张集煤矿煤层瓦斯抽采钻孔合理封孔深度研究

发布时间：2018-06-27 21:34

本文选题：瓦斯抽采 + 穿层钻孔　；参考：《安徽理工大学》2017年硕士论文

【摘要】：瓦斯在煤矿生产过程中严重威胁煤矿的安全高效生产,瓦斯抽采是治理瓦斯问题关键的方法之一,通过瓦斯抽采不仅可以减少安全隐患,还可以实现瓦斯有效利用,有利于环境保护。而钻孔抽采又是抽采方法其中一种。钻孔抽采主要依托于打钻与封孔来完成,封孔质量的好坏严重影响瓦斯抽采效果,目前瓦斯抽采钻孔封孔质量差,致使钻孔抽采瓦斯浓度低,钻孔有效抽采时间不长,为了提高瓦斯抽采浓度与抽采效率,所以钻孔封孔是瓦斯抽采中非常关键的一环,而封孔深度对瓦斯抽采来说非常关键。通过查阅大量的参考文献,本文综合分析瓦斯抽采钻孔封孔深度的影响因素以及与钻孔周围应力分布状态的关系,钻孔在成型以后也与巷道类似,周围会形成"三带"(卸压带、应力集中带与原始应力带),分析得到了瓦斯抽采钻孔的封孔深度要超过煤层卸压带,进入应力集中带或原始应力带。针对不同煤矿地质条件下的煤层,要首先计算出煤层卸压带与应力集中带的区域范围,才可以准确确定瓦斯抽采钻孔的合理封孔深度。通过对张集矿13-1煤所在的1123(3)底抽巷煤岩样的物理力学性能各项参数的统计与计算,应用FLAC3D数值模拟软件模拟钻孔形成过程,结合前面理论分析从而得出塑性区与应力集中带区域,进行现场应用,并将运用了不同的封孔方式与封孔深度所测得的瓦斯数据进行对比分析,最终确定了13-1煤的合理封孔深度为8～10m。
[Abstract]:In the process of coal mine production, gas extraction is one of the key methods to control the gas problem, which can not only reduce the hidden danger of safety, but also realize the effective utilization of gas. In favor of environmental protection. Borehole extraction is one of the extraction methods. Borehole extraction mainly depends on drilling and sealing hole to complete, the quality of sealing hole seriously affects the effect of gas drainage. At present, the quality of gas drainage borehole is poor, resulting in low gas concentration in borehole extraction, and the effective extraction time of borehole is not long. In order to improve the concentration and efficiency of gas extraction, hole sealing is a very important part in gas extraction, and the depth of sealing hole is very important to gas extraction. By consulting a large number of references, this paper synthetically analyzes the influence factors of the hole sealing depth of gas drainage borehole and the relationship with the stress distribution state around the borehole. The borehole is similar to the roadway after forming, and the "three zones" (pressure relief zone) will be formed around the borehole. From the analysis of the stress concentration zone and the original stress zone, it is concluded that the hole sealing depth of the gas drainage borehole is higher than that of the coal seam relief zone and enters the stress concentration zone or the original stress zone. In view of the coal seams under different geological conditions, it is necessary to first calculate the regional range of the pressure relief zone and the stress concentration zone in the coal seam, in order to accurately determine the reasonable sealing depth of the gas drainage borehole. Based on the statistics and calculation of the physical and mechanical properties of the 1123 (3) bottom roadway coal samples of Zhangji 13-1 coal mine, the formation process of boreholes was simulated by using FLAC3D numerical simulation software. Combining with the previous theoretical analysis, the plastic zone and the stress concentration zone are obtained for field application, and the gas data obtained by using different sealing methods and sealing depth are compared and analyzed. Finally, the reasonable sealing depth of 13-1 coal is determined to be 810m.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.6

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