采空区坚硬顶板破断机理与灾变塌陷研究

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.

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

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.