Soft Soil Deep Foundation Deformation Prediction

In development of deep foundation engineering, it is necessary introduce Information Construction Method into the deep foundation engineering ,for reducing the pit trouble.The Information Construction Method is a kind of moderon construcion management way to make use of system engineering,includes the informationg acquisition back coupling,back analysis, control and decision.The research is for example Runyang Changjiang River Highway Bridege ,expounds the method how to apply the Information Construction Method into the practice engineering,at the same time,discussing some the factor of influcing the deep foundation stability how to influce the deep foundation's stability.Form the research ,we have some following results:1 .In construction process of super and deep pit, super pore water pressure creation has related to outside load, soil layer conditions, and underground water level.2. Discussing the soil press calculation method under the action of actual loading: in soft soil areas,the soil press calculation of water with soils is close to the reality. Must apply it on the theory, but for the present conditions, it has much limitation. And the contribute of water pressure to soil pressure is oversized. 3.Studying the wall level displacement(supposed as S ) and corresponding excavation depth(supposed as a )in different work condition,the relationship is S = 0.0 1aht.4. Dicussing soil pressure(supposed as P)and level displacement(supposed as S) in condition thatconsideration time performance,the relation is P = ae ,when the defomation of wall hasevidently effect on the soil pressure.5.The deformation of wall(supposed as Sw) leads to soil layer sedimentation(supposed as Pw),theresearch find Pw= 1.22Sw6.The Artifical Neural Networks has vast and applied foreground in the information construcionof deep foundation excluding the accidental factor.7. According to the factual character, creating the tridimensional fmit element model under thefactual work condition and the space effect, analysis the deforming phenomenon of pit. Andanalysis the factors' sensibility that influence pit's stability.