Research Of Dynamic Response And Dynamic Characteristics Of Soil In Field Of Blowing Sand Reclamation Of Beibu Gulf Area

The site of blowing sand reclamation has a distinct causing properties and engineering properties with the natural sedimentary site. The original of deep marine soft soil has become the large area of soft substratum soil of the new land. The soil layer is unconsolidated and continuous disturbance by the outside factors, going through "forming, consolidation, carrying" characteristics. Seismic waves imported from the bedrock can be directly into the marine soft soil covering at the bottom of the sea bedrock directly. In the field, the internal and external dynamic geological effect is more active, and the deep layer of the underlying surface of the thick layer of silt and soft soil is more serious, so it has important significance for the seismic response analysis of the Beibu Gaulf.In this thesis, through the field survey data and the experimental results of inside and outside establish three-dimensional model for calculating dynamic response of blown sand reclamation analysis, With the help of GDS dynamic triaxial apparatus, the beibu Gulf reclamation area soil dynamic characteristics were studied.The main working contents of this paper are as follows:(1) combined with the actual condition of selected projects Beihai TieShan Port representative and Qinzhou Port reclamation site as an analysis example, to analyze its under the earthquake acceleration Fourier spectrum and response spectrum changes. The results showed that Beibu Gulf blowing sand reclamation site amplification low-frequency seismic waves, high-frequency seismic waves obviously filtered.(2) through the dynamic triaxial experiment to research the consolidation confining pressure, to reshape the soft soil of dynamic shear modulus, damping the impact of dynamic load frequency. A certain frequency, soil dynamic shear modulus gradually decreases when dynamic shear strain increases, the dynamic shear strain values determined, along with the greater consolidation confining pressure, the greater the dynamic shear modulus ratio; With the move shear strain increases the damping ratio tended to increase.γd constant, the greater the pressure damping consolidation rather than decrease.(3) Analysis of Beibu Gulf site dynamic effects of blowing sand reclamation site conditions factors, In this paper, groundwater level changes in response to the impact of blowing sand reclamation sites numerical simulation of dynamic expansion, Reclamation site dynamic response analysis of the variation of different groundwater conditions. Overall, the peak ground acceleration amplification factor increases obviously with decreasing of the water depth.(4) Through orthogonal design, analysis the main factors affecting the site dynamic response, selected the orthogonal table of L16(45), determine the reasonable level, arranged the finite element orthogonal experiment of 4 factors 4 levels. Determine the parameters models of 16 groups. The FLAC3D software analysis indicate:the factor of marine soft soil thickness has the greatest impact on reclamation site dynamic response, followed by Sand relative density and Sand thickness, while the water table has the least impact on reclamation site dynamic response.