考虑土体变形与界面剪切耦合作用锚杆拉拔响应

针对土层锚杆在拉拔荷载作用下的轴向变形问题,考虑锚杆周边土体变形与锚-土界面剪切的耦合作用,建立了表征锚杆锚固体荷载传递机理的有限差分物理模型。通过数值编程求解该模型,获得了不同拉拔荷载水平下的锚杆轴向变形和土体剪切变形的解答,从而明确了锚固体在拉拔过程中荷载变形曲线和沿杆体长度方向的轴力分布规律。方法与荷载传递方法和剪切位移法等对某实际工程中灌浆锚杆案例进行分析,将各方法所获解答与实测数据进行了对比分析。结果表明:考虑土体变形与界面剪切耦合的模型可以获得与实测数据更为吻合的荷载位移曲线和轴力分布,验证了该模型的优越性和准确性。

Pullout Response of Soil Anchor under Coupled Effect of Soil Deformation and Interface Shear

Axial deformation of soil anchor subjected to pullout force was investigated by establishing a finite difference physical model, which accounted for coupled interaction of soil deformation and anchor-soil interface shear in characterization of load transfer mechanisms of soil anchor. Numerical programing was used to implementation of solutions for axial deformation, axial stress distribution along the entire length of anchor, under varying pullout load. Comparisons of this proposed method, conventional load transfer method and shear displacement method was performed in computational analyses for a practical case with available measurements. Better agreement with measured load-displacement curve was observed for results of the proposed method, which demonstrated the superiority and accuracy of this model considering above coupled effect.