Mining and Design Branch,China Coal Research Institute Department of Mining and Design,Tiandi Science and Technology Company Limited

针对目前参数不合理的卸压爆破常损伤巷道围岩,减弱防冲效果的问题,基于PASAT-M型便携式微震系统实测的卸压爆破振动参数,并引入爆源模型对爆破震源进行描述,由此在FLAC3D4.0平台上研究了卸压爆破下巷道围岩的损伤破坏模式以及锚索支护的振动特征。研究发现:剪切破坏是爆破振动下巷道围岩的主要破坏模式。爆破振动下近场围岩应力水平出现小幅增加,其中顶板内水平应力增幅约为8%,爆破帮内垂直应力增幅在8.3%,爆破后近场围岩的弹性应变能得到一定的释放。卸压爆破通过造成支护结构锚固段附近煤体变形损伤,而导致锚索支护轴力的降低。利用三维全景钻孔窥视方法对巷道围岩裂隙带进行现场实测,验证了数值模拟结果的可靠性。

According to the pressure release blasting caused the mine roadiway surrounding rock falre and the bumping prevention effect reduced problems dueto the rational parameters based on the pressure release blastig vibration parameters measured with a PASAT-M mode portable microseismic system a blasting source model was applied to state the blasting vibration sources. Therefore a damage and falure model of the mine roatway surounding rock and the anchor supor seismic featres were studied on the FLAC3D4.0 platform.The study found that the shearing failre was the major falire mode of the mine roadvay surounding rock undert the blasting vibration. Under the blasting vibration,the stess level ofthe surrounding rock nearoy had small increasing.Among them.the horizonal tress wihn the roof was increased by 8%.the verical stess withn the blated sidewall vas increased by 8.3% and the elastic strain of the surounding rock near by was certainly released aner the blasting operation.The pressurereleased basting would cause theseam deformation and damage near the baoting secton of the support structure and would cause th axis force redvced of the anchor support Dil cene borescope method was applied to the site measurement on the cracking zoneof the mine roacwaysurrounding rock and the reliability of the numerical simulation results was verified.

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(KJ-2015-TDKC-05,KJ-2015-TDKC-11)；