摘要
由于传统土钉材料存在易腐蚀、耐久性差等缺点,近年来以GFRP为代表的新型土钉材料得到了高度重视。针对GFRP土钉受力特性,运用双曲线模型描述其在拉拔过程中剪应力–剪应变关系,采用数值方法求解拉拔控制方程,从而确定轴力、剪应力及位移沿钉长的分布。同时,通过室内GFRP模型土钉的拉拔试验,验证了该模型预测结果的准确性。在此基础上,对土钉直径、土–钉界面抗剪强度、土–钉模量比等参数进行了参数分析,并针对GFRP土钉容许拉拔力的确定提出了按位移控制的思路。
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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第10期1843-1849,共7页
Chinese Journal of Geotechnical Engineering
基金
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)
