蒋家河矿软岩轨道大巷“O”型支护技术研究与应用
发布时间：2018-10-26 15:17
【摘要】：随着开采深度的增加,软岩问题越来越突出,软岩巷道支护问题至今还没有完全解决,仍然是世界性难题,现有的支护理论与技术无法解决高应力泥化软岩巷道大变形问题。本文以蒋家河矿650m二采区轨道大巷为工程背景,采用了围岩岩石实验、理论分析、数值模拟、现场实测等多种研究方法,对软岩巷道支护机理与技术进行了系统研究,得出以下主要研究成果:1)探测分析了二采区轨道大巷围岩结构及围岩力学性质,得出了蒋家河矿二采区轨道大巷直接顶为泥岩和砂质泥岩,巷道围岩力学性质差,测定了二采区轨道大巷围岩松动圈范围,围岩属于大松动圈Ⅳ、Ⅴ型不稳定围岩。2)分析了软岩巷道变形破坏的影响因素及变性破坏的力学机理,得出了深部软岩巷道总体变形特征。深入研究了软岩巷道“O”型支护理论,提出了构建一次让压壳,合理预留让压空间及二次高阻支护的方案。3)根据预留让压空间经验公式,计算出二采区轨道大巷预留让压空间为22cm~44cm,二采区轨道大巷为高应力泥化软岩巷道,为让巷道围岩能够充分释放变形能,预留让压空间应稍取大些,综合因素分析,取预留让压空间数值为38cm。4)分析了不同锚杆长度与密度对软岩巷道围岩变形影响规律,确定了锚杆合理的支护长度及密度。即锚杆长度以1.6m为宜;锚杆支护合理密度为0.7m×0.7m,锚杆合理支护强度为60KN。5)确立了二采区轨道大巷一次支护时机与支护强度,二次支护时机与支护强度。其一次支护必须及时,支护强度为0.3MPa~0.4MPa;二次网壳衬砌支架支护强度为0.6MPa~0.816MPa,二次支护时机滞后一次支护20d。6)进行了工业性试验。从现场监测的结果可知,锚杆施工质量符合规范要求,巷道围岩变形量在预计的范围之内,网壳支架设计合理,网壳支架没有破坏,锚杆支护参数的选择较合理,预留让压空间能够满足巷道变形的需要。“O”型支护原理与技术,能够较好地控制大巷围岩有害变形。
[Abstract]:With the increase of mining depth, the problem of soft rock is more and more prominent. The problem of soft rock roadway support has not been completely solved, it is still a worldwide problem. The existing support theory and technology can not solve the problem of large deformation of soft rock roadway with high stress. Taking the 650m second mining area of Jiangjiahe Mine as the engineering background, this paper systematically studies the supporting mechanism and technology of soft rock roadway by using various research methods, such as rock experiment, theoretical analysis, numerical simulation and field measurement, etc. The main research results are as follows: 1) the surrounding rock structure and surrounding rock mechanical properties of the track roadway in the second mining area are investigated and analyzed, and it is concluded that the direct roof of the track roadway in the second mining area of Jiangjiahe Mine is mudstone and sandy mudstone, and the mechanical properties of the surrounding rock of the roadway are poor. The range of surrounding rock loosening zone of track roadway in the second mining area is determined. The surrounding rock belongs to the large loosening zone 鈪，
本文编号：2296139
[Abstract]:With the increase of mining depth, the problem of soft rock is more and more prominent. The problem of soft rock roadway support has not been completely solved, it is still a worldwide problem. The existing support theory and technology can not solve the problem of large deformation of soft rock roadway with high stress. Taking the 650m second mining area of Jiangjiahe Mine as the engineering background, this paper systematically studies the supporting mechanism and technology of soft rock roadway by using various research methods, such as rock experiment, theoretical analysis, numerical simulation and field measurement, etc. The main research results are as follows: 1) the surrounding rock structure and surrounding rock mechanical properties of the track roadway in the second mining area are investigated and analyzed, and it is concluded that the direct roof of the track roadway in the second mining area of Jiangjiahe Mine is mudstone and sandy mudstone, and the mechanical properties of the surrounding rock of the roadway are poor. The range of surrounding rock loosening zone of track roadway in the second mining area is determined. The surrounding rock belongs to the large loosening zone 鈪，
本文编号：2296139
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