浅埋煤层群开采的区段煤柱应力与地表裂缝耦合控制研究.

In order to investigate the coupling control of reducing coal pillar pressure concentration and realizing uniform surface subsidence to reduce surface cracks in shallow buried coal seams mining,the physical simulation and numerical calculation are employed.The interval strata breaking form,the concentrated stress distribution of coal pillars,the overburden and surface cracks and the ground surface subsidence in different coal pillar stagger distances are obtained.The relationship of the coal pillar stagger with the evolution of coal pillar stress concentration and of overburden fracture is discovered.According to the study,the determination of the reasonable upper and lower coal pillars stagger by interval layer breaking form can avoid the section coal pillar concentrated stress superposition and non-uniform strata subsidence in coal pillar supporting influence area,and realize the coupling control of stress and cracks in shallow coal seam group mining.In this paper,the control model of concentrated stress and ground crack of coal pillar group is established,and the coupling criterion to avoid the coal pillar concentrated stress and realize the uniform surface subsidence is put forward,so the mechanism of reducing the stress concentration of coal pillar and realizing the uniform subsidence of the ground surface is revealed. [ABSTRACT FROM AUTHOR]