水平煤层巷道煤帮稳定性分析

Stability Analysis of Sidewalls of Horizontal Coal Drifts

为分析煤巷煤帮的稳定性,将巷道顶板视为梁,煤帮弹性区视为弹性基础,煤帮塑性区垂直应力视为作用在梁上的载荷,建立了考虑顶板和煤帮相互作用的煤帮稳定性分析力学模型,应用梁理论和弹塑性极限平衡理论推导了顶板弯曲方程和煤体中的应力表达式,采用数值方法确定煤帮塑性区宽度,根据顶板下沉量估算煤帮的水平位移,从而提出了一种预测煤巷煤帮稳定性的方法,并给出了算例,验证了分析结果的合理性.

In order to analyze the stability of sidewalls of coal drifts, the roof was seen as a beam, the elastic zone in sidewalls as an elastic foundation, the vertical stress of the plastic zone in sidewalls as loading, a mechanical model considering the interaction between the roof and sidewalls was created for stability analysis of sidewalls. The inflection equation of roof and stress formula of sidewalls were derived with the principle of beam and the elastoplastic limit equilibrium theory, the width of plastic zone in sidewalls was determined with numerical method, and the horizontal displacement of sidewalls was estimated according to the sinkage of roof; thus, a method for anticipating the stability of sidewalls of coal drifts was proposed. Finally, an engineering example was given so that its rationality was verified. 5figs., 1tab., 11refs.