Earth Pressures And Deformation Analysis Of Deep Excavation

With the development of economy, technology and urban construction, more and more excavation projects demand highly qualified design too. Thus the research on lateral earth pressure developed by the backfill , analysis and control of deformation are becoming more and more important.Based on vertical differential element method and the variational principle, the slip surface of the rigid retaining wall under active and passive conditions is studied; the analytic solution to the slip surface curve is derived and by which the contribution of the fill's properties , the smoothness of the retaining wall's back are discussed.By the limit equilibrium theory and horizontal differential slice method, the lateral earth pressure against the back of the rigid retaining wall under active and passive conditions is analyzed, and the analytic solution for the distribution of earth pressure along the height of the retaining wall is obtained, by which the effect of friction angle between retaining wall's back and fill on the magnitude , the point of application of the resultant earth pressure and earth pressure coefficient are studied. Moreover, the applicability of the analytical answers to earth pressure is verified by model and in situ experiments.The applicability of the earth pressure equation of the retaining wall under active or passive conditions in excavation design was completely discussed with the Tschebotarioff, Terzaghi-Peck earth pressure envelop diagram and Rankine's theory. And the range of the correction factor of lateral earth pressure according to different kind of soil was offered. Active and passive pressure with time and deformation is studied by in-situ test at a excavation of a sewage disposal plant in Zhangzhou.The deformation mode of the soldier piles in excavation was generalized and the analytical solution to the horizontal deformation of the pile's head with both cantilever solider piles and anchored (strutted) solider piles through the principle of minimum potential energy. And the impact on the excavation deformation was studied by the length of excavation, surcharge loading, pile distance, rigidity and position of anchor or strut and deformation curve. Including these, the deformation analytical method is...