卸压钻孔对巷道煤体卸压效应的数值分析及应用

发布时间：2018-01-04 08:34

本文关键词：卸压钻孔对巷道煤体卸压效应的数值分析及应用　出处：《煤炭工程》2016年11期 　论文类型：期刊论文

【摘要】：为研究卸压钻孔对巷道煤体卸压效应的作用,通过FLAC~(2D)数值模拟软件,分别模拟不同埋深条件下钻孔直径以及钻孔间距对钻孔卸压效果的影响。研究结果表明:1在实施钻孔卸压之后,钻孔左右两侧应力集中,钻孔上下两侧形成应力降低区;同时,钻孔孔径越大,钻孔卸压效果越好;钻孔间距越小,卸压效果越好;2相同钻孔孔径进行卸压,钻孔间距较小时卸压带高度和煤层埋深基本成正比例关系,随着钻孔间距的增大,卸压带高度基本不随埋深的变大而变化;3相同的钻孔参数进行钻孔卸压,煤层埋深越大卸压效果越好,同时为了更好地防治冲击矿压,不同的埋深的煤层应选择合理的钻孔参数。将模拟分析结果应用到徐庄煤矿7192工作面,起到了很好的卸压效果。
[Abstract]:In order to study the effect of pressure relief drilling on the relief effect of roadway coal body, the numerical simulation software FLACU 2D was used. The effects of borehole diameter and borehole spacing on the borehole pressure relief under different burying depth were simulated respectively. The results show that the stress concentration on the left and right sides of the borehole is concentrated after the implementation of the borehole pressure relief. The stress reduction zone is formed on the upper and lower sides of the borehole; At the same time, the bigger the hole diameter is, the better the pressure relief effect is. The smaller the borehole spacing, the better the pressure relief effect; (2) for the same borehole diameter, the pressure relief zone height is proportional to the coal seam depth when the borehole spacing is small. With the increase of the borehole spacing, the pressure relief zone height basically does not change with the increase of the buried depth; (3) with the same drilling parameters, the greater the buried depth of coal seam, the better the pressure relief effect, and at the same time, in order to better prevent and cure the impact rock pressure. Reasonable drilling parameters should be selected for different buried coal seams, and the simulation analysis results are applied to the 7192 face of Xuzhuang Coal Mine, which has a good pressure relief effect.
【作者单位】：上海大屯能源股份有限公司徐庄煤矿;中国矿业大学矿业工程学院;煤炭资源与安全开采国家重点实验室;
【基金】：国家自然科学基金青年科学基金项目(51204165) 国家“十二五”科技支撑计划(2012BAK04B06) 江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
【分类号】：TD322
【正文快照】： 近年来,随着矿井开采的深度逐渐加大,越来越多的矿井出现冲击矿压现象。冲击矿压[1]是矿井开采过程中发生的煤岩动力现象之一,它是指在矿井开采过程中,井巷或回采工作面周围的煤岩体在其力学平衡状态破坏时,由于瞬时弹性能的释放而产生急剧、猛烈的动力现象,现已越来越成为矿

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