铁路路基桩筏基础承载力与沉降特性研究

Study on Bearing Capacity and Settlement Characteristics of Piled Raft Foundation of Railway Subgrade

为提高路基桩筏基础承载力与沉降特性分析的准确性,研究铁路路基桩筏基础承载力与沉降特性的分析方法。采用现场试验与模拟计算相结合的方法进行分析,试验使用了单点监测仪、液位监测仪及压力箱,同时设置远距离自动监测系统;通过基本假定,计算出桩筏的基础承载力与沉降特性,建立桩筏解析结构分析模型,分析不同荷载下桩筏基础的承载性能与沉降特性。试验结果表明:此次研究方法分析出的桩筏基础承载力与实际测量结果相差较小,相对误差可控制在100 kN以内,分析出的沉降量与实际沉降量相差仅为4 mm,提高了路基桩筏基础承载力与沉降特性分析的准确性。

In order to improve the accuracy of the bearing capacity and settlement characteristics analysis of the subgrade pile raft foundation,the analysis method of it is studied.The analysis is combined by site test and simulation calculation,using single-point monitor,liquid level monitor,pressure box and remote automatic monitoring system.Then the foundation bearing capacity and settlement characteristics of pile raft are calculated,the analytical structure analysis model is established,and analyzed the bearing performance and settlement characteristics of pile raft foundation under different loads.The experimental results show that the difference between the bearing capacity of the pile raft foundation and the actual measurement result is small,and the relative error can be controlled within 100 kN,and the difference between the analyzed settlement volume is only 4 mm,which improves the accuracy of the subgrade pile raft foundation bearing capacity and settlement characteristics analysis.