Wang Meng, Zheng Dongjie, Wang Kewei, Li Wenfeng
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, People's Republic of China.
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu, People's Republic of China.
R Soc Open Sci. 2018 Aug 8;5(8):180691. doi: 10.1098/rsos.180691. eCollection 2018 Aug.
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, 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.
长壁采场巷道底臌是一个严重影响采矿安全与效率的问题。然而，由于之前很少考虑底板破坏后岩石的变形，研究人员对底臌机制的了解有限。在本研究中，我们运用应变能理论建立了一个理论模型，以研究岩石破坏后的变形。该模型在被应用于数值模拟软件FLAC进行底臌分析之前得到了验证。基于一个采用刚性-屈服柱配置的长壁巷道的案例研究，我们观察到在承受较少载荷（屈服柱）的巷道帮处出现了大量底臌，最终向承受大量载荷的另一帮（刚性柱）扩展。这一观察结果揭示了长壁采场巷道底臌的机制，对煤矿的地压控制具有重要意义。
