Research on mining-induced deformation and stress, insights from physical modeling and theoretical analysis
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ORIGINAL PAPER
Research on mining-induced deformation and stress, insights from physical modeling and theoretical analysis Guodong Li 1 & Shugang Cao 2 & Feng Luo 1 & Yong Li 2 & Yaxing Wei 1 Received: 18 October 2017 / Accepted: 30 January 2018 # Saudi Society for Geosciences 2018
Abstract The dynamic change of mining-induced stress is the main reason for large deformation of surrounding rock. To investigate the influence of mining-induced stress and deformation is important for appropriate supportive design. It also helps to raise the safety and productivity of longwall mining operations. In this paper, Weijiagou Coal Mine in Southwest China was selected as the case study. In order to research on the deformation and breakage of overlying strata, physical modeling test was carried out on the selfdeveloped rotatable physical similar test system. By using digital image correlation (DIC) technique, the deformation of strata and development of cracks in the process of coal seam excavation were acquired, meanwhile, mining-induced stress was also monitored by pressure cell and strainmeter. According to the mechanical structure of stope, the height of the destressed zone has a significant influence on stress distribution. In order to minimize the discrepancy between the physical model test and theoretical analysis, the dimension of the plastic zone of roadway was added into the mining panel width, and the gap between the experimental and theoretical results reduced. Keywords Mining-induced stress . Stress concentration . Strata deformation . Physical modeling
Introduction Coal seam mining causes redistribution of underground stress which is uniformly distributed in surrounding rock before coal seam excavation. Some area in stope become destressed (e.g., the strata above goaf), while the adjacent neighboring solid sections become stress-concentrated (e.g., the coal seam ahead of working face). Accordingly, it could be considered that there is in situ and mining-induced stress in surrounding rock after coal seam excavation (Singh and Singh 2010). Moreover, with working face advancing, the mining-induced stress dynamically changes both in space and in time. The distribution of mining-induced stress, especially the location
* Shugang Cao [email protected] 1
School of Mining and Geomatics, Hebei University of Engineering, Handan, Hebei 056038, China
2
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
and amount of maximum, is important for supportive design and safety production. But, it is not easy to make a clear understanding of it. The geological condition of strata, the value of in situ stress, and the mechanical properties of surrounding rock all have a significant influence on distribution mining-induced stress. Besides, the adopted mining technique, the dimension of mining panel, the advancing speed of working face, etc. are other important factors (Feng 2015). Generally, theoretical analysis, in situ test, physical modeling, and numerical simul
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