软弱煤岩体巷道围岩锚固力衰减特性研究

发布时间：2018-03-22 17:04

本文选题：软弱煤岩体　切入点：倒楔形扩孔锚固　出处：《中国安全生产科学技术》2017年06期 　论文类型：期刊论文

【摘要】：软弱煤岩体巷道围岩存在强度低、胶结程度差、遇水弱化等特点,正常树脂锚固时出现锚固力低、衰减速度快等问题,易造成巷道围岩严重变形破坏。利用自行研发的锚固孔底单翼倒楔形扩孔装置进行孔底扩孔锚固试验,分析了软弱煤岩体不同锚固状态下锚固力与位移的变化关系。试验结果表明:正常锚固和扩孔锚固状态下脱锚点发生前锚固力与位移曲线表现一致,脱锚点发生后正常锚固状态下残余锚固力瞬间衰减到几乎为0,而扩孔锚固状态下残余锚固力衰减程度较小,并出现残余锚固力大于脱锚力的情况;扩孔锚固状态下脱锚点处扩孔锚固的最大锚固力比正常锚固状态下平均提高2.8倍。软弱煤岩体锚固段发生脱锚界面为锚固剂与孔壁的交界面,脱锚后扩孔段锚固剂对倒楔形孔壁产生挤压破坏,从而提高了软弱煤岩体残余锚固力。试验结果为解决软弱煤岩体巷道锚网支护技术难题提供重要借鉴。
[Abstract]:The surrounding rock of soft coal and rock roadway has the characteristics of low strength, poor cementation degree, weakening in water, low anchoring force and fast attenuation speed during normal resin anchoring. It is easy to cause serious deformation and destruction of surrounding rock of roadway. The anchoring test of hole bottom reaming is carried out by using the self-developed single-wing inverted wedge reaming device of anchor hole bottom. The relationship between anchoring force and displacement in different anchoring states of soft coal and rock mass is analyzed. The experimental results show that the anchoring force and displacement curve of unanchoring point are consistent with each other in normal anchoring and reaming anchoring. The residual Anchorage force decreases to almost 0 in the normal anchoring state after the unanchoring point, while the residual Anchorage force in the reaming Anchorage state is smaller, and the residual Anchorage force is larger than the unanchoring force. The maximum anchoring force of reaming anchoring at reaming anchoring point is 2.8 times higher than that under normal anchoring condition. The unanchoring interface of weak coal and rock mass is the interface between anchoring agent and hole wall. The anchoring agent in the reaming section after unanchoring causes extrusion damage to the inverted wedge hole wall, thus increasing the residual anchoring force of the weak coal and rock mass. The test results provide an important reference for solving the technical problems of bolting and mesh supporting in the roadway of weak coal and rock mass.
【作者单位】：河南理工大学能源科学与工程学院;煤炭科学研究总院开采设计研究分院;煤炭安全生产河南省协同创新中心;
【基金】：河南省科技厅科技攻关项目(162102210224) 河南省教育厅科技攻关项目(15B440002)
【分类号】：TD353

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