| The tunnel-type anchorage is an important part of suspension bridge. The performance of the tunnel-type anchorage under loading is directly related to the stability and security of the whole bridge structure. In our country, few tunnel-type anchorageswere used in long-span suspension bridge. Tunnel-type anchorage was commonly used in the bridge site with less joint, good rock properties and being shallow buried. The problems of stability safety and buckling failure under the long continuousvehicle loading exist in the tunnel-type anchorage of soft rock area.Ji jiang river bridge was the rare example which used the tunnel-type anchorage in soft rock area in our country. Using the steel reinforced composite tunnel-type anchorage, the power transmission path was enlarge in the rock area. Steel vertical embedded in anchor body and the surrounding rock mass was involved in the overall structure function.Taking the Ji jiang bridge as the engineering background, numerical simulation analysis on the construction and operation stage was launched, the different strengthen measures were comparatively analysed, and the loading and rheological test were carried out. The main contents and clnclusions of this thesis are as follows:1. Based on the FLAC3D model under overloading, the performance of the excavation of tunnel anchorage,design loading and overloading were analogized, the results of the anchorage and rock deformation,stress,potential failure mode,the ultimate bearing capacity and the maximum displacement of anchoragewere analyzed.2. Tunnel anchor structure optimization and strengthening measures were proposed.Based on the FLAC3D model under overloading, the different strengthen measures were contrastively analyzed, and the conclusion was drawn that the using of the steel reinforced composite tunnel-type anchorage could significantly improve the stability safety coefficient of surrounding rock around the anchor.3. By analying the results of 1:10 scale model test in nature, it was concluded that the instant deformation of anchor bodyand surrounding rock under different load, creep deformation, strength characteristics and damage characteristics.4. By contrasting and analying the results of 1:30 scale model tests in moist and nature,it wss concluded that the instant deformation of anchor bodyand surrounding rock, creep deformation, strength, damage characteristics and weaken degree of water. |
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