洞庭湖區(qū)軟土固結(jié)特性研究
[Abstract]:The relevant data of soft soil in Dongting Lake region are collected, and the geology of Dongting Lake area is studied and analyzed in detail. The basic geotechnical tests of the undisturbed soil in Dongting Lake region were carried out in the laboratory, and the basic physical and mechanical parameters of the soil samples were obtained. Through regression analysis, the correlation expressions between different physical and mechanical parameters and moisture content were obtained. It can be found that the soft soil in Dongting Lake area has high moisture content and low strength, the soil quality is fine and the composition of soft silt is more. In this paper, the advanced consolidation instrument of GDS is described in detail, and the working principle, composing system, operating mode, advantages and disadvantages of the instrument are analyzed and introduced. By using GDS advanced consolidation system, the soft soil in Dongting Lake was subjected to graded loading consolidation test. According to the different drainage methods, vertical drainage consolidation test and radial drainage consolidation test were carried out successively, and the porosity ratio of the sample under different drainage conditions was analyzed. Compression coefficient, compression modulus and consolidation coefficient. According to the experimental results, the consolidation deformation characteristics of soil samples under different control conditions are analyzed. The continuous loading consolidation test was studied systematically, and the iso-strain rate and equal load rate consolidation tests of soft soil in Dongting Lake region were carried out, and the results were compared with those of graded loading consolidation test. The consolidation characteristics of soil samples under different loading and drainage conditions are compared and analyzed. It is found that under different consolidation conditions the soil samples exhibit the same mechanical properties when the effective stress in the soil samples is the same. The nonlinear permeability model and nonlinear compression model of soft soil are analyzed. The parameters of nonlinear compression model and nonlinear permeability model of soft soil in Dongting Lake region are obtained through the above experimental results. Taking into account the nonlinear variation of compressibility and permeability coefficient in the process of soil consolidation, the one-dimensional nonlinear consolidation model of saturated soft soil is established, and the analytical solution of the equation is obtained, and the results are compared and analyzed.
【學(xué)位授予單位】:湖南科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU447
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