Strain energy analysis of floor heave in longwall gateroads

• Main Authors: Meng Wang, Dongjie Zheng, Kewei Wang, Wenfeng Li
• Format: Article
• Language: English
• Published: The Royal Society 2018-01-01
• Series: Royal Society Open Science
• Subjects: longwall mining; strain energy; floor heave; post-failure rocks; gateroads
• Online Access: https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.180691

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, FLAC3D, 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.