| Effect of Initial Hydraulic Gradient on Consolidation of Sand drained Ground Improved by Vacuum Preloading |
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| 作者姓名： | ZHOU Qi DENG Zhi yong WANG You yuan and ZHANG Feng |
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| 作者单位： | Engineering Technology Research Co. Lth. of CCCC Fourth Harbor Engineering Co. Lth., Guangzhou 510230, P.R.China;Engineering Technology Research Co. Lth. of CCCC Fourth Harbor Engineering Co. Lth., Guangzhou 510230, P.R.China;Engineering Technology Research Co. Lth. of CCCC Fourth Harbor Engineering Co. Lth., Guangzhou 510230, P.R.China;Engineering Technology Research Co. Lth. of CCCC Fourth Harbor Engineering Co. Lth., Guangzhou 510230, P.R.China |
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| 摘 要： | Because of the existence of initial hydraulic gradient in clay, non Darcy equation with initial hydraulic gradient was modified with classical consolidation theories of sand drained ground.And the approximate solution in the instance of vacuum preloading was presented.Based on this, the effect of initial hydraulic gradient on the seepage front, the pore water pressure and the average degree of consolidation were investigated.It was found that the spread of vacuum pressure was delayed because of initial hydraulic gradient, resulting in the dissipation of pore water pressure and the speed of soil layer consolidation.The hysteresis became more and more evident with the increase of initial hydraulic gradient.In addition, initial hydraulic gradient also caused some residual pore water pressure which could not reach vacuum pressure.Thus, the ultimate average degree of consolidation was less than 100%, which decreased with the increase of initial hydraulic gradient.
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| 关 键 词： | initial hydraulic gradient non Darcy seepage seepage front vacuum preloading sand drained ground |
| 收稿时间： | 2009-12-12 |
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