预应力锚索锚固作用机理的数值模拟研究

在探讨预应力锚索现场足尺试验实施难点的基础上，利用FLAC3D对预应力锚固体的应力、位移特点，不同的锚索刚度、岩土体弹性模量以及预应力大小对锚固体剪应力的分布规律的影响、塑性破坏区的转移趋势进行了数值模拟，拟合了剪应力呈指数函数关系的分布公式。在剪应力峰值不断向锚固端扩展的推断下，提出了注浆体接触面处的锚索极限锚固力的计算公式，具有一定的理论和实践意义。

Research on numerical simulation of anchoring mechanism of prestressed anchor cables

Based on probe to the difficulty in the full-scale test-in-situ of the anchor cable, then the stress and displacement of the prestressed anchor body, the distribution principle of the shear stress on anchor body face, which is influenced by the different anchor cable rigidities, the elastic modulus of rock-soil body and the scale of prestressing; and the diversion trend of the plastic damage zone are numerically simulated by use of FLAC3D. The distribution formula of shear stress which has the r index function relationship is fitted. Under the deduction that the peak value of the shear stress continuously expands to the tail of the anchor body, the paper puts forward the formula for ultimate anchor force on the interface of the grouting body and rock-soil; it has academic and practical significance.