| 非稳定渗流引起的基坑坑底回弹变形计算 |
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| 引用本文： | 李玉岐,周健,谢康和.非稳定渗流引起的基坑坑底回弹变形计算[J].岩石力学与工程学报,2007,26(A01):2952-2958. |
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| 作者姓名： | 李玉岐 周健 谢康和 |
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| 作者单位： | [1]同济大学地下建筑与工程系,上海200092 [2]上海大学土木工程系,上海200072 [3]浙江大学岩土工程研究所,浙江杭州310027 |
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| 基金项目： | 中国博士后科学基金资助项（20060400672） |
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| 摘 要： | 基于一维非稳定渗流理论,研究大面积开挖基坑且支护墙体刚度较大情况下坑内外水头的变化规律,并推导相应计算公式,进而分析坑底水头、孔隙水压力、有效应力以及回弹变形随时间的变化关系。研究结果表明,开挖卸载引起的超静孔压以及坑内外水头差诱发的渗流共同作用使得坑底孔隙水压力随时间逐渐增加,进而引起坑底有效应力逐渐减小和坑底回弹变形逐渐增加。
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| 关 键 词： | 土力学 基坑 非稳定渗流 有效应力 开挖 回弹变形 |
| 文章编号： | 1000-6915（2007）增1-2952-07 |
| 收稿时间： | 2006-05-28 |
| 修稿时间： | 2006-08-21 |
CALCULATION OF BASE HEAVE OF FOUNDATION PIT INDUCED BY UNSTEADY SEEPAGE |
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| LI Yuqi;ZHOU Jian;XIE Kanghe.CALCULATION OF BASE HEAVE OF FOUNDATION PIT INDUCED BY UNSTEADY SEEPAGE[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(A01):2952-2958. |
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| Authors: | LI Yuqi;ZHOU Jian;XIE Kanghe |
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| Abstract: | Based on one-dimensional unsteady seepage theory,the variation rule of water head inside and outside a foundation pit is investigated under the condition of large-scale excavation and retaining walls with large rigidity;and the corresponding analytical formulas for calculating water head are deduced.The variations of water head,pore water pressure,effective stress and heave of pit base with time are further analyzed.It is shown that excessive pore water pressure induced by unloading and seepage induced by water head difference between the inside and outside of the foundation pit cause the increase of pore water pressure beneath pit base with time,and thus the decrease of soil effective stress and the increase of pit base heave are induced. |
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| Keywords: | soil mechanics foundation pit unsteady seepage effective stress excavation heave |
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