摘要
针对浅埋煤层单一关键层长壁开采时顶板岩体结构的破断特征,建立了顶板岩体关键层塑性状态下的结构模型。利用机动法确定了老顶岩板初次来压时载荷的上限值和塑铰线的位置,得到了顶板岩体关键层的最小破断跨距。根据浅埋煤层初次来压期间顶板控制的关键区域在采区工作面中部的特点,探讨了空间顶板结构动态平衡下的特性,提出了老顶破断后塑性铰接体系非稳定的必充条件,给出了几何非线性结构在不同回转运动状态下的稳定性准则。
Based on the structural characteristics of single roof key stratum in shallow seam longwall face, the structural model of the roof key stratum in a state of plasticity is established. The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived. The dynamic equilibrium behavior of space roof structure is studied in accordance with longwall faces. Conditions both necessary and sufficient for instability of the main roof blocks is proposed after roof fracture. The stability criterion in different gyratory is given for geometrical nonlinearity structure.
出处
《矿山压力与顶板管理》
北大核心
2005年第2期7-9,共3页
Ground Pressure and Strata Control
