图珲公路高填方涵洞地基承载力分析

为了研究涵侧填土对高填方涵洞地基承载力的提高效应,由几何和动力相似条件设计了高填方涵洞地基承载力模型试验,模拟了不同涵侧填土高度的涵洞地基受荷,直到破坏。为了确定涵侧填土对高填方涵洞地基承载力的提高作用,根据相似原理设计了高填方涵洞模型试验,模拟了不同涵侧填土高时涵洞地基受荷破坏的过程,绘制荷载-沉降曲线得到极限荷载。讨论了使用经验公式和《公路桥涵地基与基础设计规范》的计算结果和试验结果的差值。选取图们至珲春高速公路桩号为RK365+510处的高填方涵洞作为试验涵洞,在涵洞底部埋设沉降观测点,测量基底沉降值和沉降差。结果表明:侧填荷载对地基承载力的提高十分显著,且提高幅度为非线性,先从18.4%增加到36.83%,然后减小到8.91%;计算地基承载力时应考虑公式和计算参数的选择以及试验方法对力学指标的影响;现场测试的涵洞基底最大沉降值符合规范的要求。

Analysis of foundation bearing capacity of high-stacked culverts in Tumen-Hunchun highway

To find the improved effect of lateral fill on the foundation bearing capacity of high-stacked culvert, based on the similar principle, high-stacked culvert foundation model tests were designed to simulate the culvert foundation deformation process under different lateral fill heights. The pressure-settlement curves were drawn and the foundation ultimate bearing capacities were measured by the curves. Meanwhile the errors among the calculated results with Code for Design of Ground Base and Foundation of Highway Bridges and Culverts, the empirical formula and the measured results were calculated. The settlement observation points were buried in the bottom of high-stacked test culvert located in pile number RK365 510 in Tumen-Hunchun highway to measure the basement settlement. The results show that the bearing capacity significantly increases with increasing of lateral fill height, but the growth is nonlinear. It firstly increases from 18.4% to 36.83% and then reduces to 8.91%. Not only the selected formula but also the impact of parameters provided by different test methods will be considered to calculate the foundation bearing capacity. The basement maximum settlement of the test culvert meets the requirement of the code.