Properties Research Of The Combined Consolidation Technology Including Low-energy Dynamic Consolidation And Vacuum Dewatering, Applyment In ShenZhen

The combined consolidation technology including low-energy dynamic consolidation and vacuum dewatering has integrated two construction technical characteristics', the dynamic consolidation and the dewatering.It is a new combined consolidation technique, but its research and application is in the stage of juvenility. It lacks systematic and widely research. So it results in the mechanism and theory immature.In some applying project, the design and construction of this method still locate on the test stage when used to deal with saturation soft clay. Research the mechanism of this combined consolidation technology, applying the method to treat the soft clay on ShenZhen bank area, have very important theory meaning and practical worth.Based on the formers' studies and the engineering background, the mechanism of combined consolidation technology have been researched and discussed systematically by theory research, numerical simulation, in-situ test in this paper. The following studies are presented:Firstly, by combining several engineering data of region of ShenZhen, the physics mechanics characteristic of soft clay in alongside the sea region, and correlations between each physics mechanics index with the statistical charts have been analyzed and discussed. The result can be used in design and construction.Secondly, based on the Terzaghi three-dimension consolidation theory, dynamic mechanism, vibration wave press theory, the consolidation mechanism of vacuum dewatering, low-energy dynamic consolidation, low-energy dynamic consolidation combine vacuum dewatering have been expatiated and discussed. The dynamic consolidation mechanism of unsaturated soil and saturated soil also have been researched.Thirdly, the Biot dynamic consolidation equation and continuity equation have been introduced and deduced particularly. According to the consolidation characteristic of low-energy dynamic consolidation, the three-dimension dynamic eight crunode form function has been imported inplane eight crunode dynamic grade unit. The rigid matrix and quality matrix of the three-dimension dynamic eight crunode have been set up, which can be use to make up the theory model of finite element numerical analysis of dynamic consolidation.Fourthly, based on the Biot dynamic consolidation equation, the low-energy dynamic consolidation numerical model has been set up by FLAC-3D method. The boundary condition, begin condition and instantaneous loading model have been enacted. Combining the characteristic of soft clay on ShenZhen area, eight works of low-energy dynamic consolidation have been analyzed numerically by the FLAC-3D model. The result of displacement field, dynamic incidence, settlement, ground vertical displacement have been calculated. The infection on settlement of fall distance, hammer quality and tamper energy have been analyzed.Finally,the combined consolidation technology including low-energy dynamic consolidation and vacuum dewatering had been applied in the treatment project of ninth pool on ShenZhen former gulf. The parameter design, construction request and survey of this method had been introduced. The in-situ test indicated this method can be applied to treat with the large soft ground on ShenZhen. The combined consolidation technology including low-energy dynamic consolidation and vacuum dewatering is a cheap, useful, convenience method, which has good effect. This kind of method can be expanded on ShenZhen.