Research On Static And Dynamic Property Of Composite Foundation Considering Anisotropy

Composite foundation as an economic and effective treatment method has widely been used in the practical project, but the theoretical research of composite foundation is far behind the needs of practical project development, and it is still in continuous exploration.According to the anisotropic inherent characteristics of natural soil in the composite foundation, this paper the variations of bearing capacity and settlement in the static condition, and researched the dynamic characteristics under the earthquake load is revealed.Firstly, considering the Anisotropic of Composite Foundation, soil Transversely Isotropic elastic-plastic model is introduced, based on the Finite Element theory of Composite Foundation established to consider the Finite Element analysis model. The simulation in Bearing Capacity of Composite Foundation- Settlement in the actual engineering curves obtained was compared to verify the correctness of this program.Secondly, considering the Anisotropy of Composite Foundation dynamic analysis, by using Rayleigh damping matrix, asymptotic multi-directional transmission introduction of dual artificial boundary, and we have drawn up the composite foundation elastic-plastic dynamic finite element program. Calculated analysis showed: Composite foundation in a double asymptote multi- directional transmission boundary simulate is more reasonable than the simple use of the results obtained free boundary;At last, the program is used to carry out the simulation analysis of dynamic characteristics for composite foundation in earthquake loads, the simulate conclusions are as follows: In different transversely isotropic parameters, the horizontal displacement of the reinforced zone center in composite foundation is larger than the vertical displacement; Considering the anisotropy in composite foundation accord the fundamental characteristics of soil, the calculated results are more reasonable than the isotropic, which can better meet the security requirements of practical engineering at project time.