[1]刘波,席培胜,章定文.偏压作用下非等深基坑开挖效应数值分析[J].东南大学学报(自然科学版),2016,46(4):853-859.[doi:10.3969/j.issn.1001-0505.2016.04.030]
 Liu Bo,Xi Peisheng,Zhang Dingwen.Numerical analysis of excavation effect of unsymmetrical loaded foundation pit with different excavation depths[J].Journal of Southeast University (Natural Science Edition),2016,46(4):853-859.[doi:10.3969/j.issn.1001-0505.2016.04.030]
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偏压作用下非等深基坑开挖效应数值分析()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
46
期数:
2016年第4期
页码:
853-859
栏目:
土木工程
出版日期:
2016-07-20

文章信息/Info

Title:
Numerical analysis of excavation effect of unsymmetrical loaded foundation pit with different excavation depths
作者:
刘波13席培胜3章定文12
1东南大学交通学院, 南京 210096; 2东南大学江苏省城市地下工程与环境安全重点实验室, 南京210096; 3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, 合肥230601
Author(s):
Liu Bo13 Xi Peisheng3 Zhang Dingwen12
1 School of Transportation, Southeast University, Nanjing 210096, China
2Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Southeast University, Nanjing 210096, China
3 State and Local Joint Engineering Laboratory of Structure Health Monitoring and Disaster Prevention, Anhui Jianzhu University, Hefei 230601, China
关键词:
偏压基坑 开挖深度 数值模拟 空间效应
Keywords:
unsymmetrical loaded foundation pit excavation depth numerical simulation spatial effect
分类号:
TU473.2
DOI:
10.3969/j.issn.1001-0505.2016.04.030
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:
A three-dimensional finite element model, which considers the stratified excavation and supporting, is adopted to investigate the excavation effects of the unsymmetrical loaded foundation pit with different excavation depths, and evaluate the reasonability of the supporting system design parameters. The results indicate that the diaphragm wall and inner supports have an obvious lateral displacement towards the opposite side of load at a certain depth due to the unsymmetrical load, which makes the deflection of upper supports be far less than that of middle-lower supports. The maximum wall deflection induced by three-story underground excavation is 3 times that induced by two-story underground excavation, and the maximum deflection both occurs near the bottom elevation. The bottom heave and the ground settlement show an obvious spatial effect, and the maximum bottom heave induced by three-story underground excavation is 2 times that induced by two-story underground excavation. The maximum outside ground settlement in the middle section of foundation pit is 1.4 times that at the corner of foundation pit. The supporting system design parameters adopted in this project can meet the requirements of the deformation control.

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备注/Memo

备注/Memo:
收稿日期: 2015-11-08.
作者简介: 刘波(1989—),男,博士生;章定文(联系人),男,博士,教授,博士生导师,zhangdw@seu.edu.cn.
基金项目: “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.
引用本文: 刘波,席培胜,章定文.偏压作用下非等深基坑开挖效应数值分析[J].东南大学学报(自然科学版),2016,46(4):853-859. DOI:10.3969/j.issn.1001-0505.2016.04.030.
更新日期/Last Update: 2016-07-20