期刊
ROYAL SOCIETY OPEN SCIENCE
卷 5, 期 8, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsos.180691
关键词
longwall mining; strain energy; floor heave; post-failure rocks; gateroads
资金
- National Natural Science Foundation of China [51704098, 51674101]
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology [SKLCRSM15KF03]
Floor heave in longwall gateroads is a severe issue that affects mining safety and efficiency. Researchers, however, have limited understanding on the floor heave mechanism because the deformation of post-failure rocks in the floor was seldom considered previously. In this study, we developed a theoretical model using the strain energy theory to investigate the post-failure deformation of rocks. This model was validated before being implemented into a numerical modelling package, FLAC(3D), for floor heave analysis. Based on a case study of a longwall entry employing a stiff-yield pillar configuration, we observe that massive floor heave occurs at the entry rib that takes less loads (yield pillar) and eventually propagates towards the other rib bearing a significant amount of loads (stiff pillar). This observation sheds light on the floor heave mechanism in longwall gateroads and has major implications for coal mine ground control.
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