(1. Key Laboratory for Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China；2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；3. Three Gorges Geotechnical Consultants Co.，Ltd.，Wuhan，Hubei 430073，China)
Abstract：In order to reveal mechanism and the global stability of Wujiagang yangtze river bridge tunnel-type anchorages，the deformation characteristics and the potential failure mode of surrounding rockmass，a 3D geomechanical model test with the similar scale of 1∶40 for tunnel-type anchorage was carried out. Base on the similarity theory，the complex geological structures including anchor plug body and different rock mass are simulated. Through the overloading destructive model test，the deformation characters，the failure process，the pattern and mechanism of tunnel-type anchorages and surrounding rockmass are obtained. The test results show that the deformation characteristic curves at the rear surfaces of anchorages and surrounding rockmass present symmetrical bimodal shape，and those of the frontal surfaces present the shape of convex upward. The deformations at the rear surface are greater than those at the frontal surface. Because of the clamping effect，the amount of deformation in the surrounding rock range 1.0 to 1.5 times width of anchorages rear surface is large. After comprehensive analysis，the global stability coefficient of tunnel-type anchorages is considered to be 9.0.
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2016, Vol. 35 
