Research On Relation With Active Earth Pressure And Displacement Of Foundation Pit

In recent years, the high-speed development of the urban architecture and the sufficient use of underground space not only promote the development of deep foundation pit, also bring a large number of project issue to the excavating and braced structure of the foundation pit during constructing. The traditional design method of braced structure have a lot of shortcoming , for example , it is unable to consider the impact on soil pressure of deformation of braced structure; unable to get the deformation of braced structure and soil body behind the wall.This dissertation particularly introduces the style and character of braced structure in excavation, and introduces method of calculation in design presently. On analyzing the importance of earth pressure in design of foundation pit, the dissertation indicates the localization of traditional theory of earth pressure. On studying measure active earth pressure and displacement of braced structure in excavation, the dissertation analyzing there are some relation in active earth pressure and displacement. On this basis, regarding the Rankine soil pressure theory as the prerequisite, the active earth pressure formula considering the deformation of braced structure has been set up. The calculation of active limit displacement in the formula has been researched, and proposes two methods; all of which are applied to active soil pressure formula considering the deformation of braced structure. Further, combine the project example, the active earth pressure formula considering the deformation of braced structure has been tested and confirmed its rationality. Simultaneously, the two methods of calculating the active limit displacement are also confirmed rational. Finally the reduced coefficient of active earth pressure has been analyzed in this paper, which further confirmed the formula rationality.