考虑滑带土抗剪强度参数空间变异性的黄土坡临江#1滑坡稳定性分析  

Stability Evaluation of Huangtupo No.1 Riverside Sliding Mass Considering Spatial Variability of Shear Strength Parameters of Sliding Zone Soil

作　　者：康田 薛阳 欧光照[1] 吴益平[1] KANG Tian;XUE Yang;OU Guang-zhao;WU Yi-ping(Engineering Faculty,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《水电能源科学》2020年第11期137-140,8,共5页Water Resources and Power

基　　金：国家自然科学基金项目(41977244);国家重点研发计划(2017YFC1501301);贵州省科技合作计划项目(黔科合LH字[2015]7026号)。

摘　　要：在多期次地质作用下,滑带土的抗剪强度参数存在着空间变异性,且控制着滑坡的变形破坏与稳定性,因此探究其空间变异性对滑坡稳定性的影响具有重要意义。以具有双层滑带的黄土坡临江#1滑坡为例,通过多期次地质勘察钻孔与野外综合试验场手段,获取深部滑带土的抗剪强度参数空间分布数据,结合GS+和ArcGIS地统计分析模块分析深部滑带土抗剪强度参数的统计特征值与变异特性,并对比分析不同插值方法下粘聚力与内摩擦角参数的空间变异分布特征,基于非侵入式有限元数值模拟技术和有限元强度折减法,研究了三种极端工况下滑带土力学参数确定模型与不确定模型的黄土坡临江#1滑坡稳定性差异。结果表明,黄土坡临江#1滑坡滑带土粘聚力与内摩擦角的相对较好的插值方法分别为反距离权重法(IDW)与经验贝叶斯法;短时强降雨对滑坡位移场影响更为明显;与滑带土抗剪强度参数确定型模型相比,考虑空间变异性模型的滑坡水平位移均较大,且稳定性较差。Under multiple geological effects,the spatial variability of shear strength parameters exists in the sliding zone,which controls the deformation and stability of landslide.Therefore,it is important to investigate the influence of the spatial variability of the shear strength parameters on the stability of landslide.Taking the Huangtupo No.1 riverside sliding mass as a case,the data of shear strength parameters in deep sliding zone were obtained by using multiple periods of drilling and comprehensive field test sites.Based on the GS+and ArcGIS geostatistical analysis modules,the variability of shear strength parameters of sliding zone soil was analyzed,and the spatial distribution characteristics of parameters under different interpolation methods were compared.Based on non-intrusive finite element numerical simulation and strength reduction method,the stability between the determined model and the uncertain model in three extreme conditions was studied.The results show that the best interpolation methods for cohesion and internal friction angle are inverse distance weight method(IDW)and empirical Bayes method,respectively.Compared with the deterministic model,the horizontal displacement of the landslide with the spatial variability model is larger,and the factor of safety is relatively smaller.

关 键 词：黄土坡临江#1滑坡 抗剪强度参数 空间变异性 稳定性 

分 类 号：P642.22[天文地球—工程地质学]