基于Mindlin解的预应力锚索荷载-变位关系

Load-Deformation Relation of Prestressed Anchor Cable Based on Mindlin Solution

通过分析有自由段充填注浆的预应力锚索的动态工况特征和边界条件,基于锚注体-围岩界面径向与轴向变形协调条件,建立了等效介质模型.采用柱状空间内的Mindlin积分解和轴对称径向膨胀力Mindlin解,导出了内锚固段轴力分布和预应力作用下的荷载-变位关系方程.结合原位试验结果,分析、比较了荷载-变位特征曲线及轴力分布形态.

Based on the compatibility conditions of axial and radial deformations of anchor-rock interface, an equivalent medium model was established by analyzing the dynamic load character and boundary conditions of a prestressed anchor cable with a free part without injecting cement paste. The axial force distribution and the mathematical expression to describe the relation between the deformation and pretension of a prestressed anchor cable were derived by using the Mindlin integral solution in column space and the Mindlin solution for axisymmetric radial dilation load. In addition, the characteristic curve of load-deformation and the distribution modality of axial stress were compared with field testing results.