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| Citation: | ZHENG Guang, XU Qiang, JU Yuanzhen, LI Weile, ZHOU Xiaopeng, PENG Shuangqi. 2018: THE PUSACUN ROCKAVALANCHE ON AUGUST 28, 2017 IN ZHANGJIA-WAN NAYONGXIAN, GUIZHOU: CHARACTERISTICS AND FAILURE MECHANISM. JOURNAL OF ENGINEERING GEOLOGY, 26(1): 223-240. doi: 10.13544/j.cnki.jeg.2018.01.023
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THE PUSACUN ROCKAVALANCHE ON AUGUST 28, 2017 IN ZHANGJIA-WAN NAYONGXIAN, GUIZHOU: CHARACTERISTICS AND FAILURE MECHANISM
doi: 10.13544/j.cnki.jeg.2018.01.023
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Abstract
A large scale of mountain rock avalanche occurred in Pusa village, Zhangjiawan town, Nayong county, Guizhou Province at about 10:30 on August 28, 2017. The rock mass with the volume of 49.1×104 m3 moved down and scraped the original loose deposits and finally formed deposits of 82.3×104 m3, which destroyed parts of Pusa village, resulted in the death of 26 persons and missing of 9 persons. Based on site investigation, unmanned aerial vehicle(UAV)photography and ground based synthetic aperture radar(GBSAR)monitoring and other technologies, this paper provides a detailed description on the characteristics and a comprehensive analysis on the dynamic process and failure mechanism of the rock avalanche. The preliminary study suggested that the rock masses of the source area were shattered due to the underground mining activities. The shattered rock masses suffered long-term effects of gravity, which eventually resulted the failure of the rock masses. The movement of the rock avalanche lasted for 7 minutes and 21 seconds in which the main rock masses failure lasted for only 26 seconds with the long runout of 788 m and the maximum speed of 43.83 m·s-1, belonging to typical high speed and long runout rock avalanche. There will be a big attribution if such case can be studied further. It can provide the significant experience on dealing with this kind of rock masses failure and how to provide advice on early warning and remediation project on similar cases in southwestern mountain areas of China. -
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References
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- Figure 1. Pre-sliding and post-sliding images of Pusacun rockavalanche
- Figure 2. Flowchart indicating the data and methods used in this study
- Figure 3. Geological map of the investigated area showing the outline of 8.28 Pusacun rockavalanche
- Figure 4. The stratums and their distribution in Pusacun rockavalanche source area
- Figure 5. 3D satellite image of the investigated area showing the outline of Pusacun rockacalanche(the image was taken on Mar. 18 2014, copyright@Google Earth)
- Figure 6. Images of the rockavalanche source area showing the cracks
- Figure 7. Images of the rockavalanche source area
- Figure 8. The runaway process of the rockmass in source area
- Figure 9. The runaway process of rightside of rockmass in source area
- Figure 10. Conceptual models of formation and development process of the unstable rock mass in the source area
- Figure 11. Avalanche source area and depositional area of Pusacun rockavalanche
- Figure 12. Pre-sliding and post-sliding DEMs of Pusacun rockavalanche
- Figure 13. 3D model of Pusacun rockavalanche showing the source area and transportation area
- Figure 14. 3D aerial image of the depositional area of Pusacun rockavalanche
- Figure 15. Cross section of Pusacun rockavalanche
- Figure 16. Velocity profile of Pusacun rockavalanche
- Figure 17. The unstable rock masses surrounding the source area
- Figure 18. The unstable rock mass on the rear of the source area
- Figure 19. The unstable rock mass on the north side of the source area
- Figure 20. The unstable rock mass on the south side of the source area
- Figure 21. Cracks on the unstable rock mass of the south side of the source area
- Figure 22. The displacement monitoring curve of the unstable rock mass in main scarp by GBSAR
- Figure 23. The displacement monitoring curve of the unstable area by Beidou Monitoring System
- Figure 24. Cumulative curve of rainfall prior to rockavalanche occurrence in Zhangjiawan town near the Pusacun rockavalanche