Research On The Characteristics Of Consolidation Creep Of Marine Soft Soil Experiment In The Occurrence Environment

In order to investigate the characteristics of consolidation creep and microstructure of marine soft soil under the influence rule of the occurrence environment, this thesis takes marine soft soil collected from reclamation area of Fangchenggang of Guangxi as the research object and adopts the mechanism simulation technology to imitate the occurrence environment which makes the artificial sample "imprinted" with occurrence environment elements; then the property of macromechanics of marine soft soil is obtained through the indoor conventional mechanical test and the consolidation creep test. Also the research takes advantage of SEM technology and image processing software to analyze the change rule of microstructure of marine soft soil. And the research comprehensively analyzes consolidation creep deformation of marine soft soil under the influence of the change of occurrence environment in order to provide evidence for the engineering design.The main research contents and results of this thesis are as follows:1. Through a three-month period of "soak-loading apparatus", the research "imprinted" environment elements into marine soft soil and also finds that the environment elements have effects on the property of consolidation settlement of marine soft soil.2. Through the shear test and the permeability test, the research gets findings as follows:the increase of the overlying load plays a leading role in the decrease of the permeability coefficient and the increase of the concentration of calcium ions also has some effects on it which can not be ignored, especially when the overlying load is not large. Both the increase of the overlying load and the increase of the concentration of calcium ions can cause the enlargement of the index of c and φ of the marine soft soil. Overlying load mainly affects the value c and calcium ions largely affect φ of the sample especially put in the dense calcium ions solution.3. Through the consolidation creep deformation test, the research gets findings are as follows:Ca2+can increase the structural strength of marine soft soil. At this time it is more proper to call preconsolidation pressure as yield strength. With the increasing of the overlying load and the concentration of calcium ions, the property of marine soft soil consolidation compression may decrease. When the overlying load is increasing, the consolidation creep deformation will be decreasing. The bigger the overlying load is, the shorter the time of consolidation creep is; the increase of the concentration of calcium ions will reduce the deformation of the consolidation creep, but it doesn’t obviously affect the speed the consolidation creep of the sample soil. Both overlying load and the concentration of calcium ions influence the soft soil secondary consolidation coefficient. When the overlying load or the concentration of calcium ions increases, the nonlinear property of the soft soil will decrease. In addition, the increasing of the overlying load and the concentration of calcium ions can strengthen the long-term shearing resistance of the marine soft soil.4. The characteristics of macromechanics are deeply understood by doing research on microstructure of sample soil before and after its creeping with scanning electron microscope and IPP software.