【作者】 孙强；

【导师】 马立强；

【作者基本信息】 中国矿业大学 ， 矿业工程， 2016， 硕士

【摘要】 论文针对急倾斜煤层开采覆岩活动规律和顶板控制的研究展开行文,结合新疆碱沟煤矿特厚煤层赋存的特征和地质条件,提出了针对于急倾斜煤层开采提出的保水开采概念,分析了急倾斜煤层的含水层和水源补给,并采用数值计算方法分析了影响保水开采导水裂隙通道的主要因素,并综合采用现场调研、理论分析以及现场的工业性实验的研究方法,对急倾斜特厚煤层的覆岩活动规律,坚硬顶板的控制技术以及特厚煤层的顶煤弱化技术进行了分析和研究。论文主要的研究内容如下:(1)分析了急倾斜煤层的含水层和主要补给水源,并针对于含水层的扰动破坏,通过数值计算方法分析了影响急倾斜煤层导水裂隙发育的几个主要影响因数和顶板的运移规律,并针对于三个补给水源采用了相关的措施进行保水(2)分析了碱沟煤矿在回采多个分段后,由于顶板悬露面积过大周期性性的来压很可能会造成工作面大的冲击事故。采用深孔顶板预裂爆破的顶板处理方式,对碱沟煤矿的4301和4501两个工作的爆破参数进行了计算和选择。并采用微震监测系统对深孔预裂爆破效果进行了检验。(3)碱沟煤矿顶煤坚硬,积聚较高的弹性能,应力集中放落困难。对特厚顶煤采取爆破弱化处理,保证顶煤的快速高效放落。为提高回采的速度,同时避免顶煤的放落造成顶板弹性能的积聚,提出对+518水平两工作面进行预裂爆破,根据实践对炮孔装药封孔参数不断优化。4501工作面夹矸较厚,回采期间对45号煤层进行注水软化,然后再进行顶煤的松动爆破。更多还原

【Abstract】 In this thesis, aiming at the study on the law of overlying strata movement and roof control of steep coal expand wording, combining with the occurrence characteristics and geological conditions of extra thick coal seam in Xinjiang Jiangou coal mine, putting forward the concept of water retaining mining in the mining of steep coal seam, the aquifer and supply water source of steep coal seam are analyzed. The main factors that influence the water flowing fractured channel are analyzed by numerical calculation method. The comprehensive study such as field research, theoretical analysis and field measurement are adopted to analyze and research the regularity of overlying strata activity in the steeply inclined and extra thick coal seam, hard roof control technology and top coal weakening technology of extra thick coal seam. The research results can be used as a reference for water resource conservation mining in steeply inclined coal seam. The main research contents of this paper are as follows:(1)The main factors that influence the water flowing fractured channel are analyzed by numerical calculation method, and the disturbance of the aquifer is disturbed. Based on the numerical calculation method, the main influence factors and the migration law of the roof of the water flowing fractured in the steeply inclined coal seam are analyzed. The relevant measures were adopted to protect the water from three supply water sources.(2) Due to the large roof hanging area over the period of the pressure is likely to cause a large impact accident on the working surface after mining multiple coal seams. The roof is weakened by the deep hole roof pre splitting blasting, the calculation and selection of blasting parameters for 4301 and 4501 work face in Jiangou coal mine are calculated and selected. Deep hole pre-splitting blasting effect has been tested by the microseismic monitoring system.It is easy to accumulate high elastic energy because the hard coal seam in Jiangou coal mine, and it is hard for top coal caving because of hard stress concentration. Weakening the special thick top coal by blasting to ensure the rapid and efficient fall of top coal. In order to improve the mining speed and avoid the accumulation of top coal caving and roof elastic properties, the pre splitting blasting is put forward for the two working face of +518 level. Water injection and softening of No. 45 coal seam are carried out during. the mining period because of the thickness dirt band in 4501 mining face, and then the top coal is to be blastedThis thesis contains 68 pieces of figures, 10 pieces of tables and 85 pieces of references.更多还原