摘要
通过对基坑反演方法的分析,认为三次样条法反演基坑支护结构内力取得了一定的成功经验,但由于监测手段和监测仪器等因素的影响,作为反演依据的水平位移存在一定的误差,且在反演过程中会逐步放大,造成反演结果的不可信。在三次样条法的基础上,通过试算法消除位移测量误差对反演结果的影响,推导出反演公式,运用Matlab软件作为试算工具,得出了可靠的反演结果,并将反演得到的弯矩再次反演,得到了桩后土压力的分布,所提出的方法具有广泛的适用性。
The study on back analysis for foundation pit considered that cubic spline that used in back analysis of force inside the pit bracing structure had got certain experience, however, due to influence of monitoring means and instruments, the horizontal displacement, as the basis of back analysis, had certain error which will increase gradually during the analysis, and lead to unreliable result. Based on the cubic spline, the impact of measuring error in displacement on back analysis result was removed by trial method, thus the back analysis formula derived. Taking Matlab software as the tool for trail method, the reliable result was obtained, then the bending moment obtained herein was applied to back analysis again to get the distribution of soil pressure behind piles. The method proposed herein has extensive applicability.
出处
《路基工程》
2015年第4期55-59,共5页
Subgrade Engineering
关键词
基坑反演
反分析
三次样条
MATLAB
试算法
back analysis for foundation pit
back analysis
cubic spline
Matlab
trial method
