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A Study of the Large Deformation Mechanism and Control Techniques for Deep Soft Rock Roadways

by Xiaojie Yang 1,2,†, Eryu Wang 1,2,*,†, Yajun Wang 1,2, Yubing Gao 1,2 and Pu Wang 3,4,*
1
State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
2
School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
3
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
4
Department of Resources and Civil Engineering, Shandong University of Science and Technology, Tai’an 271000, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sustainability 2018, 10(4), 1100; https://doi.org/10.3390/su10041100
Received: 6 March 2018 / Revised: 30 March 2018 / Accepted: 4 April 2018 / Published: 6 April 2018
Large deformation control of deep soft rock roadways has been a major problem in mining activities worldwide. This paper considers the supporting problem related to large deformation of a deep soft rock roadway in Chao’hua coal mine. The discrete element simulation method (UDEC software) is adopted to simulate a tailgate of panel 31041 in Chao’hua coal mine. The failure patterns of unsupported and primary supported roadway are simulated, and these reveal the characteristics of deformation, stress and crack propagation. The excavation of roadway leads to high deviator stress, which exceeds the peak strength of shallow surrounding rock and causes it to enter the post-failure stage. Tensile failures then initiate and develop around the roadway, which causes the fragmentation, dilation and separation of shallow surrounding rock. The compressive capacity of the primary support system is low, which results in serious contraction in the full section of the roadway. An improved control scheme is put forward for the support of a tailgate. The underground test results confirm that the improved support system effectively controlled large deformation of the surrounding rocks, which can provide references for support in the design of roadways excavated in deep soft stratum. View Full-Text
Keywords: deep soft rock roadway; large deformation mechanism; control techniques; numerical simulation; underground test deep soft rock roadway; large deformation mechanism; control techniques; numerical simulation; underground test
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Yang, X.; Wang, E.; Wang, Y.; Gao, Y.; Wang, P. A Study of the Large Deformation Mechanism and Control Techniques for Deep Soft Rock Roadways. Sustainability 2018, 10, 1100.

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