The Tunnel Excavation Impact Studies, Building Structures On The Ground

Taking the frame structure on the ground above tunnel as the researching object, the paper focuses mainly on the influence of tunnel construction on the surrounding environment by means of theoretical analysis, model test and numerical simulation . Following researching work has been done :(1)In theoretical aspect, the mechanism of stratum of perturbation is analysized . Combined with examples the frame structure's additional stress caused by uneven subsurface settlement is caculated .(2)The theory of the co-action of Ground - Foundation - superstructure is utilized to analysize the influence of tunneling on superstructure , and the theory of co-action of Tunnel - Ground -superstructure is proposed .(3)In experimental study , the similarity rule of the structure and layered soils is deduced from similarity theory . By the model test of the influence of tunneling on superstructure , the following results are obtained :a) The graph of subsurface settlement troughsb) The graph of subsurface settlement - timec) The extra strain of superstructure caused by tunnel excavation .(4)In numerical simulation, two - dimensional mechanics model is set up . ANSYS software is applied to anlysize the influence of tunneling on ground structure , to draw the graph of subsurface settlement , and to analysize the additional stress of superstructure .(5)The damage form of superstructure due(?)ing is analysized , and protective measures are proposed to control the damage effect in the rational range . Comparing with the result of the theoretical analysis , model test and numerical simulation ,the prediction about the size of subsurface settlement and the additive structure stress and strain is basically identical. Locating in unfavorable position of the structure the additive stress may exceed its extreme ,and it indicates the influence on ground building due to tunneling can not be neglected.