大倾角煤层柔性护巷特性及应用研究  

The characteristics and application of flexible support technique for a roadway in deeply inclined coal seam

作　　者：张宇宁[1] 唐建新[1] 陈宇龙[2] 李国栋[1] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]东京大学土木工程系

出　　处：《采矿与安全工程学报》2017年第3期542-548,555,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51204217);重庆市研究生科研创新项目(CYB14008)

摘　　要：在坚硬顶板条件下大倾角综采工作面的沿空留巷,矿压显现剧烈、巷道断面大、顶板跨度大、煤壁破碎、矸石下行冲击大,给留巷工作造成较大困难。通过理论分析、相似模拟及现场实测研究,探究了大倾角煤层巷道围岩运动规律及力学特性,提出针对大倾角中厚煤层坚硬顶底板综采开采条件下的柔性护巷支护系统方案,并进行了现场工业性实验。结果表明:下帮煤壁采用封闭式支护方式,能够减少留巷期间煤壁的破坏,充分发挥煤壁支撑能力;顶板的载荷转移支护方式,能够有效降低巷内采动压力;采空区内采用挡矸支护,能够有效抵挡矸石冲击力,且采用该方式在巷旁形成矸石堆积体能够形成较大的约束阻力。通过柔性护巷支护技术,获得了较好的围岩控制效果,为大倾角煤层沿空留巷工艺选项设计提供了依据。Under the conditions of deeply inclined fully mechanized coal face with hard roof, the gob-side entry retaining will be confronted with issues as intense rock pressure, large drift section, long roof span, broken coal wall, and large downward impact of gangue, which makes retaining difficult. Through theoretical analysis, simulation experiment and field measurement, movement behaviors and mechanical characteristics of surrounding rock of roadway were studied, and a flexible support tech- nique for roadway in deeply inclined and medium-thick coal seam with hard roof and floor under fully mechanized mining was put forward and verified through field industrial tests. Results have shown that the application of closed-end support in the lower part of coal wall can reduce the damage and give full paly to the supporting capacity of coal wall; the load-transfer support method in the roof can effectively reduce the mining pressure in the roadway; the rock support in gob can effectively resist the impact of gangue and the stacked gangue can provide a larger restraining force for roof. The application of this type of flexible support technology can achieve good control over the surrounding rocks and provide base for the design of gob-side entry retaining under the conditions of deeply inclined fully mechanized coal face with hard roof.

关 键 词：大倾角煤层 沿空留巷 矸石充填 相似模拟 

分 类 号：TD353[矿业工程—矿井建设]