厚煤层孤岛煤柱内合理掘巷位置及支护技术研究

发布时间：2018-04-12 11:48

本文选题：孤岛煤柱 + 巷道支护　；参考：《中国矿业》2017年04期

【摘要】：针对孤岛煤柱内掘巷位置及支护技术选择不当,极易导致巷道变形严重难以维护的问题,以新疆某矿为工程背景,运用数值计算的方法分析了厚煤层孤岛煤柱应力分布规律和孤岛煤柱内巷道的围岩变形特征。结果表明:孤岛煤柱在后开采工作面一侧的应力降低区宽度大于先开采的一侧;孤岛煤柱巷道在宽煤柱侧顶帮的围岩变形量显著高于窄煤柱侧,具有非均匀性。结合理论计算和数值分析结果,确定试验巷道的合理位置是在5 301采空区侧留设4.0m窄煤柱沿底板掘进。同时,针对孤岛煤柱内巷道围岩的非均匀变形特征及煤柱整体较破碎的特点,提出采用高强螺纹钢锚杆加长锚固和关键部位锚索加强支护相结合的非对称支护技术,经现场应用验证了方法和技术的有效性。
[Abstract]:In view of the improper selection of roadway position and supporting technology in the coal pillar of isolated island, it is easy to cause the roadway deformation to be seriously difficult to maintain, taking a certain mine in Xinjiang as the engineering background.The stress distribution law of isolated island coal pillar in thick coal seam and the deformation characteristics of surrounding rock in the roadway of isolated island coal pillar are analyzed by means of numerical calculation.The results show that the width of the stress reduction zone on the side of the coal pillar is larger than that of the side of the first mining face, and the deformation of the surrounding rock of the roadway on the side of the wide pillar is significantly higher than that on the side of the narrow coal pillar.Combined with the results of theoretical calculation and numerical analysis, it is determined that the reasonable position of the test roadway is to lay 4.0m narrow coal pillar in the side of 5301 goaf and drive along the floor.At the same time, in view of the non-uniform deformation characteristics of surrounding rock of roadway in the coal pillar of isolated island and the characteristics of the whole broken coal pillar, an asymmetric supporting technology is put forward, which combines the lengthening and anchoring of high strength steel bolt with the reinforcement of anchor cable in key position.The effectiveness of the method and technique has been verified by field application.
【作者单位】：新疆大学地质与矿业工程学院;神华新疆能源有限责任公司乌东煤矿;
【基金】：新疆维吾尔自治区自然科学基金项目资助(编号:2013211B08)
【分类号】：TD353;TD263

【参考文献】