非对称地表荷载作用下基坑支护结构现场监测及优化控制分析

Field Monitoring and Optimal Control Analysis of Foundation Pit Support Structure Under Asymmetric Surface Load

本文重点研究了深基坑支护体系在偏心荷载作用下的非对称变形问题,研究时共采取两种监测方式,(1)数值模拟;(2)实地监测。依托某基坑工程施工实践,科学分析了深基坑支护体系在偏心荷载作用下的非对称变形情况,提出了有针对性解决措施。经实地监测发现,在偏心荷载作用下深基坑支护体系向偏压方向倾斜,同时出现体系变形、扭转。经数值模拟发现,基坑内土体可以约束控制支护体系变形,土体补强,降低支护体系变形,降低了35.8%,显著控制了体系扭转,减少了沉陷量,降低率为79%。

This paper focuses on the asymmetric deformation of deep foundation pit support system under eccentric load.There are two monitoring methods:(1)numerical simulation;(2)Field monitoring.Based on the construction practice of a foundation pit,this paper scientifically analyzes the asymmetric deformation of the deep foundation pit support system under eccentric load,and puts forward targeted solutions.Through field monitoring,it is found that under the action of eccentric load,the support system of deep foundation pit tilts to the bias direction,and the system deformation and torsion occur at the same time.Through numerical simulation,it is found that the soil in the foundation pit can restrict and control the deformation of the support system,strengthen the soil,reduce the deformation of the support system,reduce 35.8%,significantly control the torsion of the system,reduce the settlement,and the reduction rate is 79%.