成都理工大学学报（自然科学版）2017，Vol.44Issue(4)：385-402,18.DOI:10.3969/j.issn.1671-9727.2017.04.01
茂县滑坡的滑动机制与震后滑坡形成的地质条件
Sliding mechanism of Maoxian landslide and geological condition analysis of formation of post-earthquake landslide
摘要
Abstract
On June 24,2017,a large rocky landslide occurred at the Xinmo village,Maoxian County,Sichuan,after the Wenchuan earthquake in 2008.The landslide is huge and destructive,resulting in huge loss of life and property.Based on the field survey data and other collected data,the geometric characteristics and sedimentary characteristics of the Maoxian landslide are studied,the characteristics and effect of rainfall,historical earthquakes and active faults on the landslides are discussed,and the sliding mechanism and dynamic mechanism of Maoxian landslide are proposed.The study reveals that the landslide is located in the special area clamped by Songpinggou fault and the Minjiang fault with a steep slope landform and the faults are characterized by "X" pattern in the plane with a back thrust mode in the profile.Investigation shows that intense historical earthquakes have occurred in the area and the strong repetitive vibration destroyed the rock mass structures.Therefore,the active faults and historical earthquakes in the area are the main factors responsible for the formation of the Maoxian landslides,and the rainfall is only the predisposing factors trigger the landslides.The in site investigation also demonstrates that the sliding model of Maoxian landslide is characterized by layer parallel pull-apart together with slope parallel sliding.These are 3 stages in the formation processes of Maoxian landslide,beginning with the mountain rock cracking stage,then the high speed crushing stage and followed by debris flow accumulation stage.The steep slope and downward grade provide potential energy for the landslide.Well developed permeability interface between meta-sandstone and slate provide sliding condition bringing in the layer parallel pull-apart and slope parallel sliding.The fault compression induced uplift of Fugui Mountain,together with the accumulation of high-intensity historical earthquake vibration and accumulation of deformation,which resulted in long-term damage to the mountain rock structure,are the fundamental factors leading to the Maoxian landslide.关键词
茂县滑坡/几何形态/沉积物/滑动机制/历史地震/降雨/活动断裂/形成机制Key words
Maoxian landslide/geometric features/sedimentary characteristics/sliding mechanism/historical earthquake/rainfall/active fault/formation mechanism分类
天文与地球科学引用本文复制引用
邵崇建,李芃宇,李勇,兰恒星,周荣军,邓涛,颜照坤,闫亮,李立军..茂县滑坡的滑动机制与震后滑坡形成的地质条件[J].成都理工大学学报（自然科学版）,2017,44(4):385-402,18.基金项目
国家自然科学基金项目(41525010,41472282,41502116,41372114,41340005,41172162). （41525010,41472282,41502116,41372114,41340005,41172162）
