置孔释压材料在主应力巷道中的适应性研究
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摘要
通过对高应力软岩巷道破坏特征及原因的分析,建立了置孔释压支护模型,并对置孔释压的支护原理进行了力学和能量学的分析,提出了2种不同的置孔释压支护方式,同时利用FLAC~(3D)软件分析其支护效果。结果表明:当只有金属支架时,巷道底角的应力集中诱发底板及巷道两帮大面积的破坏,导致顶板垮落;当置孔释压材料置于金属支架底角时,一部分围岩应力通过金属支架的传递由释压材料释放,一定程度上缓解了巷道底板及两帮的破坏,但是支护效果有限;当置孔释压材料置于金属支架周围时,大部分围岩应力由材料的压缩变形所释放,围岩没有出现明显的破坏,底鼓程度也较轻,支护效果良好。最后,通过工业性实验,验证了置孔释压材料置于金属支架与围岩之间时,能有效维护巷道围岩的稳定性。
Through the analysis on the failure characteristics and causes of high-stress soft rock roadway,the model of hole pressure relief support was established.The mechanics and energetics analysis on the support principle of the hole pressure relief was carried out,two different hole release pressure support methods were proposed,and the support effect was simulated by FLAC~(3D).The results showed that when there was only metal support,the stress concentration at the bottom corner of the roadway induced large-scale damage of the floor and the both sides of roadway,which caused the roof to collapse.When the hole pressure relief material was placed at the bottom corner of the metal support,part of the surrounding rock stress was released by the pressure relief material through the transmission of metal support,and the damage of the floor and the both sides of the roadway was relieved to a certain extent,but the support effect was limited.When the pressure relief material was placed around the metal support,most of the surrounding rock stress was released by the compressive deformation of the material,and the surrounding rock did not show obvious damage.The bottom plate also showed a slight floor heave phenomenon,and the support effect was good.Finally,through industrial experiments,it was verified that the hole pressure relief material could effectively maintain the stability of the surrounding rock when it was placed between the metal support and the surrounding rock.
Through the analysis on the failure characteristics and causes of high-stress soft rock roadway,the model of hole pressure relief support was established.The mechanics and energetics analysis on the support principle of the hole pressure relief was carried out,two different hole release pressure support methods were proposed,and the support effect was simulated by FLAC~(3D).The results showed that when there was only metal support,the stress concentration at the bottom corner of the roadway induced large-scale damage of the floor and the both sides of roadway,which caused the roof to collapse.When the hole pressure relief material was placed at the bottom corner of the metal support,part of the surrounding rock stress was released by the pressure relief material through the transmission of metal support,and the damage of the floor and the both sides of the roadway was relieved to a certain extent,but the support effect was limited.When the pressure relief material was placed around the metal support,most of the surrounding rock stress was released by the compressive deformation of the material,and the surrounding rock did not show obvious damage.The bottom plate also showed a slight floor heave phenomenon,and the support effect was good.Finally,through industrial experiments,it was verified that the hole pressure relief material could effectively maintain the stability of the surrounding rock when it was placed between the metal support and the surrounding rock.
引文
[1]许广.平煤四矿深部软岩巷道围岩变形分析与控制技术研究[D].阜新:辽宁工程技术大学,2012.
[2]刘莉娜,韩芳.基于数值模拟软件的轨道下山优化设计[J].煤炭技术,2016,35(7):7476.
[3]孙雁新.深部高应力巷道破坏机理及置孔卸压支护技术研究[D].太原:太原理工大学,2018.
[4]孙雁新.深部高应力巷道破坏机理及置孔卸压支护技术研究[D].太原:太原理工大学,2018.
[5]尹光志,王登科,张东明.高应力软岩下矿井巷道支护[J].重庆大学学报(自然科学版),2007(10):8791.
[6]李彦斌.高应力软岩巷道置孔释压支护理论与技术研究[D].太原:太原理工大学,2013.
[7]安昌辉.深井综放开采沿空掘巷采动影响围岩变形机理研究[D].青岛:山东科技大学,2007.
[8]王震.正阳隧道围岩变形与支护结构受力特性研究[D].重庆:重庆交通大学,2009.
[2]刘莉娜,韩芳.基于数值模拟软件的轨道下山优化设计[J].煤炭技术,2016,35(7):7476.
[3]孙雁新.深部高应力巷道破坏机理及置孔卸压支护技术研究[D].太原:太原理工大学,2018.
[4]孙雁新.深部高应力巷道破坏机理及置孔卸压支护技术研究[D].太原:太原理工大学,2018.
[5]尹光志,王登科,张东明.高应力软岩下矿井巷道支护[J].重庆大学学报(自然科学版),2007(10):8791.
[6]李彦斌.高应力软岩巷道置孔释压支护理论与技术研究[D].太原:太原理工大学,2013.
[7]安昌辉.深井综放开采沿空掘巷采动影响围岩变形机理研究[D].青岛:山东科技大学,2007.
[8]王震.正阳隧道围岩变形与支护结构受力特性研究[D].重庆:重庆交通大学,2009.