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Journal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.1, No. 46)

Publication Date:

Authors : ; ;

Page : 75-84

Keywords : water-logged soil; filtration consolidation; pore pressure; soil deformation; creep; base construction; ground array underground structure.;

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To rewet soils are saturated soils, which don’t have a composition free of water, that move in capillary and gravitational form, that is interstitial water in a free state by its own weight does not move. For the movement of this water require additional pressure, which creates a conversion to the free interstitial water or the temperature for conversion water into steam. To water-logged soils include bog, half-bog soils, sod-podzolic, carbonized and clay soils, cation exchange capacity of more than 30 mg per 100 g of soil and exchangeable cations are included in the vast amount of hydrogen and aluminum. These soils are not fixed binders such as portland cement, slag cement, polymer and selikat solutions. It should be noted that the process of filtration consolidation takes place during compression in water-logged soil for a very long time t, so we can assume that the pore pressure Uw (t) takes place at a different time, where: Stage I − corresponds to the initial stress-strain state, and the stress field forms in the skeleton and pore water when apply external load, but the filtering process has not spread to the interior of the array of soil waterlogging. This state does not continue long, but has already begun the development of filtration consolidation. Stage II − corresponds to the time t, when in the soil originate compression of the pore water of the entire volume of water-logged array and begins dissipation of excess pore pressure and ends with the complete dissipation of excess pore pressure and compaction of solids by squeezing pore water in the pore space. Stage III − corresponds to the end of the stress-strain state water-logged soil, when all the pressure σ of the load perceive by soil skeleton and definitely deformed due to the change of creep solids. The duration of the creep process of the skeleton is almost less then during the full squeezing pore water or the process of consolidation and compaction, or duration of the second stage. The duration of the volumetric creep may take longer during the operation building which built on water-saturated and water-logged soil foundation. That can express by a hereditary creep theory or theory of aging. In this study conducted research water-logged soils in the modified and natural conditions. We got the coefficients of relative compressibility, which allow us to determine the values of the neutral pressure in the pore water and describe the processes of filtration consolidation, solids densification process and creep processes. In the solid particles of the soil occurs nonlinear distortion after filtration consolidation with compacting water-logged soil. It was possible to identify the stages of formation and development of stress-strain state of waterlogged soil masses under compression.

Last modified: 2016-07-20 21:49:00