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。
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 differenceΔh increases with the increase of the water-stop curtain insertion ratio d,and the relationship betweenΔh 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.
作者
邵朝阳
肖智巧
赵子仪
吴磊
李天义
SHAO Chaoyang;XIAO Zhiqiao;ZHAO Ziyi;WU Lei;LI Tianyi(School of Resource Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Hunan Provincial Geological Hazard Survey and Monitoring Institute Xiangxi Institute,Jishou,Hunan 416000,China)
出处
《南华大学学报（自然科学版）》
2022年第5期29-39,共11页
Journal of University of South China：Science and Technology
基金
湖南省教育厅重点项目(21A0272)。
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
laboratory test
numerical simulation
water-stop curtain insertion ratio
foundation pit precipitation
water retaining effect
