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《Chinese Journal of Geotechnical Engineering》 2012-10
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Pullout mechanism of GFRP soil nails

ZHU Hong-hu 1,2,ZHANG Cheng-cheng 1,PEI Hua-fu 3,ZHOU You 1,SHI Bin 1(1.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China;2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;3.Department of Civil and Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China)  
Recently,great attention has been drawn to the new soil nail materials represented by glass fiber reinforced polymer(GFRP) as the traditional materials show certain disadvantages,including low corrosion resistance and poor durability.According to the loading characteristics of GFRP soil nails,a model using a hyperbolic shear stress-shear strain relationship is proposed to describe the pullout performance of GFRP soil nails during pullout.Numerical analysis is made to solve the pullout governing equation,based on which the distribution of axial force,shear stress and displacement along the nail length is calculated.Besides,laboratory pullout tests on a model soil nail are conducted,and the accuracy of the predicted results by the proposed model is verified by the test results.Furthermore,a parametric study of the pullout model is conducted to analyze the influence of nail diameter,shear resistance of soil-nail interface,and modulus ratio between soil and nail.Finally,the allowable pullout resistance of GFRP soil nails is suggested to be determined using the displacement control approach.
【Fund】: 国家重点基础研究发展计划(973计划)项目(2011CB710605);; 国家“十二五”科技支撑计划课题(2012BAK10B05);; 地质灾害防治与地质环境保护国家重点实验室开放基金资助项目(SKLGP2012K011);; 教育部大学生创新训练计划资助项目(XZ1110284066)
【CateGory Index】: TU472
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