哈拉沟矿切顶留巷切缝设计与工作面支承压力研究

发布时间：2018-07-12 17:30

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

【摘要】：神华神东矿区由于煤柱留设造成煤炭资源的大量浪费,为改善此问题采用切顶卸压沿空留巷工艺。针对神华神东哈拉沟煤矿12201工作面的切顶卸压无煤柱开采项目,分析其预裂切缝的关键参数,利用数值模拟验证设计的合理性;根据现场矿压监测数据,分析工作面支承压力的影响范围;对比分析常规留巷模式和切顶留巷模式的异同,计算二者顶板压力,得出各自支护强度的大小,从而判断两种留巷方式的优缺点。以实用矿山压力理论为基础、理论力学为依托,采用理论分析、数值模拟、工程实践等多角度对上述问题进行分析探讨,现得出以下主要结论:(1)对哈拉沟矿的工程地质条件进行分析研究,对切顶成巷进行理论分析,在前人研究的基础上构建力学模型,分析研究发现切顶留巷的成功关键取决于切缝的高度和角度,采用合理的切缝可以保证切顶留巷的成功;(2)针对哈拉沟矿12201工作面地质条件进行设计,采用最为适合该矿的预裂切缝,高度、角度、间距,采用此种设计可以达到采空区上覆岩层完全垮落,但不影响沿空顺槽围岩稳定性,对比其他高度、角度的切缝利用数值模拟分析切缝的可行性,发现哈拉沟矿最佳切缝高度为6m,最佳切缝角度为10°,最佳切缝间距为600mm;(3)本文系统性的阐述了对浅埋复合顶板薄煤层在切顶卸压沿空留巷过程中工作面支承压力影响,研究发现针对哈拉沟矿切顶卸压沿空留巷工程而言,采用切顶成巷工艺超前支承压力影响范围为25m左右,支承压力影响范围为90～150m左右;(4)经过理论计算之后发现,切顶卸压沿空留巷工艺比常规沿空留巷工艺支护强度小,同时安全可行性高,具有明显的优势。
[Abstract]:In Shenhua-Shendong mining area, coal resources are wasted because of coal pillar retention. In order to improve this problem, cutting top pressure relief technology along goaf is adopted. In view of the mining project of cutting roof and releasing pressure without pillar in 12201 face of Shenhua Shen-Donghalagou Coal Mine, the key parameters of its pre-splitting joint are analyzed, and the rationality of the design is verified by numerical simulation, and according to the monitoring data of mine pressure on the spot, This paper analyzes the influence range of supporting pressure in working face, compares and analyzes the similarities and differences between conventional retaining roadway mode and cutting top retaining roadway mode, calculates the roof pressure of both, obtains the magnitude of support strength, and judges the merits and demerits of two kinds of retaining roadway modes. Based on practical mine pressure theory and theoretical mechanics, the above problems are analyzed and discussed from many angles, such as theoretical analysis, numerical simulation, engineering practice, etc. The main conclusions are as follows: (1) the engineering geological conditions of Haagou Mine are analyzed, and the theoretical analysis of the roof cutting roadway is carried out, and the mechanical model is constructed on the basis of previous studies. It is found that the key to success of cutting top and retaining roadway depends on the height and angle of cutting joint, and reasonable cutting joint can guarantee the success of cutting top retaining roadway. (2) the geological condition of 12201 face in Hagagou Coal Mine is designed. Adopting the most suitable pre-crack cutting joint, height, angle, spacing, this design can achieve the complete collapse of overlying strata in goaf, but it does not affect the stability of surrounding rock along the goaf trench, compared with other heights. The angle of the slit is analyzed by numerical simulation. It is found that the optimum height of cutting joint is 6 m, the optimum angle of cut joint is 10 掳, and the optimum spacing of cutting joint is 600mm. (3) the paper systematically expounds the influence of the supporting pressure on the working face of shallow composite roof thin coal seam in the process of cutting and unloading along the gob roadway. It is found that the influence range of leading support pressure is about 25m and the influence range of supporting pressure is about 90 ~ 150m for the roadway engineering of Haagou Mine. (4) after theoretical calculation, it is found that the influence range of leading support pressure is about 25 m, and that the influence range of supporting pressure is about 90 ~ 150 m. (4) after theoretical calculation, it is found that, The technology of cutting the top and releasing the pressure along the gob retaining roadway has less support intensity and higher safety and feasibility than the conventional gob-side roadway technology, so it has obvious advantages.
【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】：TD322

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