巴东组滑坡监测预警阈值研究——以长堰沟滑坡为例  

Monitoring and early warning threshold of landslide in Badong Formation:A case study of Changyangou landslide

作　　者：秦磊[1] 黄伟业 李兴明 Qin Lei;Huang Weiye;Li Xingming(Hubei Land Resources Vocational College,Wuhan,Hubei 430090;Guangdong Provincial Center for Geological Disaster Emergency Rescue Technology,Guangzhou,Guangdong 510080)

机构地区：[1]湖北国土资源职业学院,湖北武汉430090 [2]广东省地质灾害应急抢险技术中心,广东广州510080

出　　处：《资源环境与工程》2024年第5期627-636,共10页Resources Environment & Engineering

摘　　要：为提高地质灾害预警精度,开展地质灾害监测预警阈值研究是建设预警信息化工程的基础。以湖北省典型巴东组滑坡——长堰沟滑坡为例,通过室内试验和数值模拟,综合划分巴东组滑坡变形破坏阶段,识别各阶段变化的典型物理量参数特征,由此确定该滑坡监测预警阈值。结果表明,根据巴东组泥岩蠕变试验,长堰沟滑坡岩体变形破坏过程存在启动蠕变、等速蠕变和加速蠕变3个阶段;根据数值模拟滑坡位移变化情况,该滑坡演化过程分为启动变形、等速变形和加速变形3个阶段;建议以累计位移量0.2 m为滑坡等速变形—加速变形阶段转变的预警阈值,在此过程中裂隙间应力减小而在滑带应力集中,滑坡摩擦能、动能、应变能均急剧加大,滑体中前部裂隙形成的多处优势节理面且数量逐渐增加。研究成果揭示了巴东组滑坡“滑带-滑体”的工程地质演化特征,对滑坡“什么时候可能发生”的预警阈值研究有理论和工程意义。To enhance the accuracy of geological disaster early warning systems,research on monitoring and early warning threshold is fundamental to constructing an information-based warning system.Focusing on Changyangou landslide,a representative landslide in Badong Formation in Hubei Province,this study combined laboratory tests with numerical simulations to delineate the deformation and failure stages of these landslides comprehensively.By identifying characteristic parameters of typical physical quantities at different stages,monitoring and early warning thresholds for the landslide are established.The results show that according to the creep test of Badong Formation mudstone and the numerical simulation of landslide displacement change,the deformation and failure process of Changyangou landslide is divided into three stages:primary stage,steady-creep stage and accelerating-creep stage.The displacement of 0.2 meters can be used as the early warning threshold for the transition from steady-creep stage to accelerating-creep stage.During this process,the stress between fractures decreases while stress concentration occurs in the slip zone,leading to a sudden and sharp increase in the frictional energy,kinetic energy,and strain energy of the landslide.The number of advantageous joint surfaces formed by cracks in the front and middle parts of the landslide gradually increases.This study reveals the engineering geological evolution characteristics of the“sliding zone-sliding body”of landslide in Badong Formation,and have theoretical and engineering significance for the study of the early warning threshold of the landslide“when it may occur”.

关 键 词：巴东组滑坡 监测预警阈值 室内试验 数值模拟 

分 类 号：P642.22[天文地球—工程地质学]