基坑支护位移对土压力的影响

Influence of Foundation Pit Displacement on Earth Pressure

基坑支护设计中,准确计算土压力是保障基坑支护安全的前提。而经典朗肯极限土压力计算,其支护结构所对应的极限位移值往往较大,超过了基坑工程实际所允许的最大位移量,故而采用极限土压力有一定的局限性。通过采用横向受荷载桩的P-y曲线进行推导,并假设支护结构的位移按倒三角形分布,得到简化的位移土压力计算方法。通过与工程实际监测数据的对比分析,该计算方法能更准确的分析基坑支护土压力,具有一定的工程实践意义。

In the design of foundation pit support,accurate calculation of earth pressure is the prerequisite to ensure the safety of foundation pit support. The ultimate displacement value of the support system is often larger than that of the actual displacement of the foundation pit engineering. Therefore,the limit earth pressure has some limitations. A simplified displacement earth pressure gauge method is obtained by using the P-y curve of the transverse load-bearing pile,and the displacement of the support structure is assumed to be triangular. Through the comparison and analysis of the actual monitoring data,the calculation can be more accurate analysis of the foundation pit support soil pressure,has a certain engineering practical significance.