基于动态强度双折减系数法的滑坡灾变过程模拟

Simulation of Landslide Disaster Process Based on Dynamic Strength Double Reduction Coefficient Method

为了模拟滑坡的灾变过程,提出了动态强度双折减系数法,实现了对滑坡折减系数的合理分布,通过对李家湾滑坡灾变过程的模拟,分析了各个位移分量变化趋势。结果表明,位移突变以破积土前缘最为突出,依据应变累积速率的不同,可以将整个灾变过程划分为稳定状态、欠稳定状态和失稳状态。通过失稳判别和双折减系数的处理,对李家湾滑坡进行了稳定性评价。结果表明,动态强度双折减系数法评价滑坡稳定性偏于安全,经过处理得到的滑坡综合安全储备都要小于整体强度折减法的结果,但两者的结果相近,说明动态双折减系数折减在用于滑坡的灾变过程模拟和稳定性评价都是合理的。

In order to simulate the disaster process of landslide,a dynamic strength double reduction coefficient method is proposed.The reasonable distribution of landslide reduction coefficient is realized.The variation trend of each displacement component is analyzed thorough the simulation of the disaster process of the Lijiawan landslide.The results show that the displacement mutation is most prominent in the front edge of the alluvial soil.The whole catastrophic process can be divided into stable,under stable state and unstable state according to the difference of strain accumulation rate.The stability evaluation of Lijiawan landslide is carried out by the determination of instability and treatment of double reduction coefficient.The results show that the dynamic strength double reduction coefficient method is more safe to evaluate the stability of landslide.The compressive safety reserve of landslide after treatment is less than that of the overall strength reduction.But the results are similar.It shows that the dynamic strength double reduction coefficient method is reasonable in the process simulation and stability evaluation of landslide.