The tunnel-type anchorage is the key force component to bear the main cable load of suspension bridge

and the mechanism of tunnel anchorage and surrounding rock joint bearing is very complicated. The simplified calculation model of tunnel anchor is established; and a formula for calculating the pullout capacity of tunnel anchor is deduced by using the wedge effect method. Furthermore

in order to verify the rationality and correctness of the "wedge effect" calculation method

the 14 groups corresponding indoor model tests are designed and carried out. Through the model tests

the uplift bearing capacity is obtained; and the relationship between the influence factors and the uplift capacity is studied. With the accurate related parameters of indoor model

using the calculation method of bearing capacity of indoor tunnel anchor model

and contrasted it with the results of model test

the results show that the theoretical calculation results are consistent with the law of influence factor and destruction characteristic. Research results show that it is scientific and reasonable to calculate the bearing capacity of tunnel anchorage by the simplified formula considering the “wedge effect”. This calculation method has the characteristics of clear mechanical meaning and concise formula form

so as to provide reference for engineering practice.