水文地质工程地质2011，Vol.38Issue(3)：110-114,119,6.
汶川地震触发平溪村滑坡特征及成因分析
Characteristics and cause analysis of the Pingxi landslide triggered by the Wenchuan earthquake
摘要
Abstract
The Pingxi landslide is a highspeed rock landslide located in Pingwu County of Mianyang City. It was triggered by the Wenchuan earthquake. It covers an area of 3.7 × 104 m2 and its volume is 65 × 104 m3, the sliding direction is about 340°. This landslide is mainly composed of Cambrian crystalline limestone, with the development of the following two control structural plane: ① N55° -65°W/NE and ② N75° -85°E/SE. The distance between the landslide and the Shikan fault in Yingxiu - Beichuan seismogenic fault is 500 m or less. Different from the smooth and somewhat arcwall slip surface caused by gravity force, the slip surface of landslide triggered by seismic force is steep and rough. The cause of earthquake-landslide can be divided into three stages: ① the stage of shattering cracking, ② the stage of friction decrease and "locked section" snipping, and ③ the stage of slope mass sliding- accumulating. Shock cracking occurs within the rockmass, causing the debacle surface to form and interconnect, and constituting the perimeter of slope mass to slide. After the sliding perimeter occurs, “locked section" in the landslide front is snipped sharply, and slope mass slides with high speed along the slip surface. Combining with mechanical analysis of structural plane and using numerical simulation to analyze the stress and earthquake-induced deformation under earthquake are of important significance to the study of earthquake-landslides.关键词
地震滑坡/基本特征/成因机制/数值模拟Key words
earthquake-landslide/ Pingxi landslide/ Wenchuan Earthquake分类
天文与地球科学引用本文复制引用
袁进科,黄润秋,裴向军,张元才,刘云鹏..汶川地震触发平溪村滑坡特征及成因分析[J].水文地质工程地质,2011,38(3):110-114,119,6.基金项目
国家自然科学基金资助项目(40972195) （40972195）
科技部"973"计划资助项目(2008CB425801) （2008CB425801）
地质灾害国家重点实验室自主研究项目(119-000022-09) （119-000022-09）
交通部西部交通建设科技项目(200831800098) （200831800098）
