全长锚固玻璃钢锚杆应力分布规律及影响因素研究
|
摘要
为揭示全长锚固玻璃钢锚杆界面应力传递规律,进行玻璃钢锚杆全锚模型试验,获得锚杆拉拔试验轴力和剪应力分布规律;采用PFC颗粒流数值模拟软件对锚杆应力分布规律进行细观研究,得到锚杆所受荷载、锚固剂弹性模量和锚杆弹性模量对锚杆应力分布影响规律。结果表明:在弹性黏结阶段,锚杆拉拔端口到锚固末端剪应力大小呈先增后减的趋势,剪应力最大值距离拉拔端较近,锚杆轴力却逐渐减小;拉拔荷载越大,剪应力、轴力均越大;锚固剂弹性模量越大,锚杆剪应力越集中,轴力变化程度越大;锚杆弹性模量越大,剪应力最大值越小,轴力越大,轴力分布相对集中。
In order to reveal the interfacial stress transfer law of full-length anchored GFRP bolt, the full-anchor model test of FRP bolt is carried out to obtain the distribution law of axial force and shear stress in the pull-out test of FRP bolt. Particle flow numerical simulation software(PFC) is used to study the stress distribution of anchor rod. Through the experiment, the influences of load on blot, the elastic modulus of anchorage agent and bolt on the stress distribution of anchor rod is revealed. The results have shown that the shear stress increases at first and then decreases from the pull-out end to the end of the anchor in the elastic bonding stage. The maximum shear stress is closer to the pull-out end and the axial force of bolt decreases gradually. The greater the pull-out load is, the greater the shear stress and axial force will be; the greater the elastic modulus of anchorage agent is, the more concentrated the shear stress is and the greater the change of axial force will be. The larger the elastic modulus of anchor is, the smaller the maximum shear stress is and the greater the axial force will be and the distribution of axial force is relatively concentrated.
In order to reveal the interfacial stress transfer law of full-length anchored GFRP bolt, the full-anchor model test of FRP bolt is carried out to obtain the distribution law of axial force and shear stress in the pull-out test of FRP bolt. Particle flow numerical simulation software(PFC) is used to study the stress distribution of anchor rod. Through the experiment, the influences of load on blot, the elastic modulus of anchorage agent and bolt on the stress distribution of anchor rod is revealed. The results have shown that the shear stress increases at first and then decreases from the pull-out end to the end of the anchor in the elastic bonding stage. The maximum shear stress is closer to the pull-out end and the axial force of bolt decreases gradually. The greater the pull-out load is, the greater the shear stress and axial force will be; the greater the elastic modulus of anchorage agent is, the more concentrated the shear stress is and the greater the change of axial force will be. The larger the elastic modulus of anchor is, the smaller the maximum shear stress is and the greater the axial force will be and the distribution of axial force is relatively concentrated.
引文
[1]马念杰,张玉,陈刚,等.新型玻璃钢锚杆研究[J].煤矿开采,2001(4):12-30.MA Nianjie,ZHANG Yu,CHEN Gang,et al.Research on the new FRP bolt[J].Coal Mining,2001(4):12-30.
[2]李英明.玻璃钢锚杆尾部失效机理及尾部新结构研究[D].北京:中国矿业大学(北京),2007.
[3]李英明,马念杰.金属套管压痕式锚尾承载力及其影响规律[J].中南大学学报(自然科学版),2014,45(2):581-588.LI Yingming,MA Nianjie.Bearing resistance and its influence law of metal tube-indentation bolt-end[J].Journal of Central South University(Science and Technology),2014,45(2):581-588.
[4]LUTZ L,GERGELEY M.Mechanics of band and slip of deformed bars in concrete[J].Journal of American Concrete Institute,1967,64(11):711-721.
[5]HANSOR N W.Influence of surface roughness of prestressing strand on band performance[J].Journal of Prestressed Concrete Institute,1969,14(1):32-35.
[6]张伟,金松丽,辛方超,等.岩土锚固技术的研究现状与展望[J].北方工业大学学报,2013,25(3):71-75,78.ZHANG Wei,JIN Songli,XIN Fangchao,et al.Status of research and prospect of rock soil anchoring technology[J].Journal of North China University of Technology,2013,25(3):71-75,78.
[7]YANG S T,WU Z M,HU X Z,et al.Theoretical analysis on pullout of anchor from anchor-mortar-concrete anchorage system[J].Engineering Fracture Mechanics,2008,75(5):961-985.
