摘要
新铺滑坡是三峡库区广受关注的巨型复杂库岸滑坡。本文在新铺滑坡开展“天-空-地-深”综合调查监测工作,收集前期勘察资料,开展无人机LiDAR地形测绘和现场调查,对新铺滑坡及斜坡孕灾地质环境条件进行精细化调查分析,进行巡查并整理地表宏观变形迹象,再结合专业监测数据的平面变形特征、深部变形特征和时序变形特征总结形成滑坡工程地质分区。将新铺滑坡分为4个工程地质分区6个亚区,即前中部为滑移-弯曲变形区(Ⅰ区),该区域变形与降雨和地下水位变动密切相关,累计变形量和变形速率最大。中部为滑移-拉裂变形区(Ⅱ区),变形与降雨量密切相关,累积变形量和变形速率较大。滑坡中后部为浅表滑移-拉裂变形区(Ⅲ区),变形与降雨量密切相关,累积变形量和变形速率较小。滑坡后部为浅表蠕滑-拉裂变形区(Ⅳ区),累积变形量和变形速率较小且差异显著。整理形成新铺滑坡及斜坡演化的4个阶段,即为浅层蠕滑-裂缝扩展贯通阶段、整体滑移-前缘弯折变形阶段、滑移弯曲-前缘剪出阶段和古滑坡滑移-复活阶段。研究成果可为库岸单体滑坡成因机制研究和防灾减灾等工作提供参考。
Xinpu landslide is a large complex reservoir bank landslide located in the Three Gorges Reservoir area.This study conducted comprehensive investigation and monitoring of the landslide using an integrated“air-space-ground-deep”approach.Preliminary investigation data were collected through UAV LiDAR topographic mapping and field surveys.Detailed investigation and analysis were carried out on the geological environmental conditions of the Xinpu landslide and slope,along with inspection and documentation of macroscopic surface deformation signs.Based on the planar deformation characteristics,deep deformation features,and time-series deformation patterns derived from professional monitoring data,the landslide was divided into engineering geological zones.The Xinpu landslide is categorized into four main engineering geological zones and six sub-zones:the front and middle slip-bending deformation zone(Zone Ⅰ),where deformation is strongly influenced by rainfall and groundwater level fluctuations,exhibiting the largest cumulative deformation and highest deformation rate;the central slip-strain deformation zone(Zone Ⅱ),where deformation is also closely related to rainfall,with significant cumulative deformation and deformation rate;the middle-rear shallow slip-strain deformation zone(Zone Ⅲ),where deformation is rainfall-sensitive but with relatively small cumulative deformation and rate;and the rear shallow creep-strain deformation zone(Zone Ⅳ),which shows minor yet distinct cumulative deformation and deformation rate.The evolutionary process of the Xinpu landslide and slope is divided into four stages:shallow creep slip and crack propagation stage,integral sliding with front bending deformation stage,slip-bending and front cutting stage,and reactivation of the paleo-landslide stage.The research results provide a valuable reference for studying the genetic mechanisms of reservoir bank landslides and for disaster prevention and mitigation efforts.
作者
陈龙
李厚芝
陈欢
冯晓亮
李长明
舒勤峰
李扬
黄磊博
李子章
CHEN Long;LI Houzhi;CHEN Huan;FENG Xiaoliang;LI Changming;SHU Qinfeng;LI Yang;HUANG Leibo;LI Zizhang(Institute of Exploration Technology,Chengdu 611734,China;Technology Innovation Center for Risk Prevention and Mitigation of Geohazard,Ministry of Natural Resources,Chengdu 611734,China;Chengdu Huajian Geological Engineering Technology Co.,Ltd.,Chengdu 611734,China)
出处
《工程地质学报》
北大核心
2025年第4期1388-1401,共14页
Journal of Engineering Geology
基金
中国地质调查局地调项目(资助号:DD20230447)
中国地质科学院探矿工艺研究所科研项目(资助号:2022001)。
关键词
库岸滑坡
三峡库区
滑坡成因机制
滑坡变形监测
Landslide on the reservoir bank
Three Gorges Reservoir region
Mechanism of landslide formation
Landslide deformation monitoring
作者简介
第一作者/通讯作者:陈龙(1988-),男,博士生,高级工程师,主要从事地质灾害监测预警和调查评价方面的科研工作.E-mail:clong@mail.cgs.gov.c。
