[1]康一,时刚,刘忠玉.基于Hansbo渗流的未打穿砂井地基固结分析[J].郑州大学学报(工学版),2019,40(06):85-89.[doi:10.13705/j.issn.1671-6833.2019.03.003]
　Shi Gang,Koichi,Liu Zhongyu.Consolidation Analysis of Partially Penetrated Sand-drained Foundation Based on Hansob’’ Flow[J].Journal of Zhengzhou University (Engineering Science),2019,40(06):85-89.[doi:10.13705/j.issn.1671-6833.2019.03.003]
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基于Hansbo渗流的未打穿砂井地基固结分析()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
40卷
期数:
2019年06期
页码:
85-89
栏目:
出版日期:
2019-11-16

文章信息/Info

Title:
Consolidation Analysis of Partially Penetrated Sand-drained Foundation Based on Hansob’’ Flow
作者:
康一; 时刚; 刘忠玉
郑州大学土木工程学院
Author(s):
Shi Gang; Koichi; Liu Zhongyu
School of Civil Engineering, Zhengzhou University
关键词:
Hansbo渗流; 未打穿砂井地基; 涂抹区; 固结特性; FlexPDE
Keywords:
ansbo seepage; The foundation of the sand well is not penetrated; smear area; Consolidation properties; FlexPDE
DOI:
10.13705/j.issn.1671-6833.2019.03.003
文献标志码:
A
摘要:
排水固结法是淤泥质土、吹填土等饱和软黏土地基的一种有效加固处理方法。当饱和软黏土层较厚，打穿整个软黏土层不经济或者施工较困难时，可采用未打穿砂井地基的形式。基于Hansob渗流模型，推导了未打穿砂井地基在非Darcy渗流条件下的轴对称固结方程，采用FlexPDE软件对固结方程进行求解，并通过算例验证了本文方法的可靠性。在此基础上，研究了砂井打入深度、Hansob渗流参数和涂抹区对未打穿砂井地基固结的影响规律。结果表明：砂井打入深度对未打穿砂井地基平均固结度的影响显著，砂井打入深度比为0.6时平均固结度达到90%所需时间大约是理想砂井地基的10倍；未打穿砂井地基的平均固结度随Hansob渗流参数m和I1的增大而降低，不考虑Hansob渗流会高估砂井地基的固结度；未打穿砂井地基的平均固结度随涂抹区范围的增大和渗透系数的减小而逐渐降低，且这种影响在固结中期较为显著，在固结后期各种工况的平均固结度差别不大。
Abstract:
Drainage consolidation method is an effective method to improve the soft soil foundation such as muddy soil or fill soil foundation. However, when the soil layer is too thick, the sand drain may not penetrate the whole soft soil foundation due to the construction costs or construction difficulties. In the paper, the investigation is focused on the consolidation of partially penetrated sand-drained foundation, and the governing equations for the consolidation of soft ground with partially penetrated sand drains are put forward by introducing Hansob’s flow model. And the effect of the depth of sand drains, the parameters of Hansob’s flow model and the smear zone on consolidation behaviors is analyzed in detail. The results show that the depth of sand drains can affect the average consolidation degree of sand-drained foundation significantly, and the required consolidation time corresponding to Up=90% is about ten times more than that of ideal sand-drained foundation, when the depth of sand drains is 60% of the total depth of the foundation. The consolidation rate decreases with the increasing of the parametersandof Hansob’s flow, and it also decreases with the increasing of the scope of smear zone and the decreasing of the permeability coefficient of smear zone. Moreover, the scope and the permeability of smear zone have larger effects on the consolidation rate of the partially penetrated sand-drained foundation during the middle state of consolidation, while it has less effects on the consolidation rate during the last stage of consolidation.
更新日期/Last Update: 2019-11-25