顶板中软弱夹层对巷道稳定性影响研究

On soft interlayer affecting roadway stabilization in roof

巷道顶板中含有软弱夹层,它的位置和厚度是影响顶板稳定性的重要因素.结合岩石力学、材料力学知识,采用理论分析、数学计算等综合方法,以层状复合岩梁为基础,通过铰接岩梁稳定性分析,对软弱夹层的厚度、位置对顶板稳定性的影响进行研究.得出了当组合梁的中间软弱夹层厚度一定时,随着软弱夹层离顶板越来越远,顶板所受的最大拉应力也越来越小,而且曲线规律变化的结论;同时推导出了岩层厚度与稳定跨距的关系,确定离层跨距为稳定性判别指标.将研究成果应用于实践,取得了很好的效果.

The location and thickness of weak interlayer in roof are important factors to affect roof stabilization. Utilizing the knowledge of rock mechanics, materials, mechanical and synthetic approach including theoretical analysis, mathematical calculations, and based on layered composite rock beam through analysis hinge rock beam stability, this paper makes researches on the location and thickness of the soft interlayer effect roadway roof stability. It comes to a conclusion that the roof suffers the maximum tensile stress getting smaller and smaller due to the weak interlayer farther and farther away from the roof, and it obeys the law of curve change when the weak interlayer thickness of composite beam in the middle layer is constant; It also deduces that the relationship between rock thickness and stability span, determine to put the delamination span as the stabilization index. The research results has been used in practice, which has achieved good results.