降雨条件下水泥改良强风化千枚岩路基填土适用性数值分析

Numerical Analysis of Applicability of Cement-modified Strongly Weathered Phyllite Subgrade Fill Under Rainfall Conditions

为研究水泥改良前后强风化千枚岩作为路基填土在降雨及荷载作用下的适用性,文中利用Geostudio有限元软件,对未改良及改良后路基土的无侧限抗压强度最优组合方案进行数值模拟分析,模拟路基经过降雨后的渗流、和车辆荷载与降雨同时作用后的变形,获得了改良前后千枚岩路基的渗流特征及沉降变形差异性。研究结果表明,改良后的强风化千枚岩作为路基填料时,在不同工况下较未改良千枚岩抗渗性能好、路基变形小。

In order to study the applicability of strongly weathered phyllite as subgrade fill before and after cement improvement under the action of rainfall and load,this paper uses Geostudio finite element software to carry out numerical simulation of the optimal horizontal combination of unconfined compressive strength of the unmodified and improved subgrade soil,simulating the seepage of the subgrade after rainfall,and the deformation of the subgrade after the simultaneous action of vehicle load and rainfall.The difference of seepage characteristics and settlement deformation of phyllite subgrade before and after improvement is obtained.The results show that the improved strongly weathered phyllite as subgrade filler has better impermeability and less subgrade deformation than the unmodified phyllite under different conditions.