Experimental research on creep characteristics of aquifer sand sediments in Xican under high stress
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Abstract:
For a better understanding of the mechanism of land subsidence in Xi can, a high2stress consolidation system was de 2 signed, and several tests on the medium2 to fine 2grained sand sediments were conducted under different stresses. T he variations of overlaying pressure and water table of confined aquifer were simulated using the system, and one 2dimensional creep deforma 2 tion tests were conducted under high stress. T he results showed that ( 1) the creep characteristics of aquifer sand is not only af2 fected by the magnitude of effective stress but also the stress history; (2) when the confined water level decreases, the compres2 sive deformation of sand samples shows obvious creep characteristics; (3) when the confined water level increases, the sand samples begin to expand but the creep characteristics are insignificant; and ( 4) according to the comparison of laser granularity analysis curve and scanning electron microscope before and after the tests, the creep deformation of aquifer sand is not only re 2 lated to the slip dislocation but also the fracture of sand sediments. The generalized Kelvin model was proposed to characterize the creep deformation of aquifer sand in Xi can based on the summary of experiments and deformation mechanism. The five rheo2 logical parameters in the generalized Kelvin odel were not constant but varied with the effective stress.
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