中文摘要：

通过FLAC^3D程序，用实体单元模拟了岩体和砂浆体，用结构单元来模拟锚索，在砂浆体和岩体间设置接触面，对锚索施加预应力时采用新的建模方法，即通过结构单元来模拟压力分散型锚索的承压板，代替在承压板的位置施加均布力的方法，建立预应力锚固数值仿真模型。通过模拟试验，分析了接触面单元、岩体单元以及砂浆体单元的应力云图等，更加清晰地显示了压力分散型预应力锚索作用下岩体沿锚索轴向的应力、砂浆体与孔壁之间的粘结应力分布等情况。

英文摘要：

In this paper ,the rock and mortar is simulated by solid mass element, the cable is simulated by structural element, the interface is setted between the rock and mortar, and the prestress is applied to the cable according to the new method in FLAC^3D program, that is to say, the board in pressure diffusion anchor cable is simulated by structural element rather than the distributed loads gained by the theoretical analysis are applied to the board. And then the numerical simulation model of prestress anchorage is established, After that, the stress nephogram of the interface, rock and mortar mass is analysed; and then the axial stress along cable in rock mass, bond stress distribution between mortar mass cell and membrane, which is affected by pressure diffusion anchor cable are displayed more clearly.