山碴石填料路基沉降数值模拟研究

Study on Numerical Simulation of Subgrade Settlement of Mountain Ballast Filling

考虑到山碴石在石料强度、含石量与常规土石方有所区别,其材质不均匀性及岩土体本构关系等问题,采用有限差分的方法对山碴石填料路基沉降计算模型进行分析.结果表明:不同深度处路基的竖向位移沿径向变化的规律基本相同;振动碾压作用下,沉降与径向距离呈负相关,且衰减速率呈先快后缓,越靠近振动碾压的部位,沉降值越大;山碴石路基分层碾压效果随分层数的增加越来越明显;随着土体弹性模量的增加,山碴石填料路基沉降量的下降幅度较大.

Considering the differences of stone material strength, stone content and conventional quantiy of earthwork, the non uniformity of material and the constitutive relation of rock and soil, the finite difference method is used to analyze the calculation model of subgrade settlement of ballast filling. The results show that the vertical displacement of the roadbed at different depths is basically the same as that of the radial displacement. Under vibration rolling, the settlement is negatively correlated with the radial distance, and the attenuation rate is first fast and then slows down. The closer the settlement is to the part of vibration rolling, the greater the settlement value is. The effect of layered roller compaction is more and more obvious with the increase of the number of layers. With the increase of soil elastic modulus, the settlement of sub-grade filled with ballast decreases greatly.