摘要:
针对膨胀土路堑边坡增湿破坏现象,以含水率为主要参数来开展其稳定性的研究。首先开展膨胀土膨胀变形试验与抗剪强度试验研究,得到了膨胀土土性参数随含水率的变化规律,然后在正确考虑到地质构造影响的基础上运用有限差分法对坡体进行数值建模和计算分析,并对膨胀土路堑边坡的各种增湿状态进行仿真模拟,编制的分析程序自动实现膨胀土各种土性参数随含水率的同步变化,最后利用强度折减法计算得到了膨胀土路堑边坡稳定性安全系数的变化规律。分析发现,膨胀土路堑边坡稳定性主要是由地质构造和含水率因素共同控制的,在不同的增湿状态下二者对边坡的稳定性有着不同的影响程度。
Abstract:
As for landslides of cutting slopes in expansive soils owing to increasing water,the water content was taken into consideration to solve the problems.At first,two kinds of soil experiments were made,that is,expansive deformation experiment and shear strength experiment,and the variations of parameters of expansive soil property with the water content were generated.Then considering the proper geologic factors,a numerical model of cutting slopes was established by means of finite difference method,and the slope stability under different water-increased conditions was analyzed while all kinds of soil property parameters and water content varied synchronously.Finally,the safety factors of cutting slopes in expansive soil were gained by strength reduction method.According to the above analysis,it was shown that the stability of the slope was controlled by geology and water content.
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