钢支撑对盾构竖井深基坑围护桩体变形规律的影响  

Influence of Steel Supporting on Deformation of Deep Pit Pile Structures in Shield Well

作　　者：李涛[1] 王昕鹏[1] 陈慧娴[1] 杨成淳[2] 黄佩格[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]北京首都国际机场股份有限公司,北京100621

出　　处：《河南科技大学学报（自然科学版）》2015年第2期74-77,82,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51274209);中央高校基本科研业务费专项基金项目(2009QL02);北京高等学校青年英才计划基金项目(YETP0944)

摘　　要：盾构竖井深基坑围护结构体系的稳定对保证盾构施工的安全至关重要。以北京地铁10号线某盾构井深基坑工程为例,通过数值模拟,分析支撑轴力和桩体水平位移的相互作用机理,并与现场监测结果进行对比。研究结果表明:基坑钢支撑的轴力均在安装完后不久达到最大值,然后减小并逐渐趋于稳定,最大位置发生在角撑;钢支撑对桩体水平位移的发展有一定的限制作用,桩体最大水平位移的位置随基坑开挖逐渐下移。The stabilization of supporting structure system in deep shield shaft foundation pit is crucial to ensure the safety of shield construction. Taking a deep pit engineering of Beijing subway line 10 as example,the interaction mechanism between the steel support axial force and the horizontal displacement of pile was analyzed by means of numerical simulation and the field monitoring. The results show that the steel support axial force reaches maximum soon after being installed,then gradually decreases and tends to be stable. The maximum value of the steel support axial force is in corner brace. The steel support limits the development of the horizontal displacement of pile to some extent. The maximum horizontal displacement point falls gradually with the foundation pit excavation.

关 键 词：深基坑 围护结构 现场监测 数值模拟 

分 类 号：TU432[建筑科学—岩土工程]