Abstract:Based on the theory of particle flow code(PFC),the numerical analysis model is established to study the anchorage mechanism of sand consolidated anchorage prestressed bolt. According to the numerical model tests,the relationship between pulling force and displacement of loading plate is studied,and the microscopic characteristics of sand particle under the load such as the stress filed,displacement filed and the variation rule of porosity are analyzed. Conclusions can be drawn as follows:the displacement of loading plate increases quickly in the earlier stages of loading,but the increment gradually reduces with the increasing of loading. Along with the moving of loading plate,the interior porosity and the mutual contact force among sand particles will experience reducing and increasing courses with the distance extended from the loading plate,but finally they all can be reached to stabilization. By comparing the results with those of the indoor model tests,the conclusions of numerical simulation are proven to be reasonable. Finally,some factors that may influence the anchorage performance such as embedment deepness of loading plate,original porosity and the breadth of loading plate,are analyzed.