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( ) 第 3 卷第 6 期 江 南 大 学 学 报 自 然 科 学 版 Vol. 3 　No. 6 　 　 　 2004 年 12 月 Journal of Southern Yangtze University( Natural Science Edition) 　　 　 Dec. 　2004 ( ) 　文章编号 :1671 - 7147 2004 06 - 0599 - 05 开挖卸载负孔压的消散对围护结构的影响 李玉岐 , 　谢康和 (浙江大学 岩土工程研究所 ,浙江 杭州 310027) 摘　要 : 分析并讨论了基坑开挖卸载情况下坑底和周围土体中超静孔压的消散规律 ,基于太沙基 扩散方程 ,推导了由于开挖引起的超静孔压和有效应力的计算公式. 通过算例分析研究了超静孔 压消散对围护结构侧压力的影响 ,认为负的超静孔压的消散不利于基坑的稳定 ,快速施工可以充 分利用开挖引起的负孔压. 关键词 : 负超静孔压 ;有效应力 ;卸载 ;基坑开挖 中图分类号: TU 432 文献标识码 : A Influence of Dissipation of Negative Pore Water Pressure on Retaining Structure during Excavation L I Yuqi , 　XIE Kanghe ( Institute of Geotechnical Engineering , Zhejian g University , Hangzhou 310027 , China) Abstract : The dissipation rule of excess pore water pressure induced by unloading in excavation is studied. Analytical formulas for calculating negative excess pore water pressure and effective stress are derived based on Terzaghi ’s diffusion equation. The influence of the dissipation of negative excess pore water pressure on lateral pressure acting on retaining structure is analyzed through a numerical example. The results indicate that the dissipation of negative excess pore water pressure is harmful to the stability of foundation pit and fast construction can make full use of the negative pore water pressure. Key words : negative excess pore water pressure ; effective stress ; unloading ; excavation 　　软土地基的固结计算已经引起了广泛的关注