Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays

LIU Zhong-yu; ZHANG Tian-hang; MA Chong-wu

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Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays

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- Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays
- Vol. 28, Issue 3, (2007)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU431
- Online First：28 August 2013，
  
  Published：2007
- 稿件说明：
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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]. 2007, 28(3).
DOI：

LIU Zhong-yu, ZHANG Tian-hang, MA Chong-wu. Effect of initial hydraulic gradient on one-dimensional consolidation of saturated clays[J]. 2007, 28(3). DOI：

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。

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.

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