地质通报2023，Vol.42Issue(12)：2185-2197,13.DOI:10.12097/j.issn.1671-2552.2023.12.014
四川泸定昔格达组滑坡灾害运动过程模拟分析
Simulation analysis of landslide disaster movement process in Xigeda Formation,Luding County,Sichuan Province
摘要
Abstract
The Xigeda Formation developing in Luding County,Sichuan Province,is mainly composed of semi-diagenetic rocks,which has complex engineering geology properties.Shallow creep deformation of the Xigeda Formation often occurs in the slope with high and steep terrain.It can transform into debris flow after destabilization under the action of heavy rainfall.In this paper,the Huanhuancun landslide in Haiziping developing in the Xigeda Formation was selected as a study case.Based on remote sensing interpretation,field investigation and numerical simulations,we analyzed and calculated the development characteristics of landslides,potential instability modes and the process of landslide-debris flow movement.This study has shown that the Huanhuancun landslide is mainly developed in the Xigeda Formation,mainly in the shallow deformation with a depth of 3～5 m,and is in the creep deformation stage as a whole.The landslide in plane can be divided into strong deformation zone(A)and weak deformation zone(B)with the volume of approximately 5.5×104m3 and 5.8×104 m3.Under different rainfall conditions,there are only two forming patterns of disasters:zone A sliding and zone A pulling zone B sliding together and transforming into gully debris flow.When only the zone A slides downslope,the longest movement distance can reach 1325 m,the maximum thickness of deposits is 5.2 m,the maximum velocity is 41.6 m/s,and the sliding body will damage the residential areas and roads.When the zone A and B slides together,the maximum movement distance can reach 1345 m,the maximum thickness of deposits is 7.7 m,the maximum velocity is 44.3 m/s,and the sliding body can rush as far as the other side of the river,forming a landslide dam with a height of about 3 m.The research results have certain guiding significance for deepening the understanding of remote disaster effect of shallow landslide-debris flow and disaster prevention and mitigation.关键词
昔格达组/土质滑坡/滑坡-泥石流/Massflow/危险性评价Key words
Xigeda Formation/soil landslide/landslide-debris flow/Massflow/risk assessment分类
天文与地球科学引用本文复制引用
宋德光,吴瑞安,马德芹,郭长宝,王炀,倪嘉伟,李祥..四川泸定昔格达组滑坡灾害运动过程模拟分析[J].地质通报,2023,42(12):2185-2197,13.基金项目
国家重点研发计划项目专题《复杂山区典型滑坡物理模拟与危险性评价》(批准号:2021YFC3000505-02)、中国地质调查局项目《川藏铁路高位远程地质灾害与高边坡稳定性调查》(编号:DD20221816-3)和中央科研院所基本科研业务费项目《川藏交通廊道水岩作用下大型深层滑坡灾变》(编号:DZLXJK202009) （批准号:2021YFC3000505-02）
