特厚煤层巷道锚杆锚索预紧力对支护结构稳定性的影响

发布时间：2018-04-23 02:07

本文选题：特厚煤层 + 预紧力　；参考：《煤矿安全》2017年04期

【摘要】：以金地煤业特厚煤层为背景,通过FLAC~(3D)数值模拟与工程实测分析研究了预紧力对特厚煤层巷道支护结构稳定性的影响。研究表明:锚杆预紧力增加可有效减少顶板浅部围岩离层,锚索预紧力的增加可使顶板浅部孤立的组合梁与深部承载拱有效耦合,合理施加锚索预紧力可使锚杆组合梁的承载能力提高113.74%;对于特厚煤层巷道,锚杆预紧力合理取值为60 kN,锚索为150 kN;预紧力过小时无法在顶板上方形成稳定的拱-梁承载结构,过大时则容易造成锚杆、锚索失效或破坏,造成结构失稳。工程实测表明,合理的预紧力可使巷道支护结构稳定,支护效果良好。
[Abstract]:Based on the thick coal seam of Jindi coal industry, the influence of pre-tightening force on the stability of roadway support structure in super-thick coal seam is studied by numerical simulation and engineering measurement. The results show that the increase of pre-tightening force of bolt can effectively reduce the displacement of shallow wall rock of roof, and the increase of pre-tightening force of anchor cable can effectively couple the composite beam with the deep bearing arch, which is isolated in shallow part of roof. The bearing capacity of Anchorage composite beam can be increased 113.74 by applying the pretightening force of anchor cable reasonably, the reasonable value of pretightening force of anchor rod is 60 KN and the anchor cable is 150 KN for the roadway of super thick coal seam, and the stable arch beam bearing structure can not be formed over the roof when the pretightening force is too small. When it is too large, it is easy to cause anchor rod, anchor cable failure or damage, resulting in structural instability. The measured results show that the reasonable pretightening force can make the roadway support structure stable and the support effect good.
【作者单位】：太原理工大学矿业工程学院;
【基金】：国家自然科学基金资助项目(51274145) 山西省自然科学基金资助项目(2015011066)
【分类号】：TD353

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