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| 起始水力梯度对饱和黏土一维固结的影响 | |
| 引用本文： | 刘忠玉,张天航,马崇武.起始水力梯度对饱和黏土一维固结的影响[J].岩土力学,2007,28(3):467-470. |
| 作者姓名： | 刘忠玉 张天航 马崇武 |
| 作者单位： | 1. 郑州大学,土木工程学院,郑州,450001 2. 郑州大学,环境与水利工程学院,郑州,450001 3. 东莞理工学院,建筑工程系,东莞,523808 |
| 基金项目： | 河南省教育厅自然科学基金;东莞理工学院教授、博士科研启动基金 |
| 摘 要： | 采用考虑起始水力梯度的非Darcy渗流方程，修正了Terzaghi饱和黏土一维固结理论，给出了相应的有限差分格式，并据此探讨了起始水力梯度对渗流前锋、孔隙水压力和土层固结度的影响。计算结果表明，如果起始水力梯度大于0，离排水面较远土层的渗流就存在滞后现象，这样土层的固结要慢于Terzaghi固结理论。此时土层的最终平均固结度小于1，这可归结为土层中存在一定的残余孔隙水压力无法完全消散的缘故。 |
| 关 键 词： | 固结理论 非Darcy渗流 起始水力梯度 有限差分 |
| 文章编号： | 1000-7598-（2007）03-0467-04 |
| 收稿时间： | 2005-04-13 |
| 修稿时间： | 2005-04-13 |
Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays |
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| LIU Zhong-yu,ZHANG Tian-hang,MA Chong-wu.Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays[J].Rock and Soil Mechanics,2007,28(3):467-470. | |
| Authors: | LIU Zhong-yu ZHANG Tian-hang MA Chong-wu |
| Institution: | 1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 2. School of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China; 3. Department of Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China |
| Abstract: | Terzaghi’s one-dimensional consolidation theory is modified based on the non-Darcy seepage equation considering the initial hydraulic gradient, and the finite difference scheme is introduced. The effects of the initial hydraulic gradient on the seepage front, the pore water pressure and the degree of consolidation are thereby investigated. The analytical results indicate that, for the soil with the initial hydraulic gradient greater than zero, the hysteretic appearance of seepage flow in the soil layer apart from the drainage boundary makes the rate of consolidation less than that by applying Terzaghi’s consolidation theory. In addition, it is validated that the ultimate value of average degree of consolidation is less than 1 since there exists some residual pore pressure which cannot be completely dissipated in the soil layer. |
| Keywords: | consolidation theory non-Darcy seepage initial hydraulic gradient finite difference |
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