高速铁路桥台台背土压力试验与空间土压力计算分析

高速铁路桥台台后填土从填料选择、施工控制、质量监测等方面均不同于常规铁路。结合试验工程对台背土压力进行研究,同时运用三维有限元程序进行模拟计算,并将计算结果与实测结果进行对比分析。现场测试结果表明,台背土压力大致呈“抛物线型”分布,与库仑土压力理论的线性分布不同。软土地基上桥台土压力存在一定的时间效应,填土结束后有一随时间增长而逐渐趋于稳定的过程,至最终稳定大致需要3个月时间。有限元分析结果表明,台背土压力分布存在一定的空间效应,在同一深度上数值并不相等,中间大,两侧小。用库仑公式计算的结果比数值计算与实测的结果偏于安全。

Earth Pressure Test and Spatial Calculation Analysis of Bridge Abutments of High-Speed Railway

Earth filling behind the abutment of high-speed railway is different from conventional railway in the selection of padding,construction control and quality supervision.Therefore,combining with experiment project,a long-term earth pressure test was carried out.At the same time,spatial effect was computed with three-dimensional finite element program and the computing results were compared with actual measurement results.The results of field test indicate that the earth pressure of abutment,different from linear distribution of Coulomb's, acts as parabolic type.Earth pressure distribution of abutment is time effect in soft soil area.It lasts for about three months for earth pressure to become stable.The results of finite element analysis reveal that the distribution of earth pressure is spatial effect;the pressure at middle position is larger than that at both sides.The computing results of Coulomb formula are safer than those of three-dimension finite program and actual measurement.