LAPSE:2019.0484
Published Article
LAPSE:2019.0484
Investigation of Deep Mine Shaft Stability in Alternating Hard and Soft Rock Strata Using Three-Dimensional Numerical Modeling
Xiaoming Sun, Gan Li, Chengwei Zhao, Yangyang Liu, Chengyu Miao
April 9, 2019
The problem of shaft instability has always been a major difficulty in deep mining practices. The shaft fracture has a high probability of being located near the aquifers and the soft⁻hard rock contact zone. This paper describes the deformation and stress characteristics of surrounding rock and the shaft lining under the interactive geological conditions under soft and hard rock strata in Anju coal mine, Shandong Province, China. Using the Method of Geological Strength Index (GSI ) and considering the rock-softening characteristics of water, the parameters of rock mass are calibrated. By means of the 3DEC-trigon method, the variation characteristics of surrounding rock and the shaft lining are simulated. After shaft excavation, under the condition of no support, shear failure and tensile failure occur in shallow surrounding rock shafts, and a pressure relief zone is formed. Shear failure is the main destruction mode in deep surrounding rock. Because of the different strengths of the surrounding rock, the deformation of the surrounding rock is significantly different. After the surrounding rock is softened by water absorption, the difference is magnified. The maximum shear stress and plastic zone appear near the interface between soft and hard rock. Under the condition of shaft lining support, uneven deformation of surrounding rock surely leads to nonlinear variation of pressure on the shaft lining. Under the action of an inhomogeneous pressure field, partial shear failure occurs in the shaft lining, and the shear failure area increases after the surrounding rock is softened by water. Because of the nonlinear deformation of the shaft lining, it is easy to produce stress concentration and bending moment near the interface between hard and soft strata. The control methods of advance grouting and pressure relief excavation are proposed to improve the stability of the shaft, and a good effect is gained.
Keywords
alternate strata, mine shaft, relief excavation, shaft lining, surrounding rock
Subject
Suggested Citation
Sun X, Li G, Zhao C, Liu Y, Miao C. Investigation of Deep Mine Shaft Stability in Alternating Hard and Soft Rock Strata Using Three-Dimensional Numerical Modeling. (2019). LAPSE:2019.0484
Author Affiliations
Sun X: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China; School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Li G: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China; School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Zhao C: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China; School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Liu Y: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China; School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Miao C: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China; School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
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Journal Name
Processes
Volume
7
Issue
1
Article Number
E2
Year
2018
Publication Date
2018-12-20
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7010002, Publication Type: Journal Article
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LAPSE:2019.0484
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doi:10.3390/pr7010002
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Apr 9, 2019
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CC BY 4.0
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Apr 9, 2019
 
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Calvin Tsay
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