汉源县中海村“8·21”雨后型滑坡特征与成因  

Characteristics and causes of 8·21 rainfall-induced landslide at Zhonghai Village,Hanyuan County,Sichuan,China

作　　者：李宇嘉 陈宁生[2,3] 杨溢 侯儒宁 何杰 倪化勇 刘恩龙[7] LI Yujia;CHEN Ningsheng;YANG Yi;HOU Runing;HE Jie;NI Huayong;LIU Enlong(Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China;Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Ministry of Water Resources, Chengdu 610041, China;Academy of Plateau Science and Sustainability, Xining 810016, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Tourism and Urban-rural Planning, Chengdu University of Technology, Chengdu 610059, China;Institute of Exploration Technology, China Geological Survey, Chengdu 611734, China;College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,昆明650093 [2]中国科学院、水利部成都山地灾害与环境研究所,成都610041 [3]高原科学与可持续发展研究院,西宁810016 [4]中国科学院大学,北京100049 [5]成都理工大学旅游与城乡规划学院,成都610059 [6]中国地质调查局探矿工艺研究所,成都611734 [7]四川大学水利水电学院,成都610065

出　　处：《成都理工大学学报（自然科学版）》2022年第2期185-195,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金国际(地区)合作与交流项目(41861134008);国家自然科学基金联合基金项目(U20A20110);国家重点研发计划项目(2018YFC1505202)。

摘　　要：探讨2020年8月21日四川省汉源县中海村突发滞后于降雨42 h的中型昔格达组滑坡特征及其成因。通过现场调查、无人机航拍、遥感解译、实验分析等方法,对滑坡的形成原因和演化特征进行分析。中海村滑坡属于典型的昔格达组地层顺层基岩滑坡,滑坡面积8.10×10^(4) m^(2),后缘陡坎高7 m,平均厚度约7 m,滑坡总体积58.00×10^(4) m^(3);降水通过滑坡体两侧冲沟和干旱土体表层产生的微裂缝渗入。前期超平均降雨量93%的降雨主导了滑坡的发生;滑坡区昔格达组地层及阶梯状地形为地下水的补给提供了条件,降雨和灌溉水通过干旱土体裂隙补充地下水的过程和地下水在砂岩、黏土岩互层结构中发生的转化过程导致了滑坡滞后。The middle scale Xigeda Formation landslide at Zhonghai Village,Hanyuan County,Sichuan Province occurred suddenly 42 hours behind the rainfall on August 21,2020.By means of field investigation,UAV aerial photography,remote sensing interpretation and experimental analysis,the landslide characteristics and causes of the landslide are discussed,and the formation reasons and evolution characteristics of the landslide are analyzed.The results show that the Zhonghai Village landslide is a typical bedding bedrock landslide of Xigeda Formation,with an area of 8.10×10^(4) m^(2),a back slope height of 7 m,an average thickness of about 7 m,and a volume of 58.00×10^(4) m^(3).The precipitation infiltrates through gullies on both sides of the landslide and micro-cracks in the surface of the arid soil.It is considered that the occurrence of this landslide was dominated by the rainfall 93%above the average level in the early stage.The strata and stepped topography of Xigeda Formation in the landslide area provided conditions for groundwater recharge.While the process of replenishment of groundwater by rainfall and irrigation water through cracks in arid soil,and the transformation of groundwater in interbedded sandstone and clay rock led to the landslide lag of Zhonghai Village landslide.

关 键 词：中海村滑坡 雨后型滑坡 成因机制 昔格达组 降雨入渗 

分 类 号：P642.22[天文地球—工程地质学]