大断面沿空留巷首采矿压观测研究.doc

大断面沿空留巷工作面初采矿压观测研究 张立武 （中煤国际工程集团沈阳设计研究院 辽宁 沈阳 110015） 摘要：针对18205工作面具体情况，对初采工作面沿空留巷充填体及煤体进行了矿压观测，研究了工作面及轨道运输巷的围岩应力和位移分布规律，得出工作面直接顶初次跨落步距在10-12m、老顶垮落步距在34m，充填体的承载性能力为外部的承载能力大于内部的承载能力；在老顶的初次断裂以及周期来压过程中巷道的压力会发生明显的变化，但在可控范围内；在工作面初采期间巷旁充填体能够有效地保证顶板的稳定性及完整性，充填体能够达到控制顶板下沉、适应顶板活动规律的要求，本论文为该类巷道围岩稳定性控制提供了依据。 关键字：大断面；沿空留巷；初采；矿压观测 Analysis on beginning of the mining face pressure observation of Big-section Retaining roadway for next sub-level ZHANG Li-wu (China Coal International Engineering Group, design and Research Institute of Shenyang，Liaoning province Shenyang City, Zip code：110000) Abstract: In 18205 face specific circumstances, For the primary mining face retain roadway for next sub-level, filling and the coal mine pressure observation The working face and rail transport lane of the surrounding rock stress and displacement distribution, initial pressurized distance in the first coal mining face was about 10-12m,The old roof collapse from 34m in step down, Filling the bearing capacity of the external sex of the bearing capacity of greater than the bearing capacity of the internal; In the old roof first fracture and periodic weight in the process of pressure change will happen, But manageable; At the beginning of working face during filling body can effectively ensure the stability and integrity of roof, Filling can achieve control of roof sinking, adapt to the requirements of the roof movement rule, and the paper provides a basis for This kind of surrounding stability control. Key words: Big-section; retain roadway for next sub-level.; primary mining; mine pressure observation 1 引言 一些发达国家在上世纪60年代就开始推行无煤柱开采的沿空留巷技术，随着沿空留巷技术的推广我国各大煤矿也在积极的推行这种先进的留巷技术，采用沿空留巷技术有利于解决工作面的瓦斯问题，使工作面安全程度大幅度提高[1-2]；实现了无煤柱开采，提高煤炭回采率，延长矿井服务年限；解决了生产衔接紧张问题，有利于工作面提前构成；实施沿空留巷“Y”型通风方式，为抽采钻孔布置参数优化提供了极为有利的条件，提高了抽采效果。所以沿空留巷技术对于缓解工作面采掘衔接紧张、有效提高煤炭资源回收率，降低掘巷成本，实现矿井安全、高效可持续发展有很重要的应用价值[3-5]。 2 工作面概况 山西王家窑矿8#煤层18205工作面井下位于南二盘区下组煤左翼，东与南二下组煤回风巷相接，西与南二轨道大巷相邻，北与18203工作面相邻，南部为18207掘进工作面，上部为2#煤的1