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- Title
岷江河谷深层倾倒形成演化特征及堵江灾害链效应.
- Authors
蒙明辉; 崔圣华; 张文; 刘康林; 杨学之; 覃亮; 蒋涛
- Abstract
Minjiang River Valley is located in Longmenshan strong earthquake area. In recent years, a large number of chain disasters such as landslides caused by dumping deformation have occurred, resulting in heavy casualties. In order to analyze the evolution characteristics of deep dumping and disaster chain effect in Minjiang River Valley, taking the high-level super large dumping of Ti zicao only 10 km away from Xinmo village landslide in Mao County as an example. By means of geological mapping, drilling, geophysical exploration, well exploration, monitoring, laboratory test and numerical simulation, the basic characteristics of landslide were proved, the formation mechanism of landslide was analyzed, and the chain effect of disaster was studied. The results show these as follows. The scale of ladder trough landslide is 1 388.2x104 m³, and the landslide structure is complex. The upper part of the slide body is silty clay mixed with fragments, and the lower part is fragmentary rock. The slide zone is silty clay mixed with breccias, with an average thickness of 4.5 m and a maximum of 10 m, and the rub marks are clearly visible. The landslide deformation is severe, and cracks can be seen everywhere on the slope body. The length of the through-through crack at the rear edge is about 750 m, and the height of the fault is 5~10 m. The landslide experiences five deformation stages, mainly the dumping and breaking of antidumping stratified rock mass. The fracture zone weathers into "soil", and the instability failure occurres under the action of rainfall and earthquake in the later period. Once the landslide is unstable, it will block the Minjiang River and cause the disaster chain. According to the prediction analysis of the evolution of the dam-break flood disaster chain, the flood will inunge Jinlongtan Hydropower Station, Lianghekou, Feihong Township and Goukou Town, and will inunge and affect 20.2 km of G213 national Road, with the total damage assets of 450 million yuan, but the impact on Maoxian county is small.
- Publication
Science Technology & Engineering, 2022, Vol 22, Issue 27, p11829
- ISSN
1671-1815
- Publication type
Article