考虑地下水位影响的砂井地基强度增长计算

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Abstract The actual development of shear strengths of soft soils in the thick hydraulic reclaimed foundations improved by the technology of pumped vacuuming combined with heaped preloading was qualitatively analyzed in terms of the principle of effective stresses and the method of stress paths. The development of soil shear strength under the groundwater level was found to be different from that of above the groundwater level. An analytical solution for soil shear strengths considering the effect of groundwater levels was therefore derived based on the theory of the uniqueness of effective stresses. The increments of soil shear strength at different depths after the dissipation of the excess pore water pressure under constant load in an area at Gaolan，Zhuhai seaport were calculated with the derived analytical solution. Comparisons with the results from the unconfined compression test and triaxial compression test revealed that the averaged error between the calculated and measured values is only 8.0% in terms of the undrained shear strength and is only 3.2% in terms of the shear strength in soil failure surface. Therefore，the calculated results based on the analytical solution agree well with the measured results.

Key words： foundation;sand drain foundation;ground water level;principle of effective stress;stress paths uniqueness of effective stress;analytical solution of strength increasing

Received: 18 June 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I6/1269

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