四川省汉源县中海村滑坡特征与运动过程分析

Characteristics and Movement Process of Zhonghaicun Landslide in Hanyuan County,Sichuan Province

受持续降雨影响,2020年8月21日凌晨,四川省汉源县中海村发生滑坡灾害导致人员伤亡。在详细现场调查和滑坡特征分析的基础上,采用MatDEM软件对滑坡运动过程进行了数值模拟分析,结果表明:中海村滑坡是发育在昔格达组地层的中型滑坡,持续降雨致使滑面强度劣化降低是滑坡的主要触发因素;滑坡运动过程可划分为启滑冲击、运动刮铲和堆积停止3个阶段,滑源区对冲击滑移区的二次冲击导致滑坡范围的进一步扩大;运动过程的重力势能总耗散量和摩擦热能增长量分别为8.141×10^(11) J和8.117×10^(11) J,滑坡重力势能主要转化为颗粒单元间的摩擦热能。研究成果对昔格达组半成岩地层的滑坡灾害防治具有重要意义。

Due to prolonged rainfall,a landslide disaster occurred on August 21,2020 in Zhonghai Village,Hanyuan County,Sichuan Province,resulting in casualties.Through extensive on-site investigation and analysis of landslide characteristics,a numerical simulation of the landslide movement process was conducted with MatDEM software.Findings indicate that the Zhonghaicun landslide is a medium-sized landslide formed within the Xigeda Formation stratum.The continuous rainfall weakened the sliding surface's strength and caused its deterioration,which was the primary triggering factor of the landslide.The landslide movement process can be classified into three stages,which are starting-sliding impact,moving scraping shovel,and accumulation stop.The secondary impact of the sliding source area on the impact-sliding area led to further expansion of the landslide's range.The total dissipation of gravitational potential energy during the movement process is 8.141×10^(11) J,while heat energy from frictional forces is 8.117×10^(11) J.Most of the landslide's gravitational potential energy is converted into frictional heat energy between individual particles.These research results are highly significant for the prevention and control of landslide disasters in the semi-diagenetic strata of the Xigeda Formation.