Investigation Of Influence Of Ground Surface Settlement Induced By Tunnel Excavation On Adjacent Buildings

With the development of subway tunnel, environment damage due to the construction of tunnel attracts more and more attention. During and after the construction the tunnel should be responsible for the damage which can occur at the appearance of buildings or cause functional expense for the buildings. The cost of economy for strengthening buildings is relatively significant. In general, the protecting of buildings is not included in the design when starting a subway project, and it depends mainly on the control of ground surface settlement under construction. Now it can often be done to set a limited settlement for protecting buildings, for example, like 3cm for Beijing. If the limit was exceeded the adjusting of the order of excavation or the correction of initial plan could be done. This processing, however, ignores specific type of buildings and corresponding response to the tunnel excavation for the buildings, then those strengthening measures are not very essential, sometimes it seem to be very conservative. In order to explore the effect of the buildings to deformation of the formation and deformation of the formation to buildings, carrying on the changes of internal force of buildings induced by excavation of tunnel dynamic process tracking, studying the changes of internal force of buildings causing by two parameters: offset S and burying depth H, the main conclusions are as follows:(1) The existence of building and the foundation will have an impact on the surface deformation, it can confine horizontal displacement and effect the settlement trough curve;(2) The tunnel excavation caused by the difference between the settlement would affect the structure of the internal forces, and the tunnel side and back side of the tunnel is different;(3) Changes of the offset S between the centre of runnel and centre of structure and the burying depth H has very important impact on the changes of internal forces of structure, but the impact is different, and the response of moment and shear is different too.