摘要
本文分析了由于倾角变化 ,老顶沿轴向分力使其沿倾斜受力不均 ,直接顶冒矸向下滚落形成沿倾斜不同充填特征 ,急斜长壁开采工作面长度短 ,多种采煤方法边界不一 ,来压步距较大 ,很难形成沿走向的“砌体梁”结构。破断运动的复杂性 ,使工作面不同区域来压时序和强度有很大区别。通过对急斜长壁开采老顶破断规律相似模拟研究 ,初步归纳了顶板破断和破断后运动的特点。底板的破坏和滑移 ,加剧了“支架 -围岩”系统的不稳定性 ,岩层控制的难度比缓斜煤层大得多。
The features of ground pressure of overlying strata in steep coal seam mining are quite different from that in flat inclined coal seam, for example, the forces along overlying strata vary with the buried depth, the fall of immediate roof forms different type of backfilling due to different steep degree, the voussoir structure beams are normally not formed because of shorter coal face, various mining methods and larger weighted distance. The complexity of movement of broken overlying strata in steep coal seam mining leads to variation of ground pressure of overlying strata in time, location as well as intensity. Based on the lab experiment the paper describes the movement features of overlying strata in rupturing and after rupture. The failure and sliding of floor deteriorate the stability of system of support-surrounding rocks around coal face, so the strata control of steep coal seam mining is more difficult than that of flat coal seam mining.
出处
《矿山压力与顶板管理》
1999年第3期26-28,238,共3页
Ground Pressure and Strata Control
