A working face end stress concentration factor acquiring method

工作面端头应力集中系数的获取方法

Abstract

The invention provides a working face end stress concentration factor acquiring method comprising the steps of: (1) establishing a mining area model after mining of a stope is stabilized; (2) acquiring the overburden failure height of the mining area; (3) acquiring the total gravity of overlying rock transfer; (4) acquiring the included angles between sufficient mining boundary lines in the inclination direction of a steeply dipping seam and the horizontal line; (5) acquiring pressure Fa1 working on a lower rock pillar body; (6) acquiring the stress [sigma] a in a coal body stress rising area and the vertical stress [sigma] a (v) at a coal body; (7) acquiring the stress concentration factor k. By establishing a mining area model and employing the law of conservation of energy in a closed system, a balance formula concerning the working face stress-relaxation area height, the overburden failure angle and the like is established and a solving method for the working face end stress concentration factor K is indirectly acquired. The solving method is great in applicability and can greatly improve the safety of working face mining when being applied to geometric calculation of stope structures.
本发明公开了一种工作面端头应力集中系数的获取方法,包括步骤:1)建立采场开采稳定后的采矿区模型,2)获取采矿区覆岩破坏高度;3)获取上覆岩层转移的总重力;4)获取大倾角煤层倾向方向充分采动边界线与水平线的夹角;5)获取作用于下部岩柱体的压力Fa1;6)获取煤体应力增高区内的应力σa和在煤体处的垂直应力σa(v);7)获得应力集中系数k。本发明通过建立采矿区模型,并利用在封闭系统内能量守恒定律,建立了关于工作面卸压区高度、覆岩破坏角度等的平衡公式,间接得出工作面端头应力集中系数K的求解方法,该求解方法能适用性较强,将其用于采场结构几何计算,能很大的提高工作面开采的安全性。

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