It is a key to reveal the failure mechanism and constitutive relation of the anchor segment of the anchor cable. By using the self-developed pull-twist coupling device, the pull-out tests for anchor cables with non-rotation and free rotation conditions were carried out, respectively, and the pull-out load–torque–displacement curves were obtained to study the failure mechanism and constitutive relation of the anchor cables. Results show that the pull-out load of the anchor cable with non-rotation is larger than that in the free rotation state, and the torque reverse force generated of the anchor cable accounts for 24.6–32.0% of the pull-out load during the pull-out tests. With the increase in pull-out load, the torque increases firstly and then decreases when it reaches the peak value. The relationships between the pull-out load and torque show the cubic polynomial and are basically linear at different stages. The failure mechanism of the anchorage segment displays the pulling failure at first and then the pulling and shearing failures. The pull-out load–torque–displacement relationship of the anchor cable goes through three stages: the loading, the softening, and the residual stages. The fitted constitutive relationship curves are in good agreement with the experimental curves. The obtained conclusions can provide a theoretical reference for the similar practice.

中文翻译：

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拉拔荷载作用下锚索锚固段破坏机理及本构关系

揭示锚索锚段的破坏机理和本构关系是关键。利用自主研发的拉扭耦合装置，分别对锚索进行了非旋转和自由旋转工况的拉拔试验，得到拉拔载荷-扭矩-位移曲线，研究锚索破坏机理及本构关系。结果表明，非旋转状态下锚索的拉拔载荷大于自由旋转状态，锚索产生的扭矩反向力占拉拔载荷的24.6%~32.0%。拔出测试。随着拔出负载的增加，转矩先增大，达到峰值后减小。拔出载荷与转矩的关系呈三次多项式，在不同阶段基本呈线性关系。锚固段的破坏机理表现为先是拉力破坏，然后是拉剪破坏。锚索的拔出载荷-扭矩-位移关系经历三个阶段：加载阶段、软化阶段和残余阶段。拟合的本构关系曲线与实验曲线吻合良好。所得结论可为类似实践提供理论参考。锚索的拔出载荷-扭矩-位移关系经历三个阶段：加载阶段、软化阶段和残余阶段。拟合的本构关系曲线与实验曲线吻合良好。所得结论可为类似实践提供理论参考。锚索的拔出载荷-扭矩-位移关系经历三个阶段：加载阶段、软化阶段和残余阶段。拟合的本构关系曲线与实验曲线吻合良好。所得结论可为类似实践提供理论参考。