| 邵朝阳,肖智巧,赵子仪,吴磊,李天义.止水帷幕对开挖后降水引发深基坑渗流场变化的控制效果[J].南华大学学报(自然科学版),2022,(5):29~39.[SHAO Chaoyang,XIAO Zhiqiao,ZHAO Ziyi,WU Lei,LI Tianyi.The Effect of Water-stop Curtain on the Variation of Seepage Field of Deep Foundation Pit Caused by Dewatering after Excavation[J].Journal of University of South China(Science and Technology),2022,(5):29~39.] |
| 止水帷幕对开挖后降水引发深基坑渗流场变化的控制效果 |
| The Effect of Water-stop Curtain on the Variation of Seepage Field of Deep Foundation Pit Caused by Dewatering after Excavation |
| 投稿时间：2022-04-11 |
| DOI：10. 19431/ j. cnki. 1673-0062. 2022. 05. 005 |
| 中文关键词: 室内试验 数值模拟 止水帷幕插入比 基坑降水 挡水效果 |
| 英文关键词:laboratory test numerical simulation water-stop curtain insertion ratio foundation pit precipitation water retaining effect |
| 基金项目:湖南省教育厅重点项目(21A0272) |
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| 中文摘要: |
| 利用室内模型与ABAQUS有限元软件分析潜水砂土基坑降水和开挖工况下止水帷幕插入深度对坑外水位降深的变形机理和规律。根据试验结果与数值模拟结果,对止水帷幕插入比和相应的基坑内外水头差进行拟合分析,并对Boltzmann拟合方程进行求导。结果表明:1)水头差Δh随着止水帷幕插入比d的增加而增加,Δh与d之间的关系符合Boltzmann拟合曲线,曲线可被划分为初始缓变、中期剧变和末期缓变三个阶段;2)室内试验与值模拟结果d有效值分别为80%、67.4%,对所得有效值d进行修正,修正系数为1.14;3)当插入比大于等于有效值时,墙体内外水头差较大,能有效发挥其阻水效果。 |
| 英文摘要: |
| The indoor model and ABAQUS finite element software were used to analyze the deformation mechanism and law of the water level outside the pit caused by the insertion depth of the water-stop curtain under the dewatering and excavation conditions of the submerged sand foundation pit. According to the test results and numerical simulation results, the fitting analysis of the water-stop curtain insertion ratio and the corresponding water head difference inside and outside the foundation pit is carried out, and the Boltzmann fitting equation is derived. The results show that:1) The head difference Δh increases with the increase of the water-stop curtain insertion ratio d, and the relationship between Δh and d conforms to the Boltzmann fitting curve. 2) The effective value d of the indoor test and value simulation results are 80% and 67.4% respectively, and the obtained effective value d is corrected, and the correction coefficient is 1.14; 3) When the insertion ratio is greater than or equal to the effective value, the difference of the water head inside and outside the wall is large, which can effectively exert its water blocking effect. |
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