重庆涪陵五中滑坡特征及成因分析

成国文; 李晓; 许家美; 赫建明; 李守定; 马超锋

重庆涪陵五中滑坡特征及成因分析

1.
中国科学院地质与地球物理研究所北京 100029
2.
中国科学院研究生院北京 100049 
3.
重庆市涪陵区地质环境监测站重庆 408000
4.
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成都 610059

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出版历程
- 刊出日期: 2009-04-30

CHARACTERISTICS AND CAUSES OF LANDSLIDE AT FULING FIFTH MIDDLE SCHOOL IN CHONGQING

1.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
2.
Graduate University of Chinese Academy of Sciences|Beijing |100049
3.
Chongqing Institute of Geological Environment Monitoring|Chongqing 408000
4.
State Key Laboratory of Geohazard Prevention and Geenvironment Protection, Chengdu University of Technology, Chengdu 610059

摘要

摘要: 重庆涪陵五中滑坡（130104m3）发生于2008年1月3日，该滑坡位于涪陵五中西南的迎宾大道内侧，属单斜顺层岩质滑坡。通过详细的现场调查和室内资料分析后认为：中倾坡外的顺层结构、碎裂结构的岩体为滑坡的孕育和发生提供了物质基础和结构条件，是滑坡发生的结构性因素；泥质砂岩和泥岩属中等膨胀性岩石，遇水极易软化，加之历史上构造应力的作用，形成层间泥化夹层，泥化夹层含膨胀性粘土矿物蒙脱石和伊利石，是造成滑坡发生的控制性因素。诱发因素主要有两个：一是由于水的作用，坡体岩层间泥化夹层发生软化，降低了力学强度；二是修建公路开挖坡脚进行人工切坡形成有效临空面，坡体具备了临空剪出的条件。随着坡体的蠕动变形，在各种因素的综合作用下，层间剪切带逐渐贯通，最终导致滑坡发生。
- 滑坡〓特征〓成因〓泥化夹层
Abstract: A landslide with volume of 130104m3 occurred at Fuling Fifth Middle School in Chongqing on Jan 3，2008. It is a bedding monoclinic rock landslide. This paper presents the investigation on the characteristics and causes of the landslide. The paper summarizes the findings. At firstly，the inclined terrace and cracked rock mass were the structural factors causing the landslide. Secondly, because they were softened in water and acted by tectonic stress in geologic history, the argillaceous sandstone and mudstone were prone to argillation and forming weak seams. The weak seams comprised montmorillonite and illite. The weak seams were the controlling factor causing the landslide. Thirdly, water weakened the strength of the weak seam. Finally, digging slope toe was one of the inducing factors to the landslide. With creeping of the landslide, the factors acted each other and led to the occurrence of the landslide.