湖南省麻阳县石眼潭滑坡演变机制及破坏模式分析  

Analysis of Evolution Mechanism and Failure Mode of Shiyantan Iandslide in the Mayang County,Hunan Province

作　　者：罗冠枝 方琼 徐忠 李明波 隋皓月 LUO Guanzhi;FANG Qiong;XU Zhong;LI Mingbo;SUI Haoyue(Center for Natural Resources Affairs of Hunan Province,Changsha 410004,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]湖南省自然资源事务中心,湖南长沙410004 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《东华理工大学学报（自然科学版）》2023年第3期233-238,309,共7页Journal of East China University of Technology(Natural Science)

基　　金：湖南省自然资源厅科研项目(2020B02)。

摘　　要：为了研究湖南省红层滑坡成灾机理和破坏模式,以湖南省麻阳县石眼潭滑坡为例,运用GeoStudio软件数值模拟方法,进行10年和20年峰值降雨的滑坡稳定性模拟分析。通过对该滑坡的演变机制和破坏模式研究发现,石眼潭滑坡属于蠕滑-拉裂破坏模式,提出了稳定性系数与滑面软化面积比的一元二次关系方程:在自重作用工况下,软化面积比为25.56%,斜坡稳定性较好;在20年一遇暴雨工况下,稳定性系数为0.883,软化面积比为92.05%,斜坡处于不稳定状态。当软化面积比大于61.28%时,斜坡发生破坏的概率较大,与野外调查结果基本符合,表明此关系方程适用于该类红层滑坡。研究结果可为该类红层滑坡稳定性分析和防灾减灾提供参考。In order to study the disaster mechanism and failure mode of the red bed landslide in Hunan province,taking the Shiyantan landslide in Mayang county as an example,the GeoStudio software numerical simulation method is used to simulate and analyze the stability of the landslide under 10-year and 20-year peak rainfall conditions.Through the research on the evolution mechanism and failure mode of the landslide,it is found that Shiyantan landslide belongs to the creep tension failure mode.A one-dimensional quadratic relationship curve between the stability coefficient and the ratio of the softening area of the sliding surface is proposed.Under the self-weight condition,the softening area ratio is 25.56%,and the slope is stable.Under the 20-years rainstorm condition,the stability coefficient is 0.883,the softening area ratio is 92.05%,the slope is unstable.When the softening area ratio is more than 61.28%,the probability of slope failure is large,which is basically consistent with the field survey results.This indicates that the relationship curve is applicable to the type of red bed landslide,and the research results can provide a reference for the stability analysis,disaster prevention and mitigation of the type of red bed landslide.

关 键 词：红层滑坡 稳定性模拟分析 演变机制 破坏模式 软化面积比 

分 类 号：P642.22[天文地球—工程地质学]