TY - CONF
T1 - Deformation and Failure Mechanism of a collapse induced by underground mining—A study of the Pusa collapse in Guizhou province of China
AU - Shi, W. B.
AU - Yu, X. X.
AU - Sherizadeh, T.
AU - Sunkpal, M.
AU - Wang, X. M.
AU - Kulatilake, P. H.S.W.
N1 - Funding Information:
The first author of this paper is grateful to the Chinese Scholarship Council (Grant No. 201806675012) for providing a scholarship to conduct the research as a Visiting Research scholar at the Missouri University of Science and Technology.
Funding Information:
This study is financially supported by High Level Introduction of Talent Research Start-up Fund of Guizhou University (Grant No.2017077); Projects of Science and Technology Platform and Talent Team of Guizhou Province of China (Grant No.20175402 and No.20185781); Project of Youth Science and Technology Talent Growth of Education Department of Guizhou Province of China (Grant No. 2018117); The first-class subject foundation of Civil Engineering of Guizhou Province of China (Grant No. 20170013).
Funding Information:
This study is financially supported by High Level Introduction of Talent Research Start-up Fund of Guizhou University (Grant No.2017077); Projects of Science and Technology Platform and Talent Team of Guizhou Province of China (Grant No.20175402 and No.20185781); Project of Youth Science and Technology Talent Growth of Education Department of Guizhou Province of China (Grant No. 2018117); The first-class subject foundation of Civil Engineering of Guizhou Province of China (Grant No. 20170013). The authors also express our gratitude to Research fellow X.W Liu, Professor S.Z. Zuo, Dr. F. Liang for their valuable help in this study. The first author of this paper is grateful to the Chinese Scholarship Council (Grant No. 201806675012) for providing a scholarship to conduct the research as a Visiting Research scholar at the Missouri University of Science and Technology.
Publisher Copyright:
© 2019 American Rock Mechanics Association (ARMA). All rights reserved.
PY - 2019
Y1 - 2019
N2 - The rock structures at Pusa Village, located in the karst mountainous area of Nayong County, Guizhou Province, China are gently dipping. The upper part of this mountain is composed of hard rock layers while the lower section is made up of soft rocks which includes six (6) coal seams. Mining the coal seams excited the rest of the slope body leading to instability of the upper portions. On August 28, 2017, a massive landslide occurred in this area which resulted in the generation of 82, 500 cubic meters of debris. Significant casualties and social impacts were recorded. Twenty-six (26) fatalities and nine (9) missing people were reported. In this paper, the field engineering, geological conditions and long-term mining activity are investigated. A numerical model is developed to simulate and analyze the failure and deformation process of the Pusa collapse. The failure factors of the Pusa collapse can mainly be attributed to the unique geology of the slope rock mass, underground mining activities, topography and rainfall. The intensified mining activities increased the compressive stress in the upper layers and caused the development of fractures and cracks. The failure process of the Pusa collapse can be summarized into three stages, namely: (1) deformation of the roof layers, (2) cracking on the crest of the slope, (3) rapid deformation and collapse. The upper slope with high strength rocks developed crack–toppling failure while the lower slope with low strength rocks developed crack–slide failure. In summary, the slope deformation and failure mechanism are tensional, toppling, and shear failure.
AB - The rock structures at Pusa Village, located in the karst mountainous area of Nayong County, Guizhou Province, China are gently dipping. The upper part of this mountain is composed of hard rock layers while the lower section is made up of soft rocks which includes six (6) coal seams. Mining the coal seams excited the rest of the slope body leading to instability of the upper portions. On August 28, 2017, a massive landslide occurred in this area which resulted in the generation of 82, 500 cubic meters of debris. Significant casualties and social impacts were recorded. Twenty-six (26) fatalities and nine (9) missing people were reported. In this paper, the field engineering, geological conditions and long-term mining activity are investigated. A numerical model is developed to simulate and analyze the failure and deformation process of the Pusa collapse. The failure factors of the Pusa collapse can mainly be attributed to the unique geology of the slope rock mass, underground mining activities, topography and rainfall. The intensified mining activities increased the compressive stress in the upper layers and caused the development of fractures and cracks. The failure process of the Pusa collapse can be summarized into three stages, namely: (1) deformation of the roof layers, (2) cracking on the crest of the slope, (3) rapid deformation and collapse. The upper slope with high strength rocks developed crack–toppling failure while the lower slope with low strength rocks developed crack–slide failure. In summary, the slope deformation and failure mechanism are tensional, toppling, and shear failure.
KW - Failure mechanism
KW - Failure process
KW - Numerical simulation
KW - PFC
KW - Underground mining
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M3 - Paper
T2 - 53rd U.S. Rock Mechanics/Geomechanics Symposium
Y2 - 23 June 2019 through 26 June 2019
ER -