjacent foundation pits;pit spacing;deformation characteristics; numerical simulation

基金項目：北京市自然科學基金面上項目（8202033）。

作者簡介：張發財（1984-），男，碩士，高級工程師，主要研究方向：城市地下工程施工及研究。

通信作者：邵雙（1998-），男，碩士研究生，主要研究方向：巖土工程。

收稿日期：2023-07-29