降雨入渗条件下兰溪市某防洪古城墙稳定性分析

基于ABAQUS有限元软件,建立了兰溪市某防洪古城墙渗流边坡稳定分析模型,采用渗流应力耦合计算方法模拟了在降雨入渗条件下古城墙边坡孔隙水压力变化过程,并比较分析了有防渗设施、有排水设施和无排水设施对墙后土体渗流特性和古城墙稳定性的影响。结果表明:在降雨入渗条件下,有防渗设施和无排水设施的古城墙边坡土体的孔隙水压力不断增大,倾覆力矩也不断增大,不利于古城墙的稳定；有排水设施的古城墙边坡土体的孔隙水压力通过排水通道得到了大幅度的降低,倾覆力矩也随之减小,更有利于古城墙的稳定。

Stability analysis of an ancient city wall for flood protection in Lanxi under rainfall infiltration

A seepage slope stability analysis model for an ancient city wall for flood protection in Lanxi was constructed based on the finite element software ABAQUS. A seepage-stress coupling calculation method was used to simulate the variation process of pore water pressure in the soil behind the ancient city wall under the condition of rainfall infiltration, and the seepage and deformation characteristics of the ancient city wall with anti-seepage facilities, drainage facilities and no drainage facilities were compared and analyzed.The study results show that under the condition of rainfall infiltration, the pore water pressure and overturning moment of the soil slope of the ancient city wall with anti-seepage facilities or no drainage facilities can be increased, which is not conducive to the stability of the ancient city wall. The pore water pressure of the soil slope inside the ancient city wall with drainage facilities is greatly decreased through the drainage channel, and the overturning moment is also reduced, which is more conducive to the stability of the ancient city wall.