【摘要】 煤炭开采导致采场上覆岩层形成特定的空间结构,在传统矿压理论中,人们提出了悬臂梁,铰接岩梁,预成裂隙梁以及砌体梁模型等来研究采场顶板的破坏规律和矿压显现问题.但用梁模型来研究采场顶板问题具有相当的近似性.本文将采场坚硬顶板视为弹性薄板,并考虑采场初次来压和周期来压时特定的边界条件,利用位移变分法从理论上分析了顶板的内力分布规律和破断机理,给出了确定顶板初次和周期垮落步距的理论计算式.更多还原

【Abstract】 Coal exploitation makes overlying strata of stope form particular spatial structures.In the traditional theory of ground pressure,models such as cantilever beam model,articulated rock beam model,pre-formed fracture beam model,and voussior beam model are used to study the fracturing rules of stope roof and the strata behaviors.But the beam model is an approximate model in studying the roof problems.In this paper,we regard the roof is treated as an elasticity sheet to study the distribution rules of stress and fractureing mechanism of the stope roof while considering the boundary conditions of the initial ground pressure or the periodical ground pressure.And the theoretical expression of the first and periodical span of the roof is obtained.更多还原