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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。
Due to the defects of easy corrosion and poor durability of traditional soil nail materials, the new type of soil nail materials represented by GFRP has drawn great attention in recent years. According to the mechanical properties of GFRP soil nails, the hyperbolic model is used to describe the relationship between shear stress and shear strain in drawing process. The numerical control method is used to solve the drawing control equations to determine the distribution of axial force, shear stress and displacement along the nails. At the same time, the accuracy of the prediction results of the model is verified by the pullout test of indoor GFRP soil nail. On this basis, the parameters of soil nail diameter, soil-nail interface shear strength, soil-nail modulus ratio and other parameters were analyzed. The idea of displacement control was put forward to determine the allowable pullout force of GFRP soil nail.