考虑水致劣化效应的库岸滑坡非饱和渗流应力耦合分析

Unsaturated seepage and stress coupling of reservoir landslides considering the water-induced deterioration effect

水对岩土体的力学参数存在明显的劣化效应。开展了不同含水率条件下滑坡堆积体三轴力学试验,建立了饱和度和力学参数之间的经验方程;对建立的经验方程进行了二次开发,通过饱和度和力学参数的耦合,实现了库水位实时变动过程中考虑岩土体力学参数变化对滑坡稳定性的影响,克服了库水位变动过程中岩土体物理力学参数不能随库水入渗变化的局限性。通过云南省兰坪县大华滑坡在库水位变动环境下的模拟结果和现场监测数据的比对,验证了考虑岩土体力学参数水致劣化效应的合理性,并对大华滑坡考虑水致劣化效应的变形演化规律进行了工程应用。

Water has an obvious degrading effect on the mechanical parameters of rock and soil.In this paper,triaxial tests of landslide deposits under different water content conditions were carried out,and empirical equations between saturation and mechanical parameters were established.Besides,secondary development on the established empirical equation was also carried out.Based the coupling of saturation and mechanical parameters,the influence of sliding body mechanical parameter changes on the landslide stability can then be considered in the process of real-time changes in reservoir water level.By comparing the simulation results of the Dahua landslide in Lanping County,Yunnan Province during the rise of the reservoir water level with the field monitoring data,the rationality of considering the water-induced deterioration effect of the mechanical parameters of the sliding body was verified.In the end,the engineering application of the deformation evolution law of the Dahua landslide considering water-induced deterioration was carried out.