爆破动载下强冲击危险巷道锚杆轴力定量损失规律的试验研究

发布时间：2018-03-05 12:44

本文选题：强冲击危险巷道　切入点：爆破卸压　出处：《煤炭学报》2016年05期 　论文类型：期刊论文

【摘要】：针对目前冲击地压矿井卸压爆破参数常不合理导致支护损伤,降低防冲效果的问题,采用锚杆无损检测系统在井下强冲击危险巷道进行现场原位试验研究,定量化分析了爆破动载下锚杆轴向工作阻力的定量损失规律。通过分析,获得了不同药量的爆破导致锚杆轴力损失的影响程度及空间范围。发现了爆破药量不小于6 kg时,随至震源距离的增大锚杆轴力的平均损失率基本呈乘幂关系衰减,但也存在局部突增的可能。同时爆破下锚杆轴力损失是与锚杆方位相关的,距震源越近与锚杆方位的相关性越显著。随着爆破药量的增大锚杆轴力损失率升高,药量越大升高速度越快。通过分析发现,众多影响因素中至震源的距离和锚杆方位只是表层因素,而爆破药量和煤体性质才是核心因素,并且核心因素间也存在相互影响。综合考虑爆破下锚杆轴力损失规律以及煤层爆破的卸压效果,优化了内蒙某矿强冲击危险巷道爆破卸压参数,现场应用效果理想。由此建立了冲击地压矿井煤层卸压爆破参数优化的现场原位试验方法。
[Abstract]:In view of the problem that the parameters of pressure-relief blasting often lead to the damage of support and reduce the effect of anti-scour at present, the in-situ test and study of rock bolt nondestructive testing system is carried out in the underground roadway with strong impact and danger. Quantitative analysis is made on the law of quantitative loss of axial working resistance of anchor rod under blasting dynamic load. Through the analysis, the influence degree and space range of axial force loss of anchor rod caused by blasting with different explosive amount are obtained. It is found that the blasting charge quantity is not less than 6 kg. With the increase of the distance from the earthquake source, the average loss rate of the axial force of the bolt decreases in a power relationship, but there is a possibility of local sudden increase. At the same time, the loss of the axial force of the anchor rod is related to the orientation of the anchor rod under blasting. The closer the earthquake source is, the more significant the correlation between the anchor rod orientation and the explosive source is. With the increase of blasting charge, the rate of loss of axial force of anchor rod increases, the larger the charge quantity is, the faster the increase speed is. Through analysis, it is found that, The distance from the source to the earthquake source and the orientation of the anchor rod are only surface factors, but the blasting charge and the nature of the coal body are the core factors. Considering the law of bolt axial force loss under blasting and the pressure relief effect of coal seam blasting, the blasting pressure relief parameters of a strong impact dangerous roadway in Inner Mongolia are optimized. The field application effect is ideal, and a field in situ test method is established to optimize the blasting parameters of the coal seams under the impact ground pressure.
【作者单位】：煤炭科学研究总院开采设计研究分院;天地科技股份有限公司开采设计事业部;
【基金】：国家自然科学基金青年基金资助项目(51204097) 中国煤炭科工集团有限公司科技创新基金资助项目天地科技“公司开发项目”资助项目(KJ-2015-TDKC-11)
【分类号】：TD353.6

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