赵固—矿16煤层切顶卸压沿空留巷技术研究

发布时间：2018-06-17 21:44

本文选题：沿空留巷 + 切顶卸压　；参考：《山东科技大学》2017年硕士论文

【摘要】：由于河南焦作煤业集团各矿区每年留设煤柱,大量浪费煤炭资源,由此进行沿空留巷工程可以减少甚至避免煤炭资源浪费现象的发生。本文主要以河南焦作煤业集团赵固一矿16011工作面为工程背景,针对该工作面下顺槽开展的切顶卸压沿空留巷项目,着重分析留巷过程中预裂切缝的设计,并针对已设计出的各预裂切缝进行数值模拟验证。结合PU监测系统反馈数据,分析设计方案的实际工程效果。本文采用理论分析、数值模拟、工程实践等技术手段对上述问题进行分析探讨,现得出以下主要结论:(1)传统的沿空留巷主要是通过在采空区侧采用木垛、巷道密集支护或是矸石充填以及混凝土充填来实现的。这些方式不到费事费力,成本高昂,而且护巷效果不甚理想,采用切顶卸压沿空留巷可以避免上述不足之处;(2)构建了传统长壁开采模式下沿空留巷及切顶卸压沿空留巷的力学模型,经过理论计算,得出切顶卸压沿空留巷在赵固一矿16011工作面理论上可行,并对比得出切顶卸压沿空留巷支承压力小于传统长壁开采模式下的沿空留巷的支承压力,支护成本小,安全可靠性高。(3)以实用矿山压力为依托,通过力学分析及数值模拟,确定顶板预裂切缝合理高度为9m,合理角度为15°,合理间距为600mm。采用此种设计可以使16011工作面采空区上覆岩层完全垮落,但是不影响沿空顺槽的围岩稳定性;(4)针对赵固一矿16011工作地质条件,对其留巷段在原有巷道支护形式的基础上进行了危险性分区,并对其进行了补强支护设计,结合切顶卸压技术手段达到留巷目的。(5)通过PU监测系统数据反馈分析可知:切缝顺槽侧工作面压力较小,工作面周期来压步距较大;原有巷道上方的应力逐渐向相邻工作面转移,使得留巷段巷道处于抵应力区,保证了所留巷道的围岩稳定性,此时巷道变形主要表现为顶板下沉,最大下沉量出现在切眼口处,需在此处进行补强支护。
[Abstract]:Because every mining area of Henan Jiaozuo Coal Industry Group keeps coal pillars every year, a large amount of coal resources are wasted, so the coal resource waste can be reduced or even avoided by the roadway retaining engineering along the goaf. Taking the 16011 face of Zhaogu No. 1 Coal Mine of Henan Jiaozuo Coal Industry Group as the engineering background, this paper focuses on the design of pre-split cutting joint in the course of retaining roadway. Numerical simulation is carried out to verify the designed pre-crack cutting joints. Based on the feedback data of pu monitoring system, the practical engineering effect of the design scheme is analyzed. In this paper, theoretical analysis, numerical simulation and engineering practice are used to analyze and discuss the above problems. The main conclusions are as follows: 1) the traditional roadway along the goaf is mainly through the use of wood stacking on the side of the goaf. Roadway dense support or gangue filling and concrete filling to achieve. These are less laborious, costly, and less effective in protecting alleys. The mechanical model of the traditional long wall mining model of the gob side and the cut top pressure release along the gob retaining roadway can be avoided by using the cutting top pressure relief roadway along the gob side, and the mechanical model of the traditional long wall mining mode is constructed, and the theoretical calculation is carried out. It is concluded that it is theoretically feasible to cut the top and release the roadway along the goaf and leave the roadway along the gob in Zhaogu No. 1 Coal Mine, and it is concluded that the supporting pressure of the cutting top relief along the gob retaining roadway is less than that of the traditional longwall mining mode, and the supporting cost is small. Based on practical mine pressure and mechanical analysis and numerical simulation, it is determined that the reasonable height, reasonable angle and reasonable spacing of roof pre-splitting joint are 9m, 15 掳and 600mm. By adopting this design, the overlying strata in goaf of No. 16011 face can collapse completely, but the stability of surrounding rock along the goaf can not be affected.) according to the working geological conditions of No. 16011 Zhaogu No. 1 Mine, On the basis of the original roadway support form, the dangerous zoning is carried out for the roadway retaining section, and the reinforcement support design is carried out. According to the data feedback analysis of pu monitoring system, it can be concluded that the pressure of the side face along the cutting joint is small, the pressure of the working face is larger; The stress above the original roadway is gradually transferred to the adjacent working face, which makes the roadway in the residual roadway in the stress zone, which ensures the stability of the surrounding rock of the remaining roadway. At this time, the roadway deformation is mainly shown as roof subsidence, and the maximum amount of subsidence occurs at the cut hole. Reinforcement support is needed here.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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