| In the modern traffic system, the suspension bridge scheme which has the long span length is thought more and more important. The anchorage of the long-span suspension bridge project wholly concerns the most significant design and building task, namely the anchorage's mechanism of action, the valuation and countermeasure of the confidence level for the anchorage. This also is the key and emphasis for the design and construction of the suspension bridge.The tunnel anchorage system is an anchorage style which has a great future for the engineering application. The research for the mechanism of action of the tunnel anchorage system has became the foundation which can guide the design and construction of the tunnel anchorage. This paper refers the scientific project belonging to the Traffic Department of the Tibet province. Through FEM numerical simulation, researches the mechanism of stress of the tunnel anchorage, the effect to the stability of the wall rock which surround the anchorage and the optimization for the design of the anchorage. This paper adopts the large finite-element-analysis common software ANSYS to research these problems, and simulates the interactivity between the anchorage and the wall rock by the special 3D face-face contact element in ANSYS. On the basis of these calculating solutions, this paper has verified that the displacement of the anchorage along the main cable direction and the disturbance to the surrounding rock accord with the design requirement, the anchorage system is stable; reviewed the effect to the displacement of the anchorage along the main cable direction and the stability of the surrounding rock ,following the variation of the design parameter(the blinding power c, the tilt angle of the anchorage α, the axial length of the anchorage L, the magnified angle of theanchorage y ,etc.)And on the basis of the withdrawal resistance formula of the rock formation pile, this paper has approximated and deduced the calculation formula for...
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