Bearing Behavior Research of Rock Anchorage System for Suspension Bridge
The rock anchorage system of suspension bridge can make full use of the bearing capacity of rock mass.In order to study the load-bearing characteristics and failure mode,we first established a geological conceptual model,and obtained the mechanical properties of rock mass,based on the rock anchorage system of a highway double-tower single-span steel box girder suspension bridge with a main span of 1 768 m.Then,FLAC3D was used to establish a three-dimensional model of the interaction between the anchorage system and the surrounding rock,and the distribution of the plastic zone,deformation characteristics,and failure mode of the rock anchorage in the rock anchor area were simulated and analyzed.Finally,the uplift stability coefficient is obtained by using the wedge fracture method.The The results show that:1)The failure mode of the rock anchorage system is that the rock anchorage and surrounding rocks undergo overall tensile-shear composite failure along the fracture angle under the tension of the main cable;2)Through the overload method,the stability safety coefficient of the surrounding rock of the rock anchorage system is 7.0;3)Using the wedge fracture method,the uplift stability coefficient of the rock anchorage is 4.0.
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