采空区坚硬顶板破断机理与灾变塌陷研究

Study on fracture mechanism and catastrophic collapse of strong roof strata above the mined area

以坚硬顶板下的房柱式和条带式采矿工程为背景,建立了表征采空区内矿柱支撑顶板的弹性基础板力学模型,研究顶板不同阶段的破断模式与突变失稳的力学过程.研究表明:当煤柱的有效承载面积逐渐减小到临界值时,非线性控制参数即可穿越分岔点集,顶板位移突跳产生极限点失稳,煤柱-顶板系统出现突然塌陷失稳.

Based on the pillar-roof and strip pillar mining engineering beneath the strong roof strata, the mechanical model of a plate seated on the elastic foundation was established to analyze the failure process of the roof strata and its catastrophic collapse. The study shows that the non-linear control parameter can pass through the point-set of bifurcation when the effective load bearing area of pillars decreases to its critical value, resulting in the roof strata to produce a sudden jump of subsidence, the pillar-roof strata system becomes catastrophic collapse.