基于滑带强度参数动态演化的滑坡稳定性研究

Stability study of landslide based on dynamic evolution of sliding surface strength parameter

基于滑带应力状态分析和室内试验,提出了基于滑带强度参数动态演化的滑坡稳定性评价方法,并将应力状态作为评价滑面力学参数的主要指标,以合理地反映滑面强度状态对滑坡稳定性的影响。通过室内试验,获得了滑面强度参数与工程性状、力学参数之间的量化关系,在该基础上,通过数值计算,对滑面的力学参数和滑坡的稳定性进行三维计算。计算结果表明,利用提出的方法能较好地反映出滑带强度参数的空间分区特征。同时,对工况变动情况下滑带的强度参数进行量化取值,并对滑坡的稳定性进行动态计算,提出的计算方法更能体现出滑坡力学参数与稳定性的动态变化过程。

A dynamic evaluation of landslide sliding surface strength parameters approach is proposed to analyses the stability of large-scale landslides which are controlled by groundwater fluctuations within the slide. The proposed approach utilizes a dynamic model in conjunction with stress state to describe the strength parameters of the sliding surface. Both experimental and theoretical analyses are carried out. Subsequently, three-dimensional numerical modelling of the landslide is carried out to explore the influence of three-dimensional sliding surface geometry and groundwater level fluctuations on sliding surface strength parameters. Simulations of the slide suggest that the approach proposed can describe the strength parameters of Badi landslide. In addition, simulations indicate that groundwater has not significantly influenced on sliding surface strength parameters under situ stress state.