沐川县某滑坡形成机制及复活预测  

Formation Mechanism and Resurrection Forecasting of Landslide in Muchuan County

作　　者：张光鑫[1] 杨强[1] 冯文凯[1] 李长顺[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]四川省地质调查院,四川成都610081

出　　处：《成都大学学报（自然科学版）》2017年第2期213-216,共4页Journal of Chengdu University（Natural Science Edition）

基　　金：四川省科技厅青年科技创新研究团队专项计划(2017TD0018)资助项目

摘　　要：通过对沐川县某平推式滑坡调查分析得出其形成机制:在地震波作用下,坡体在‘楔劈'效应、杠杆作用和PGA放大效应耦合作用下,于坡肩处产生震裂裂隙;其后在降雨入渗作用下,裂缝发育、贯通,坡体蠕变加速;最后在强降雨作用下,滑坡启动.模拟计算发现:当降雨强度为2 mm/h时,滑坡复活可能性不大;而当降雨强度分别为5 mm/h、7 mm/h、10 mm/h工况下,持续降雨时间分别达60 h、45 h、30 h时,滑坡有较大概率复活.Formation mechanism was obtained by investigation and analysis of the horizontal pushing land-slide in Muchaun County. Under the influence of the seismic wave, shatter cracks appeared on the slopes due to the coupling of “ cuneiform splitting” effects,leverage effects and PGA amplification effects. Then, under the infiltration of rainfalls, the fracture developed, ran through the whole slope and the creep defor-mation accelerated. Finally in heavy rains, the landslide happened. Simulation calculation finds that when the rainfall intensity is 2 mm/h, landslide is unlikely to happen while when the rainfall intensity achieves 5 mm/h,7 mm/h, 10 mm/h respectively and when the rainfall duration amounts to 60 h,45 h,30 h individu-ally, landslide resurrection is probably to happen.

关 键 词：平推式滑坡 杠杆作用 降雨强度 滑坡复活 

分 类 号：P642.22[天文地球—工程地质学]