圆砾地层深基坑坑角效应对邻近建筑物变形的影响
魏建发1周颖1田发派2马少坤2,3,4黄震2
Influence of Corner Effect in Cobble Stratum Deep Foundation Pit on Deformation of Adjacent Buildings
WEI Jianfa1ZHOU Ying1TIAN Fapai2MA Shaokun2,3,4HUANG Zhen2
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作者信息:1.中国中铁一局集团有限公司第三工程分公司， 721003， 宝鸡
2.广西大学土木建筑工程学院， 530004， 南宁
3.广西大学工程防灾与结构安全教育部重点实验室， 530004， 南宁
4.广西防灾减灾与工程安全重点实验室， 530004， 南宁
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Affiliation:1.China Railway First Group Third Engineering Co., Ltd., 721003, Baoji, China
2.School of Civil Engineering and Architecture, Guangxi University, 530004, Nanning, China
3.Guangxi Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, 530004, Nanning, China
4.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, 530004, Nanning, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.02.022
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中图分类号/CLCN:TU433
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栏目/Col:研究报告
摘要:
［目的］在基坑坑角效应影响下，坑角处的围护结构变形差异显著，建筑物沿基坑各方向会产生不同的沉降值，坑角效应对圆砾地层的影响尤为显著，极易造成建筑物破坏。因此，需研究圆砾地层深基坑坑角效应对邻近建筑物变形的影响规律。［方法］以南宁轨道交通5号线广西大学站为例，通过分析实际监测数据获得车站深基坑坑角效应的影响范围；采用Plaxis软件建立三维有限元计算模型，分析坑角影响范围内的地连墙和邻近建筑物的变形规律。［结果及结论］圆砾地层的坑角效应范围为2.8H(H为基坑开挖深度)，坑角效应将导致基坑中部的地连墙最大水平位移较坑角处大，最大增加幅度为82.2%。当建筑物与坑角距离≥1.5H时，坑角效应对建筑物的变形约束作用有所减弱。随着建筑物与坑角及坑边距离的变化，在垂直于基坑边的方向上，建筑物纵墙的不均匀沉降值、倾斜率变化曲线均呈现出陡降式的抛物线变化趋势；在平行于基坑边的方向上，建筑物横墙的不均匀沉降值、倾斜率曲线的变化可划分为陡降式、上凸式、下凹式抛物线变化趋势。
Abstracts:
［Objective］ Under the influence of corner effect in deep foundation pit, significant differences in deformation occur in the retaining structure at the pit corners. Buildings along various directions of the foundation pit experience varying settlement values. The corner effect is particularly pronounced in cobble stratum, posing a high risk of structural damage. Therefore, it is necessary to investigate the impact law of corner effect in deep foundation pit in cobble stratum on the deformation of adjacent buildings. ［Method］ Taking Guangxi University Station of Nanning Rail Transit Line 5 as example, the influence range of the corner effect is studied through the analysis of actual monitoring data. A three-dimensional finite element calculation model is established using Plaxis software to analyze the deformation law of the diaphragm wall and adjacent buildings within the corner effect range. ［Result & Conclusion］ The corner effect range in cobble stratum is determined to be 2.8H (H as the excavation depth). The corner effect results in significantly greater horizontal displacement of foundation pit mid-section diaphragm wall compared to the corner, with a maximum increase of 82.2%. When the distance between buildings and the pit corner is≥1.5H, the restraining action of pit corner effect on building deformation weakens. With variations in the distance between buildings and the pit corner or edge, the uneven settlement values and tilt rates of building longitudinal walls show a steep parabolic change trend in the vertical direction to the foundation pit edge, while in the parallel direction to the foundation pit edge, the curve changes of the uneven settlement and tilt rates of building longitudinal walls can be divided into a parabolic trend with steep decline, convex, and concave patterns.
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