On the dissipation of negative excess porewater pressure induced by excavation in soft soil
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- 作者：Li Yu-qi (1) liyuqi2000@hotmail.com
Ying Hong-wei (1)
Xie Kang-he (1) - 关键词：Key words Negative excess porewater pressure ; Effective stress ; Earth pressure ; Excavation
- 刊名：Journal of Zhejiang University - Science A
- 出版时间：March 2005
- 出版年：2005
- 期刊代码：pc538_1673-565x
- 类别：et
- 卷：6
- 期：3
- 页码：188-193
- 数据来源：sp
摘要
Unloading induces negative excess porewater pressure in soil mass around a foundation pit during excavation. In this work, the dissipation rule of negative excess porewater pressure after excavation was studied. Analytical formulas for calculating the negative excess porewater pressures and the effective stresses were derived based on one-dimensional consolidation theory and Terzaghi's effective stress principle. The influence of the dissipation of negative excess porewater pressure on earth pressure inside and outside a foundation pit and the stability of the retaining structure were analyzed through a numerical example. It was indicated that the dissipation of negative excess porewater pressure is harmful to the stability of the retaining structure and that rapid construction can make full use of the negative porewater pressure.