强降雨作用下基坑的稳定性研究

Study on the Stability of Foundation Excavation Under Strong Rainfall

以北京遥科学探测实验室基坑工程为背景,针对北京百年一遇特大暴雨作用下的土质基坑大变形问题,本文采用数值模拟和现场监测相结合的方法对强降雨条件下的基坑稳定性进行了系统研究,运用FLAC3D数值模拟软件分析了无支护与设计支护状态下的基坑边坡水平位移的演化规律;同时采用现场监测的方法记录了基坑变形的基础数据。针对基坑在强降雨情况下发生的较大位移做出分析,提出该特殊条件下深基坑的稳定控制措施,确定了合理的基坑加固方式。

Based on the background of foundation excavation engineering of Beijing Yao-scientist detection lab,in order to solve the large soil foundation excavation deformation problem under the action of Beijing once-in-a-century heavy rainfall,this paper had been carried on system research with methods of numerical simulation and field measurement. With the simulation software FLAC3 D,it is analyzed the evolution law of the horizontal displacement of foundation excavation under the condition of no support and designed support. The basic data of the deformation of foundation excavation after supporting is also recorded by means of field monitoring. The paper analyzes the reason of large displacement happened in foundation excavation under the condition of heavy rainfall. The control measures to the stability of deep foundation excavation are carried out under this special condition and the proper reinforcement means are determined.