[8]卢黎,张永兴,吴曙光.压力型锚杆锚固段的应力分布规律研究[J].岩土力学,2008,29(6):1517-1520.LU Li,ZHANG Yongxing,WU Shuguang.Distribution of stresses on bonded length of compression type rock bolt[J].Rock and Soil Mechanics,2008,29(6):1517-1520.
[9]吴延峰,张敦福,张波,等.拉力型锚杆锚固界面剪应力分布偶应力理论分析[J].岩土力学,2013,34(增刊1):187-191.WU Yanfeng,ZHANG Dunfu,ZHANG Bo,et al.Analysis of shear stress near anchorage interface of tensile-type anchor with couple stress theory[J].Rock and Soil Mechanics,2013,34(Sup 1):187-191.
[10]文竞舟,张永兴,王成.隧道围岩全长黏结式锚杆界面力学模型研究[J].岩土力学,2013,34(6):1645-1651,1686.WEN Jingzhou,ZHANG Yongxing,WANG Cheng.Study of mechanical model of fully grouted rock bolt’s anchorage interface in tunnel surrounding rock[J].Rock and Soil Mechanics,2013,34(6):1645-1651,1686.
[11]赵同彬,尹延春,谭云亮,等.锚杆界面力学试验及剪应力传递规律细观模拟分析[J].采矿与安全工程学报,2011,28(2):220-224.ZHAO Tongbin,YIN Yanchun,TAN Yunliang,et al.Mechanical test of bolt interface and microscopic simulation of transfer law for shear stress[J].Journal of Mining&Safety Engineering,2011,28(2):220-224.
[12]贾新,袁勇,李焯芬.新型玻璃纤维增强塑料砂浆锚杆的黏结性能试验研究[J].岩石力学与工程学报,2006,25(10):2108-2114.JIA Xin,YUAN Yong,LEE C F.Experimental study on bond behavior of new type cement grouted GFRPbolts[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(10):2108-2114.
[13]黄生文,邱贤辉,罗文兴.GFRP锚杆锚固特性研究[J].长沙理工大学学报(自然科学版),2009,6(3):33-39.HUANG Shengwen,QIU Xianhui,LUO Wenxing.The bond feature researching of the GFRP(glass fiber reinforced polymer)bolt[J].Journal of Changsha University of Science&Technology(Natural Science),2009,6(3):33-39.
[14]黄志怀,李国维,王思敬,等.不同围岩条件玻璃纤维增强塑料锚杆结构破坏机制现场试验研究[J].岩石力学与工程学报,2008,27(5):1008-1018.HUANG Zhihuai,LI Guowei,WANG Sijing,et al.Field test on pullout behaviors of anchorage structures with glass fiber reinforced plastic rods for different surrounding rock masses[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(5):1008-1018.
[15]李国维,高磊,黄志怀,等.全长黏结玻璃纤维增强聚合物锚杆破坏机制拉拔模型试验[[J].岩石力学与工程学报,2007,26(8):1653-1663.LI Guowei,GAO Lei,HUANG Zhihuai,et al.Pull-out model experiment on failure mechanism of full-length bonding glass fiber reinforced polymer rebar[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1653-1663.
[16]刘颖浩,袁勇.全螺纹GFRP黏结型锚杆锚固性能试验研究[[J].岩石力学与工程学报,2010,29(2):394-400.LIU Yinghao,YUAN Yong.Experimental research on anchorage performance of full-thread GFRP bonding anchor bolts[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):394-400.
[17]姚海.锚杆-锚固剂-岩体界面力学特性实验研究及其有限元分析[D].太原:太原科技大学,2008.
[18]高丹盈,张钢琴.纤维增强塑料锚杆锚固性能的数值分析[J].岩石力学与工程学报,2005,24(20):3724-3729.GAO Danying,ZHANG Gangqin.Numerical analysis of anchorage behavior of fiber reinforced plastic bolts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(20):3724-3729.
[2]李英明.玻璃钢锚杆尾部失效机理及尾部新结构研究[D].北京:中国矿业大学(北京),2007.
[3]李英明,马念杰.金属套管压痕式锚尾承载力及其影响规律[J].中南大学学报(自然科学版),2014,45(2):581-588.LI Yingming,MA Nianjie.Bearing resistance and its influence law of metal tube-indentation bolt-end[J].Journal of Central South University(Science and Technology),2014,45(2):581-588.
[4]LUTZ L,GERGELEY M.Mechanics of band and slip of deformed bars in concrete[J].Journal of American Concrete Institute,1967,64(11):711-721.
[5]HANSOR N W.Influence of surface roughness of prestressing strand on band performance[J].Journal of Prestressed Concrete Institute,1969,14(1):32-35.
