Development characteristics of unloading zones of high and steep bank slope in the Yiong Tsangpo of Tibet and its engineering significance

DU Shihui; ZHANG Xiaoyu; ZHANG Guangcheng; CHANG Shuaipeng; GAO Xu; MENG Xianglian; MIAO Xiaoqi; HUANG Yong

2021 Vol. 40, No. 12

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DU Shihui, ZHANG Xiaoyu, ZHANG Guangcheng, CHANG Shuaipeng, GAO Xu, MENG Xianglian, MIAO Xiaoqi, HUANG Yong. Development characteristics of unloading zones of high and steep bank slope in the Yiong Tsangpo of Tibet and its engineering significance[J]. Geological Bulletin of China, 2021, 40(12): 2043-2051.

Citation:

DU Shihui, ZHANG Xiaoyu, ZHANG Guangcheng, CHANG Shuaipeng, GAO Xu, MENG Xianglian, MIAO Xiaoqi, HUANG Yong. Development characteristics of unloading zones of high and steep bank slope in the Yiong Tsangpo of Tibet and its engineering significance[J]. Geological Bulletin of China, 2021, 40(12): 2043-2051.

Development characteristics of unloading zones of high and steep bank slope in the Yiong Tsangpo of Tibet and its engineering significance

1.
China Railway First Survey & Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China
2.
Shaanxi Provincial Key Laboratory of Railway and Underground Traffic Engineering (China Railway First Institute), Xi'an 710043, Shaanxi, China
3.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China

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Corresponding author: ZHANG Xiaoyu, 693673108@qq.com

Received Date: 15 June 2021

Revised Date: 03 November 2021

Publish Date: 15 December 2021

Abstract

Abstract

Located at the top of the eastern Himalayan tectonic junction on the Qinghai-Tibet Plateau, the Yiong Tsangpo River basin is characterized by the alpine and gorge landform, complex structure, and frequent occurrence of geological disasters and instability of high and steep slopes. In order to determine the formation mechanism of geological disasters and the mode of slope instability in Yiong Tsangpo River basin, through the investigation of slope structural plane, directional inclined drilling, in-hole wave velocity test, adit exploration and seismic wave method, the development law of typical bank slope unloading zone in Yiong Tsangpo River basin was analyzed, and the bank slope unloading zones were divided by core integrity, fracture opening, rock mass wave velocity and other indexes. The results show that the unloading degree of rock mass weakens gradually from shallow to deep part of the slope, the higher the elevation is, the stronger the unloading development is, and the unloading degree of the west bank of the valley is obviously stronger than that of the east bank. It is concluded that the slope surface below 0 m to 20~30 m is a strong unloading zone, 20~30 m to 40~45 m is a weak unloading zone, and below 40~45 m is a non-unloading zone. Based on the stability analysis results of the bank slope, it is proposed that the slope is strengthened with anchor cables and bolts, and engineering prevention and control measures can be taken such as the clearing of dangerous rocks at the entrance, blocking and anchoring. The research results are of great significance for the guiding of planning and construction of highway, railways and hydropower, regional disaster prevention and mitigation.
- Qinghai-Tibet Plateau /
- Yiong Tsangpo /
- high and steep slope /
- unloading zone /
- slope stability

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