Characteristics and Potential Hazard of the Chada Collapse in Eastern Tibet

doi:10.19657/j.geoscience.1000-8527.2021.009

Abstract

Abstract:

Featured by high speed, long transport and tremendous destruction, high-position collapses pose immense threats to the infrastructure, human lives and properties. The Chada high-position collapse was investigated in this study, and its development characteristics and potential hazards were analyzed through field investigation, remote sensing image analysis, unmanned aerial vehicle mapping and geophysical exploration. Our results show that the Chada high-position collapse involved a large rock volume 160×10 ⁴ m ³ now located at the foot of the slope. The height difference of the collapse is 1,340 m. The maximum horizontal distance is over 2,600 m, and the maximum estimated speed is 65.36 m/s.This demonstrates that the collapse was of high-speed and long transport. The surface of the accumulation area is densely covered with boulders, and the accumulated rocks and soil display typical inverse grading feature. There are still 4.7×10 ⁴-25×10 ⁴ m ³ unstable rocks in the collapse source area. Induced by structural compression, freezing and thawing, long-term unloading and strong earthquake, the unstable rocks may fail and threaten the infrastructure and its ancillary facilities and villages. We suggested that geophysical exploration, costeaning and real-time monitoring should be conducted to assess the slope stability, initiating condition and probability of destabilization, and to predict and delineate the affected region. According to the evaluation results, appropriate measures should be conducted for hazard prevention.

Key words: high-position collapse, high-speed and long transport, railway project, disaster prevention and mitigation

CLC Number:

P642.22

LI Yuanling, LIU Jiankang, ZHANG Jiajia, GAO Bo, TIAN You, XIONG Deqing. Characteristics and Potential Hazard of the Chada Collapse in Eastern Tibet[J]. Geoscience, 2021, 35(01): 74-82.

Figures/Tables 7

Fig.1 Location (a) and geotectonic map (b) of the Chada collapse

Fig.2 Panorama and the division characteristic photographs of the Chada collapse

Fig.3 Longisection 1-1' (a) and transverse section 2-2' (b) of the Chada collapse

Fig.4 Features of the source area of the Chada collapse

Fig.5 Features of the accumulation area of the Chada collapse

Fig.6 Features of unstable rock body on the wall of the Chada collapse

Fig.7 Diagram of velocity distribution of the Chada collapse

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