[6]张伟,金松丽,辛方超,等.岩土锚固技术的研究现状与展望[J].北方工业大学学报,2013,25(3):71-75,78.ZHANG Wei,JIN Songli,XIN Fangchao,et al.Status of research and prospect of rock soil anchoring technology[J].Journal of North China University of Technology,2013,25(3):71-75,78.
[7]YANG S T,WU Z M,HU X Z,et al.Theoretical analysis on pullout of anchor from anchor-mortar-concrete anchorage system[J].Engineering Fracture Mechanics,2008,75(5):961-985.
[8]卢黎,张永兴,吴曙光.压力型锚杆锚固段的应力分布规律研究[J].岩土力学,2008,29(6):1517-1520.LU Li,ZHANG Yongxing,WU Shuguang.Distribution of stresses on bonded length of compression type rock bolt[J].Rock and Soil Mechanics,2008,29(6):1517-1520.
[9]吴延峰,张敦福,张波,等.拉力型锚杆锚固界面剪应力分布偶应力理论分析[J].岩土力学,2013,34(增刊1):187-191.WU Yanfeng,ZHANG Dunfu,ZHANG Bo,et al.Analysis of shear stress near anchorage interface of tensile-type anchor with couple stress theory[J].Rock and Soil Mechanics,2013,34(Sup 1):187-191.
[10]文竞舟,张永兴,王成.隧道围岩全长黏结式锚杆界面力学模型研究[J].岩土力学,2013,34(6):1645-1651,1686.WEN Jingzhou,ZHANG Yongxing,WANG Cheng.Study of mechanical model of fully grouted rock bolt’s anchorage interface in tunnel surrounding rock[J].Rock and Soil Mechanics,2013,34(6):1645-1651,1686.
[11]赵同彬,尹延春,谭云亮,等.锚杆界面力学试验及剪应力传递规律细观模拟分析[J].采矿与安全工程学报,2011,28(2):220-224.ZHAO Tongbin,YIN Yanchun,TAN Yunliang,et al.Mechanical test of bolt interface and microscopic simulation of transfer law for shear stress[J].Journal of Mining&Safety Engineering,2011,28(2):220-224.
[12]贾新,袁勇,李焯芬.新型玻璃纤维增强塑料砂浆锚杆的黏结性能试验研究[J].岩石力学与工程学报,2006,25(10):2108-2114.JIA Xin,YUAN Yong,LEE C F.Experimental study on bond behavior of new type cement grouted GFRPbolts[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(10):2108-2114.
[13]黄生文,邱贤辉,罗文兴.GFRP锚杆锚固特性研究[J].长沙理工大学学报(自然科学版),2009,6(3):33-39.HUANG Shengwen,QIU Xianhui,LUO Wenxing.The bond feature researching of the GFRP(glass fiber reinforced polymer)bolt[J].Journal of Changsha University of Science&Technology(Natural Science),2009,6(3):33-39.
[14]黄志怀,李国维,王思敬,等.不同围岩条件玻璃纤维增强塑料锚杆结构破坏机制现场试验研究[J].岩石力学与工程学报,2008,27(5):1008-1018.HUANG Zhihuai,LI Guowei,WANG Sijing,et al.Field test on pullout behaviors of anchorage structures with glass fiber reinforced plastic rods for different surrounding rock masses[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(5):1008-1018.
[15]李国维,高磊,黄志怀,等.全长黏结玻璃纤维增强聚合物锚杆破坏机制拉拔模型试验[[J].岩石力学与工程学报,2007,26(8):1653-1663.LI Guowei,GAO Lei,HUANG Zhihuai,et al.Pull-out model experiment on failure mechanism of full-length bonding glass fiber reinforced polymer rebar[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1653-1663.
[16]刘颖浩,袁勇.全螺纹GFRP黏结型锚杆锚固性能试验研究[[J].岩石力学与工程学报,2010,29(2):394-400.LIU Yinghao,YUAN Yong.Experimental research on anchorage performance of full-thread GFRP bonding anchor bolts[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):394-400.
[17]姚海.锚杆-锚固剂-岩体界面力学特性实验研究及其有限元分析[D].太原:太原科技大学,2008.
[18]高丹盈,张钢琴.纤维增强塑料锚杆锚固性能的数值分析[J].岩石力学与工程学报,2005,24(20):3724-3729.GAO Danying,ZHANG Gangqin.Numerical analysis of anchorage behavior of fiber reinforced plastic bolts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(20):3724-3729.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |