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| Bearing characteristics of a novel rock anchorage system for suspension bridges: Field scaled model test study |
| WANG Zhen1, WANG Zhonghao1, GUO Xifeng1*, YANG Xingyu1, FAN Hongwei1, XU Dongdong2 |
(1. Chongqing Branch, Yangtze River Scientific Research Institute, Chongqing 400026, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei 430010, China)
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Abstract The Xihoumen Rail-road Bridge is the first in China to implement a novel rock anchorage system. A 1:10 in-situ scaled model test was designed and conducted to systematically investigate the deformation characteristics, mechanical response, and failure mechanism of the structure. The results indicate that, under anchor cable tension, the deformation of the surrounding rock near the rear anchor plate is significantly greater than that near the front anchor plate, with the maximum ground surface deformation occurring at the centerline between the two anchor plates at the front anchorage face. Vertically, the deformation decreases approximately linearly from the bottom edge of the rock anchorage zone toward the ground surface. Strain analysis reveals that the surrounding rock is predominantly under compression, with the most pronounced compression occurring near the rear anchor plate; additionally, vertical compression and local tensile effects at the bottom edge of the rock anchorage zone are also evident. Based on the load-displacement relationship, strength analysis shows that the proportional limit strength, yield strength, peak strength, and residual strength of the model anchorage structure are approximately 4P, 7P, 11P, and 10P, respectively, where P represents the design load. The failure process unfolds sequentially through rear-edge tensile cracking, lateral shearing, and basal shearing. These findings elucidate the load-bearing mechanism and failure evolution of the novel rock anchorage system, providing valuable insights for the design and construction of similar anchorage systems in large-span suspension bridges.
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2026, Vol. 45 
