【摘要】 根据浅埋深特厚煤层综放开采采高大,采空区垮落矸石不充分,不能有效支撑老顶岩梁,造成老顶架后切落的特点,建立了老顶断裂力学模型,利用断裂力学理论推导了老顶的断裂步距和支架的合理工作阻力.结果表明,老顶的断裂步距不仅与老顶的岩性特征和上覆岩层的荷载有关,而且与支架的工作阻力和水平挤压力有关.对平朔安家岭地下矿综放开采支架合理工作阻力进行分析,理论结果和实测结果比较一致.更多还原

【Abstract】 Based on the high mining height of fully-mechanized top-coal caving in shallow thick coal seam and the few falling waste rock in goal, the key roof can not be supported effectively,the facture mechanical model of key roof was established.The fracture step of key step and reasonable working resistance of support were obtained by using fracture mechanics.The results show that the fracture step of key roof relate to not only the mechanical character of key roof and the load of overlaying rock seam,but also the working resistance of support and horizontal pressure in key roof.The reasonable working resistance of support was analyzed in Anjialing coal mine,Pingshuo City.The theoretical results are well agreeable with the on-the-spot results.更多还原