大直径玻璃钢锚杆工作面帮支护性能试验研究
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摘要
为解决瓦斯矿井采煤机截齿与钢质锚杆摩擦产生火花的问题,作者致力于用玻璃钢(FRP)锚杆代替钢制锚杆对巷道工作面帮进行支护,为此开展不同锚固方式条件下FRP锚杆力学性能试验研究;基于厚壁理论建立锚杆锚固力测试模拟模型,并进行实验室及现场应用试验。结果表明:27 mm的大直径FRP锚杆杆体抗拉力为278. 31 k N、抗剪切力为147. 94 kN,全锚固时杆体抗剪切力为282. 25 kN,满足矿井支护要求;实验室和现场试验拉拔力分别比螺纹钢锚杆高63%和31%,耗能值高24%;工作面帮采用FRP锚杆全锚支护,在锚杆间排距加大的条件下,支护效果仍优于原螺纹钢锚杆支护方案,可实现巷道安全支护。
To solve the problem that the friction between the shearer picks and the steel bolts in the gaseous mine production is easy to generate sparks,the paper was aimed at replacing steel bolts with FRP bolts to support the panel side. The mechanical properties of FRP bolts with different anchoring modes were studied. A simulation model was built for bolts anchorage force test based on thick walled cylinder theory,and laboratory and field tests were carried out. The results show that the 27 mm diameter FRP bolts rod tensile strength is 278. 31 kN and the shear strength is 147. 94 kN,when it is fully anchored,the shear strength of FRP bolts is 282. 25 kN,which can meet the basic requirements of the panel side of roadway support,that the values of pulling force of FRP bolts in laboratory and field tests are 63% and 31% more than those of rebar bolts respectively,and the energy consumption of FRP bolts is 24% higher than that of the rebar bolts,and that when panel side is supported with FRP bolts,even the bolts spacing and row spacing are increased,the supporting effect is still better than that of the steel bolts support scheme.
To solve the problem that the friction between the shearer picks and the steel bolts in the gaseous mine production is easy to generate sparks,the paper was aimed at replacing steel bolts with FRP bolts to support the panel side. The mechanical properties of FRP bolts with different anchoring modes were studied. A simulation model was built for bolts anchorage force test based on thick walled cylinder theory,and laboratory and field tests were carried out. The results show that the 27 mm diameter FRP bolts rod tensile strength is 278. 31 kN and the shear strength is 147. 94 kN,when it is fully anchored,the shear strength of FRP bolts is 282. 25 kN,which can meet the basic requirements of the panel side of roadway support,that the values of pulling force of FRP bolts in laboratory and field tests are 63% and 31% more than those of rebar bolts respectively,and the energy consumption of FRP bolts is 24% higher than that of the rebar bolts,and that when panel side is supported with FRP bolts,even the bolts spacing and row spacing are increased,the supporting effect is still better than that of the steel bolts support scheme.
引文
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[2]马振乾,姜耀东,左宇军,等.特厚泥质顶板巷道锚杆支护关键参数识别与应用[J].中国安全科学学报,2017,27(7):121-126.MA Zhenqian,JIANG Yaodong,ZUO Yujun,et al.Identification and application of key parameters of bolt support for roadways with extra-thick mudstone roof[J].China Safety Science Journal,2017,27(7):121-126.
[3]朱汉明,梅群力,陈清运,等.锚固剂玻璃钢锚杆支护工程力学特性与应用[J].武汉工程大学学报,2014,36(4):65-69.ZHU Hanming,MEI Qunli,CHEN Qingyun,et al.Engineering mechanics propertites and application of glass fiber reinforced polymer bolting with anchoring agent[J].Journal of Wuhan Institute of Technology,2014,36(4):65-69.
[4]李英明,马念杰,杨科.基于煤帮变形的玻璃钢锚杆失效机理分析[J].煤炭科学技术,2009,37(10):18-20.LI Yingming,MA Nianjie,YANG Ke.Analysis on failure mechanism of fiber reinforced plastics bolt based on mining gateway sidewall deformation[J].Coal Science and Technology,2009,37(10):18-20.
[5]龚韩林.爆破动载作用下玻璃钢锚杆力学响应特征研究[D].武汉:武汉科技大学,2016.GONG Hanlin.Study on the mechanical response characteristics of glass fiber reinforced plastic bolt under blasting dynamic Load[D].Wuhan:Wuhan University of Science and Technology,2016.
[6]江魏.基于PFC的玻璃钢锚杆应力分布规律及影响因素研究[D].淮南:安徽理工大学,2017.JIANG Wei.Study on the stress distribution law and influencing factors of glass fiber reinforced plastic bolt based on PFC[D].Huainan:Anhui University of Science&Technology,2017.
[7]纪国庆.玻璃钢锚杆扭转性能及锚固参数研究[D].淮南:安徽理工大学,2017.JI Guoqing.Study on the performance and parameters of torsion of FRP bolt[D].Huainan:Anhui University of Science&Technology,2017.
[8]康红普.我国煤矿巷道锚杆支护技术发展60年及展望[J].中国矿业大学学报,2016,45(6):1 071-1 081.KANG Hongpu.Sixty years development and prospects of rock bolting technology for underground coal mine roadways in China[J].Journal of China University of Mining&Technology,2016,45(6):1 071-1 081.
[9]CAO Chen,REN Ting,ZHANG Yidong,et al.Experimental investigation of the effect of grout with additive in improving ground support[J].International Journal of Rock Mechanics&Mining Sciences,2016,85:52-59.
[10]赵象卓,张宏伟,CAO Chen,等.不同围岩条件下锚杆肋间距与锚固力优化研究[J].岩土力学,2018,39(4):1 263-1 270.ZHAO Xiangzhuo,ZHANG Hongwei,CAO Chen,et al.Study on optimization of bolts rib spacing and anchoring force in different conditions of surrounding rock[J].Rock and Soil Mechanics,2018,39(4):1 263-1 270.
[11]YAZICI S,KAISER P K.Bond strength of grouted cable bolts[J].International Journal of Rock Mechanics&Mining Sciences,1992,29(3):279-292.
[12]KAISER P K,YAZICI S,NOSE J.Effect of stress change on the bond strength of fully grouted cables[J].International Journal of Rock Mechanics&Mining Sciences,1992,29(3):293-306.
[13]HYETT A J,BAWDEN W F,MACSPORRAN G R,et al.A constitutive law for bond failure of fully-grouted cable bolts using a modified Hoek cell[J].International Journal of Rock Mechanics&Mining Sciences,1995,32(1):11-36.
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