基于双界面滑移耦合的水泥土锚杆荷载传递模型

水泥土锚杆的承载过程伴随筋体—黏结体界面和黏结体—岩土体界面的黏结强度调动，界面剪应力的径向传播机制受到不同界面附近材料的应力和变形条件影响，对水泥土锚杆进行荷载传递分析需考虑双界面的剪切变形耦合。结合锚杆受力变形分析常用的荷载传递法和剪切位移法，将二者分别用于界面剪应力在锚杆轴向和径向引起的变形分析计算，考虑锚杆双界面的剪应力与剪切变形耦合，建立基于界面特性测试的水泥土锚杆双界面滑移耦合荷载传递分析模型。通过水泥土的材料性质试验及单元体尺度和模型试验尺度的水泥土锚杆拉拔试验，获得了模型的计算参数取值，并验证了模型对锚杆拉拔响应的预测能力。

Load-transfer model of soil mixing anchors based on coupled dual-interface slips

The load-transfer modelling of soil mixing anchor is regarded as taking the coupling of dual-interface slip into account. It is essentially caused by the mobilization of bond strength for both the reinforcement-binder and the binder-matrix interfaces, and the impact of stress and strain conditions of materials adjacent to the interfaces on the propagation of interface shear stress. A recently developed load-transfer modelling framework of soil mixing anchor accounting for coupling of dual-interface slips was presented in this work based on interface characterization. This framework was established by integrating load-transfer method and shear displacement method, conventionally used in anchor behavior analysis, to solve for the straining of soil mixing anchor induced by interface shear stress in axial and radial directions, respectively. Laboratory testing including mechanical characterization of cemented soils, pullout tests on soil mixing anchor using elementary specimen and model specimen were carried out to calibrate the parameters in modeling and to validate the predictive capability for the pullout response of the presented modelling framework.