回采巷道全长树脂锚杆锚固力学特性研究

发布时间：2018-06-01 03:40

本文选题：锚杆锚固 + 扭矩　；参考：《安徽理工大学》2017年硕士论文

【摘要】：传统支护体系采用端头锚固或加长锚固锚杆支护效果差,难以控制复杂困难巷道条件下围岩的有害变形,而全长锚固锚杆具有其支护刚度高且对围岩变形和离层敏感的优点,能够有效防止巷道围岩的变形。本论文以煤矿回采巷道端头锚固和全长锚固锚杆支护为研究对象,采用理论分析、实验室试验及现场实测的综合研究方法,分析了端头锚固和全长锚固在不同预设参数条件下的锚固受力状态;在实验室设计建立了 1:1锚固拉拔实验系统,配合液压锚杆钻机及手动油压千斤顶,实现了垂直及水平荷载下2.5m全长树脂锚固拉拔试验,通过光纤光栅传感技术在锚杆中的测试应用,对锚杆进行受力监测,研究了在不同垂直压力、侧压系数、预紧力条件下,端头锚固和全长树脂锚固锚杆杆体轴力分布及承载特征;并且在煤矿巷道现场对光纤光栅测力锚杆进行受力监测,验证光纤光栅测力锚杆的应用效果。研究结果表明:在相同拉拔力条件下,当侧压系数不同时,围岩水平压力增大可以有效降低锚杆的轴力,其影响主要是集中于端头锚固支护初期和对全长锚固支护后期;增大扭矩可以提高端头锚固和全长锚固前期锚杆增阻速度和对围岩的压力。研究结果为煤矿回采巷道全长树脂锚固锚杆支护提供了一定的理论依据。
[Abstract]:In the traditional support system, it is difficult to control the harmful deformation of surrounding rock under complex and difficult roadway conditions because of the poor support effect of end Anchorage or extended Anchorage bolt, while the full-length Anchorage bolt has the advantages of high supporting stiffness and sensitivity to surrounding rock deformation and separation. It can effectively prevent the deformation of roadway surrounding rock. This paper takes the end Anchorage and the full-length Anchorage bolt support of coal mining roadway as the research object, and adopts the comprehensive research method of theoretical analysis, laboratory test and field measurement. The anchoring force state of the end anchoring and the full-length anchoring under different preset parameters is analyzed, and the 1:1 anchoring and drawing experimental system is designed in the laboratory, which is combined with the hydraulic anchor drill and the manual hydraulic Jack. The full-length resin anchoring and drawing test of 2.5m under vertical and horizontal loads has been realized. Through the testing and application of fiber Bragg grating sensing technology in anchor rod, the force of anchor rod has been monitored and studied under different vertical pressure, lateral pressure coefficient and pretightening force. The axial force distribution and bearing characteristics of the end Anchorage and the full-length resin Anchorage bolt are analyzed, and the force of the FBG force-measuring bolt is monitored in the coal mine roadway to verify the application effect of the FBG force-measuring anchor rod. The results show that under the same pull-out force condition, when the lateral pressure coefficient is different, the axial force of the bolt can be effectively reduced by increasing the horizontal pressure of surrounding rock, which is mainly concentrated in the early stage of the end head anchor support and the late stage of the full-length anchor support. The increase of torque can increase the resistance speed and the pressure on the surrounding rock of the anchor rod in the early stage of the end Anchorage and the full-length Anchorage. The results provide a theoretical basis for the full-length resin Anchorage bolt support of coal mining roadway.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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