川藏交通廊道黏土化蚀变岩发育特征及其对大型滑坡的促滑作用

张永双; 李金秋; 任三绍; 吴瑞安; 毕俊擘

doi:10.3799/dqkx.2022.155

Volume 47 Issue 6

Jun. 2022

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Article Navigation > Earth Science > 2022 > 47(6): 1945-1956

Zhang Yongshuang, Li Jinqiu, Ren Sanshao, Wu Ruian, Bi Junbo, 2022. Development Characteristics of Clayey Altered Rocks in the Sichuan-Tibet Traffic Corridor and Their Promotion to Large-Scale Landslides. Earth Science, 47(6): 1945-1956. doi: 10.3799/dqkx.2022.155

Citation:

Zhang Yongshuang, Li Jinqiu, Ren Sanshao, Wu Ruian, Bi Junbo, 2022. Development Characteristics of Clayey Altered Rocks in the Sichuan-Tibet Traffic Corridor and Their Promotion to Large-Scale Landslides. Earth Science, 47(6): 1945-1956. doi: 10.3799/dqkx.2022.155

Citation:

Zhang Yongshuang, Li Jinqiu, Ren Sanshao, Wu Ruian, Bi Junbo, 2022. Development Characteristics of Clayey Altered Rocks in the Sichuan-Tibet Traffic Corridor and Their Promotion to Large-Scale Landslides. Earth Science, 47(6): 1945-1956. doi: 10.3799/dqkx.2022.155

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Development Characteristics of Clayey Altered Rocks in the Sichuan-Tibet Traffic Corridor and Their Promotion to Large-Scale Landslides

doi: 10.3799/dqkx.2022.155

1.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date: 2021-09-15
Publish Date: 2022-06-25

Abstract

Abstract

Clayey altered rock is a special geological body with poor engineering geological properties formed under hydrothermal action or hydrothermal action after the magmatic period. Based on field geological survey, clay mineral identification, and physical mechanics test analysis, the formation conditions, regional distribution characteristics, geological characteristics and the criterion of alteration degree of clayey altered rocks in the Sichuan-Tibet traffic corridor are described. Taking Baige landslide as an example, the sliding promotion of clayey altered rock on large-scale landslides are discussed. The results show that the regional distribution of clayey altered rocks is controlled by active faults, hydrothermal action and lithology. The clayey altered rocks often develop along intrusive dikes, fault zones, concentrated joint zones of magmatic rocks, and contact zones between intrusive rock mass and other rock formation. According to the alteration coefficient, the degree of alteration can be divided into four grades: very low alteration, low alteration, medium alteration and high alteration. In alternating wet and dry conditions and relaxation conditions, the altered rock is easy to disintegrate and soften. The medium-high altered rock mass usually has low shearing strength. The promoting effect of clayey altered rock on landslide is mainly reflected in three aspects: strength weakening effect, rock mass structure deterioration effect and instability hysteresis effect, which is an important factor in promoting the instability of slopes and large-scale landslides in deep-cut valley slopes in tectonic melange belts.
- tectonic melange zone,
- clayey altered rock,
- engineering geological property,
- sliding promotion,
- Baige landslide

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Development Characteristics of Clayey Altered Rocks in the Sichuan-Tibet Traffic Corridor and Their Promotion to Large-Scale Landslides

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