缓倾顺层岩质滑坡机理研究——以广元市苍溪县中梁村滑坡为例  

Mechanism of gently dipping bedding rock landslide―A case study of Zhongliang Village landslide in Cangxi County,Guangyuan City

作　　者：朱志明 欧阳继胜 张子龙 胡艺霏 葛云峰[3] ZHU Zhiming;OUYANG Jisheng;ZHANG Zilong;HU Yifei;GE Yunfeng(Hydrogeologic and Engineering Geologic Institute of Hubei Geological Bureau,Wuhan 430050,China;Wuhan Institute of Geological Engineering Exploration Co.,Ltd.,Wuhan 430050,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]湖北省地质局武汉水文地质工程地质大队,湖北武汉430050 [2]武汉地质工程勘察院有限公司,湖北武汉430050 [3]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2025年第1期233-243,共11页Safety and Environmental Engineering

基　　金：湖北省地质局武汉水文地质工程地质大队科研项目(WSKJ-2022-04)。

摘　　要：近年来苍溪县在持续强降雨作用下连续发生了多处缓倾顺层岩质滑坡,滑坡的倾角多在5°~15°之间,缓倾顺层岩质滑坡机理的研究对于苍溪县滑坡的预防和治理具有重要意义。通过现场调查和勘探等工作对中梁村滑坡机理进行分析研究,根据苍溪县缓倾顺层岩质滑坡的形态特征对滑坡的演化过程进行推理,并选取该滑坡的4个剖面进行滑坡稳定性定量评价计算与模型模拟验算。结果表明:(1)中梁村岩质滑坡是由于滑坡表层岩土体结构松散、岩性软弱、易被水侵蚀,且滑坡后缘堰塘持续排水以及连续强降雨不断入渗,致使后缘拉陷槽扩大、滑带润滑、滑体重量增加而形成的;(2)根据滑坡发展历程,结合滑坡区气象水文、地质构造等因素,依据滑坡在发展过程中主要特性的变化,可将中梁村滑坡演化过程分为6个阶段;(3)在天然工况下滑坡整体处于稳定状态,但在暴雨饱和工况下滑坡处于欠稳定状态,与模型模拟的结果一致。研究结果可为当地滑坡的研究与治理提供理论依据和技术支持。In recent years,Cangxi County has suffered from several gently dipping bedding rock landslides under the action of continuous heavy rainfall,the inclination angles of landslides are mostly between 5°and 15°,the research on the mechanism of gently dipping bedding rock landslide is of great significance for the prevention and treatment of landslide in Cangxi County.Through field investigations and exploratory works,the mechanism of Zhongliang Village landslide was analyzed and studied.The morphological characteristics of gently inclined bedding rockslides in Cangxi County were used to infer the evolution process of the landslide.A qualitative and quantitative assessment of the landslide’s stability was conducted,and four cross-sections of the landslide were selected for calculation and model simulation validation.The research results are as follows:①The rock landslide in Zhongliang Village is triggered by the loose structure and weak lithology of the surface rock-soil layer,which is prone to water erosion.The continuous drainage from the pond at the rear edge of the landslide,combined with the incessant infiltration from heavy rainfall,leads to the expansion of the rear-edge tension trough,lubrication of the sliding zone,and an increase in the weight of the sliding mass,ultimately causing the landslide.②Based on the development history of the landslide,along with an analysis of the meteorological,hydrological,and geological conditions in the area,the landslide in Zhongliang Village can be divided into six stages.These stages are defined by the key changes observed during the development process of the landslide.③The landslide remains stable under natural conditions but becomes unstable when saturated by heavy rainfall.These findings align with the results from the model simulations.These studies provide theoretical basis and technical support for the study and management of local landslides.

关 键 词：岩质滑坡 缓倾顺层 演化过程 数值模拟 现场调查 稳定性分析 

分 类 号：X4[环境科学与工程—灾害防治]