暴雨工况下岗地土岩界面滑坡稳定性评价——以镇江市岗地区为例  

Stability Evaluation of Soil-rock Interface Landslide in the Hilly Area Under Rainstorm Condition:A Case Study of the Highland Area in Zhenjiang City

作　　者：崔雨 谭燕 权芹钢 方龙建 汪兵 CUI Yu;TAN Yan;QUAN Qingang;FANG Longjian;WANG Bing(The Third Geological Team of Jiangsu Geological and Mineral Bureau,Zhenjiang 212000,Jiangsu,China)

机构地区：[1]江苏省地质矿产局第三地质大队,江苏镇江212000

出　　处：《昆明冶金高等专科学校学报》2024年第4期15-22,共8页Journal of Kunming Metallurgy College

基　　金：江苏省地质局科研项目“江苏省典型地质灾害降雨量阈值研究”(2022KY03)。

摘　　要：镇江市岗地区滑坡具有“上土下岩”双层结构特征,地形特征一般上陡下缓,为该地区滑坡的主要类型。为掌握该地区滑坡的特征和发展趋势,在现场踏勘、监测的基础上,选取研究区典型区域DE段、EF段分析滑坡体的特征、形成机理和破坏模式,并利用毕肖普法对滑坡稳定性进行了综合评价。研究发现,岗地区土岩界面滑坡多发育在山体周围,滑坡整体为前后缘薄中间厚,滑坡后壁和滑坡周界清晰,规模以小型滑坡为主。降雨和人工削坡是土岩界面滑坡的主要诱导因素,暴雨工况下上部土层抗剪强度明显降低,在重力及外力作用下极易沿软弱结构面向下滑动形成滑坡。同时,对获取岗地区岩土层工程地质特征给出了合理化建议,对土岩界面滑坡稳定性评价具有一定的借鉴意义。Landslide in the hilly area of Zhenjiang city has the characteristics of a double-layer structure of“soil above and rock below”,and the topographic characteristics are generally steep on the top and slow on the bottom,forming good catchment conditions,which is the main type of landslide in this area.In order to grasp the characteristics and development trend of this type of landslide,on the basis of field survey and monitoring,the characteristics,formation mechanism and failure mode of landslide were ana-lyzed in DE and EF sections of typical areas in the study area,and the stability of landslide was compre-hensively evaluated by Bishop method.The study found that the soil-rock interface landslides in the hilly area are mostly developed around the mountain.The overall landslide is thin in the front and rear edges and thick in the middle.The landslide scarp and the periphery of landslide are clear,and the scale is dominated by small landslides.Rainfall and artificial slope cutting are the main inducing factors of soil-rock interface landslide.Under the condition of rainstorm,the shear strength of the upper soil layer is ob-viously reduced,and it is easy to slide down along the weak structure under the action of gravity and ex-ternal force to form landslide.At the same time,reasonable suggestions are given for obtaining geotechni-cal engineering geological characteristics in the region,which has certain reference significance for the stability evaluation of soil-rock interface landslide.

关 键 词：岗地地貌 土岩界面 滑坡特点 稳定性评价 毕肖普法 

分 类 号：P694[天文地球—地质学]