小平面基坑计算数据与实际监测数据的对比及差异分析

Comparison & Difference Analysis between Calculation Data & Actual Monitoring Data of Small Plane Foundation Pit

将陇西排水系统工程中的第三方顶管基坑监测数据与常用基坑计算软件同济启明星FRWS8.1.16561中的计算结果进行对比分析。验证现有设计计算的准确性,分析部分计算结果与实测结果产生差异的原因,提出在基坑施工过程中,当监测结果超出报警值时根据监测数据对基坑计算内容进行反分析,调整计算参数后重新验证基坑承载力与稳定性及变形是否满足要求。探讨小平面基坑在尺寸效应下的变形与大基坑变形计算时的差别,并提出小平面基坑沉降预测值与计算值之间的折减关系。

The third-party pipe jacking pit monitoring data in Longxi drainage system project is compared with the calculation results in the common foundation pit calculation software Tongji Qiming Star FRWS8.1.16561.To verify the accuracy of the existing design calculation, analyze the reasons for the difference between some calculation results and the measured results, and put forward that when the monitoring results exceed the alarm value in the process of foundation pit construction,the calculation content of foundation pit should be back-analyzed according to the monitoring data, and the bearing capacity and stability and deformation of foundation pit should be re-verified after adjusting the calculation parameters. Discusses the difference between the deformation of small plane foundation pit under size effect and that of large foundation pit, and puts forward the reduction relationship between the settlement prediction value and the calculation value of small plane foundation pit.