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Geomechanics and Engineering
  Volume 11, Number 3, September 2016, pages 401-420
DOI: http://dx.doi.org/10.12989/gae.2016.11.3.401
 


Analysis of the failure mechanism and support technology for the Dongtan deep coal roadway
Miao Chen, Sheng-Qi Yang, Yuan-Chao Zhang and Chuan-Wei Zang

 
Abstract
    The stability of deep coal roadways with large sections and thick top coal is a typical challenge in many coal mines in China. The innovative Universal Discrete Element Code (UDEC) trigon block is adopted to create a numerical model based on a case study at the Dongtan coal mine in China to better understand the failure mechanism and stability control mechanism of this kind of roadway. The failure process of an unsupported roadway is simulated, and the results suggest that the deformation of the roof is more serious than that of the sides and floor, especially in the center of the roof. The radial stress that is released is more intense than the tangential stress, while a large zone of relaxation appears around the roadway. The failure process begins from partial failure at roadway corners, and then propagates deeper into the roof and sides, finally resulting in large deformation in the roadway. A combined support system is proposed to support roadways based on an analysis of the simulation results. The numerical simulation and field monitoring suggest that the availability of this support method is feasible both in theory and practice, which can provide helpful references for research on the failure mechanisms and scientific support designing of engineering in deep coal mines.
 
Key Words
    numerical modeling; deep coal roadway with large section and thick top coal; failure mechanism; crack propagation; combined support system
 
Address
(1) Miao Chen, Sheng-Qi Yang, Yuan-Chao Zhang:
State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, P.R. China;
(2) Miao Chen, Chuan-Wei Zang:
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266510, P.R. China.
 

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