关键词: 锚杆, 非线性界面模型, 锚杆拉拔极限荷载, 小波函数

Abstract: Based on scaling and translation properties of wavelet function, a nonlinear constitutive model of shear stress-displacement of bolt interface is established to simulate the anchoring interface stick-soft-slip mechanical characteristics. The proposed model overcomes the disadvantage in complexity of stage analysis by tri-linear bond-slip model. The equations of load-displacement curves of the bolt is deduced based on the mechanical differential equations of load transfer of the bolt, and corresponding numerical calculation methods and steps are proposed. The displacement, axial force and shear stress distribution along the anchorage length under different pullout displacements are obtained, and the complete load-displacement curve is obtained through a practical example. The calculated load-displacement curves as well as the distributions of the interfacial shear stress and the bolt axial stress are in good agreement with test results. The method can accurately reflect the force transmission mechanism of the bolt under different loads, and simulate the whole process from elastic working state to the plastic slip of the bolt. The influence of the anchorage length, axial stiffness and the constitutive parameters of the anchorage on the anchorage effect are obtained through the analysis of parameters.

Key words: bolt, nonlinear interfacial model, ultimate pullout loading of anchor, wavelet function