上海某深基坑围护结构深层水平位移测试及分析

The Deep Horizontal Displacement Test and Analysis About Undisturbed Structure of One Deep Pit in Shanghai

深基坑土方开挖过程中,由于外侧水土压力作用,围护结构向坑内产生水平位移,当围护结构水平位移过大时,整个支护体系会产生失稳或破坏。深基坑围护结构深层水平位移测试尤为重要。对上海地区某深基坑围护结构深层水平位移测试成果进行了分析,包括开挖各工况围护位移速率、时间效应影响、不同围护边位移差异原因及监测末期实测最大位移与计算值的比较等,并提出控制其变形的相关措施。

In the deep foundation excavation process, , the undisturbed structure will produce the horizontal displacement for the pit due to lateral soil pressure , when the undisturbed horizontal displacement is too large, the whole supporting system will be instability or destruction, so the deep horizontal displacement testing of the deep foundation pit structure is particularly important. In this paper, it is analyzed that the horizontal displacement testing results of a deep foundation in shanghai, which include the displacement rate, the time effect of different excavation conditions, the different displacement reasons in the undisturbed edges and the comparison between the maximum displacement in end monitoring and the calculated displacement values , and in the end, it is proposed that some relevant measures to control this deformation.