偏压作用下非等深基坑开挖效应数值分析

发布时间：2018-03-01 19:16

本文关键词： 偏压基坑开挖深度数值模拟空间效应　出处：《东南大学学报(自然科学版)》2016年04期 　论文类型：期刊论文

【摘要】：采用考虑基坑分层开挖与支护的三维有限元计算模型,研究偏压非等深基坑的开挖效应,并评价基坑支护结构设计参数的合理性.分析结果表明:偏压荷载下,基坑上部一定深度内的围护墙和内支撑发生向非偏压侧的整体偏移,进而使得基坑上部支撑的挠度远小于中下部支撑.地下3层开挖引起的墙体向坑内侧移量是地下2层开挖引起的侧移量的3倍,且最大侧移均发生在各自坑底标高附近.坑底隆起和地表沉降表现出明显的空间效应,地下3层开挖引起坑底最大隆起值约为地下2层开挖引起坑底最大隆起值的2倍.基坑中间断面外侧地表最大沉降约为基坑角点处地表最大沉降的1.4倍.本工程采用的基坑支护体系设计参数可满足变形控制要求.
[Abstract]:The three-dimensional finite element model considering the layered excavation and supporting of foundation pit is used to study the excavation effect of non-equal-pressure deep foundation pit, and the rationality of the design parameters of foundation pit support structure is evaluated. In the upper part of the foundation pit, the retaining wall and the inner support deviate to the unbiased side of the retaining wall at a certain depth. The deflection of the upper support of the foundation pit is much smaller than that of the middle and lower part of the foundation pit, and the displacement of the wall to the inside of the pit caused by the excavation of the three layers underground is three times the amount of the lateral displacement caused by the excavation of the second layer of the foundation pit. The maximum lateral displacement occurred near the elevation of each pit bottom, and the uplift of the pit bottom and the surface subsidence showed obvious spatial effects. The maximum uplift of the pit bottom caused by the excavation of the three layers is about 2 times of the maximum uplift value of the bottom caused by the excavation of the second floor, and the maximum settlement of the surface outside the middle section of the foundation pit is about 1.4 times of the maximum settlement at the corner of the foundation pit. The design parameters of foundation pit support system can meet the requirements of deformation control.
【作者单位】：东南大学交通学院;安徽建筑大学建筑健康监测与灾害预防技术国家地方联合工程实验室;东南大学江苏省城市地下工程与环境安全重点实验室;
【基金】：“十二五”国家科技支撑计划资助项目(2012BAJ01B02) 中央高校基本科研业务费专项资金资助项目(2242014R30020) 江苏省高校“青蓝工程”优秀青年骨干教师培养对象资助项目
【分类号】：TU753

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