大孤岛工作面区域性剪切破坏冲击机理研究

孤岛工作面由于受到两侧采空区侧向支承压力的共同影响,冲击危险性高于普通工作面,因此极易引发整体失稳冲击。虽然采用大孤岛工作面开采可以有效避免该类冲击的发生,但仍然存在局部冲击危险。为了研究大孤岛工作面的局部冲击特性,通过建立力学模型分析煤体内部的三向应力状态,由微元煤体的剪切破坏进一步推导得出区域煤体的剪切破坏准则,并提出大孤岛工作面区域性剪切破坏冲击的判据。该研究结果为大孤岛工作面开采提供了理论依据。

Study on Mechanism of Local Shear Failure for Large Isolated Working Face

As isolated working face is influenced mutually by side abutment pressure of goaf at both sides, the risk of rockburst is extremely higher than that in the general working face, so it is more likely to induce rock burst with the whole in-stability. Although large island faces can effectively avoid such accidents, there still exists local rock burst. Aiming at study the characteristics of the local rock burst of large isolated working face, it would be able to analyze the three-dimensional stress state within coal seam through building the mechanical model, further deduce the principles of shear failure of local coal from the shear failure of infinitesimal coal and propose the criteria for local rock burst occurring in large isolated working face. The research results provide a theoretical basis for mining large isolated working face.