松软煤层锚固孔底扩孔锚固机理及锚固性能研究
Study on anchoring mechanism and anchoring performances of bottom reaming for anchoring borehole in soft seam
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摘要: 针对松软煤层巷道锚杆锚固力低,制约松软煤层巷道锚杆支护技术发展的问题,采用锚固孔孔底倒楔形扩孔锚固提高锚杆的锚固性能,利用自行研发的锚固孔孔底单翼扩孔装置进行力学分析、实验室试验、相似模拟和井下现场试验,试验结果表明:松软煤层锚固孔孔底倒楔形锚固,可以使锚杆的锚固性能显著提高,尤其是锚杆达到最大锚固力后的残余锚固力提高近1倍,为松软煤层巷道锚杆支护的广泛应用提供了技术支持。Abstract: Acording to the problem that a low anchoring force of the bolt applied to the soft seam gateway.which restricted thebolt support technology development of thesof seam gatewaythe anchor hole anchoring afiter invered wedgereaming at the bottom of the borehole was proided to improve the anchoring perormancesof the bot. The mechanics anal ys lab experinent stmlar simulation and underground site experiment were conducted with the selif-developed bottom single wing device of the anchoring borehol .The experimentresulshowed that the reversed wedge anchoring of the botom in the anchoring oreholeof sof seam could obviousliymprove the anchoring peromances of the bo . E specally theresidual anchoring fovce of the bot was increased by nearly one time afer the bot reached the max anchoring force,and could provide the technical support to wide application of the bolt support applied to the soft seam gateway.
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