基于荷载传递法和剪切位移法压力型锚杆刚度分析

Analysis of Pressure Type Anchor Bolt Stiffness Based on Load Transfer Method and Shear Displacement Method

引用剪切带概念对锚杆锚固受力及荷载传递特性进行了分析阐述,基于理想的弹塑性剪切滑移模型模拟锚固界面受荷作用,运用荷载传递法与剪切位移法对锚杆锚固界面及界面外土体的剪切变形进行分析求解,据此推导了压力型锚杆刚度系数的计算公式。对刚度系数计算公式的影响因素进行了分析,结果表明压力型锚杆的刚度系数会随锚固长度增加而增长,但当锚固长度过大时会产生部分无效锚固段,锚杆锚固段直径和灌浆体弹性模量均与刚度系数有正相关关系,同时土体的力学性质与锚杆刚度系数也有紧密联系。

The shear band concept is used to analyze the anchorage force and load transfer characteristics of anchor bolt. Based on the ideal elastoplastic shear slip model, the anchorage interface loading is simulated, and the load transfer method and shear displacement method are used to analyze the anchorage interface and the shear deformation of the soil outside the interface, and the calculation formula of the stiffness coefficient of the pressure anchor is derived. The influence factors of the stiffness coefficient formula are analyzed. The results show that the stiffness coefficient of the pressure type bolt increases with the increase of the anchorage length. But when the anchorage length is too large, some invalid anchorage segments will be produced. The diameter of the anchorage section and the elastic modulus of the grouting body are all positively related to the stiffness coefficient, and the mechanical properties of the soil are also closely related to the stiffness coefficient of the bolt.