基于分布式光纤传感技术的卸压钻孔时间效应研究

发布时间：2018-04-20 06:48

  本文选题：冲击地压防治 + 钻孔卸压　； 参考：《煤炭学报》2017年11期

【摘要】：以钻孔卸压原理及分布式光纤传感技术为基础,建立了卸压钻孔周边煤体内部应变感测模型,提出了以光纤拉伸应变值及卸压半径为指标的卸压效果评价方法。通过对传感光缆下方钻孔卸压周边煤体内部应变定期测试,并结合钻孔内部表观现象观测,根据不同时间钻孔周围煤体内部应变及表观破坏特征将钻孔卸压过程分为裂隙发育阶段、极限平衡阶段、塌孔阶段、破碎煤体压实阶段等四个阶段。分别确定了在忻州窑矿地质及开采条件下钻孔卸压过程中各阶段的时间区间,得出超前94~101 m以上施工钻孔,其卸压效果较为显著。利用微震监测系统,对比分析了卸压钻孔施工时间调整前后的微震事件分布特征,结果表明:当卸压钻孔施工达到超前工作110 m后,工作面周边高能量事件的频次明显减少、微震事件平均能量明显降低38%。
[Abstract]:Based on the principle of borehole pressure relief and distributed optical fiber sensing technology, the strain sensing model of coal body around the pressure relief hole is established, and the evaluation method of pressure relief effect based on the tensile strain value and the pressure relief radius of the fiber is put forward. The internal strain of the coal body around the pressure relief surrounding the borehole under the sensing fiber cable is measured periodically, and the apparent phenomenon of the borehole is observed in combination with the observation of the internal strain of the coal body. According to the internal strain and apparent failure characteristics of the coal body around the borehole at different times, the pressure relief process of the borehole is divided into four stages: fracture development stage, limit equilibrium stage, hole collapse stage and crushing coal compaction stage. The time intervals of each stage in the process of borehole pressure relief under the geological and mining conditions of Xinzhou Kiln Mine are determined respectively. The results show that the borehole drilling is more than 9410m ahead of the construction, and the pressure relief effect is more remarkable. By using the microseismic monitoring system, the distribution characteristics of microseismic events before and after the adjustment of the construction time of pressure-relief boreholes are compared and analyzed. The results show that the frequency of high-energy events around the working face is obviously reduced when the construction of pressure-relief boreholes reaches 110 m ahead of work. The average energy of microseismic events is significantly reduced by 38%.
【作者单位】： 辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金资助项目(51274117,51674135)
【分类号】：TD324
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本文编号：1776714