考虑井周水泥土渗透系数变化的竖井地基固结研究
PDF下载 (168)张晨豪,邓岳保,周靓凤.考虑井周水泥土渗透系数变化的竖井地基固结研究[J].宁波大学学报(理工版),2023,36(6):93-99.DOI:10.20098/j.cnki.1001-5132.2023.0525
ZHANG Chenhao,DENG Yuebao,ZHOU Liangfeng.Consolidation research of vertical drains foundation considering the variation of permeability coefficient of cemented soil around the well[J].Journal of Ningbo University(Natural Science & Engineering Edition),2023,36(6):93-99.DOI:10.20098/j.cnki.1001-5132.2023.0525
| Title: | Consolidation research of vertical drains foundation considering the variation of permeability coefficient of cemented soil around the well |
| 作者: | 张晨豪, 邓岳保, 周靓凤 |
| Author(s): | ZHANG Chenhao, DENG Yuebao, ZHOU Liangfeng |
| 关键词: | 渗透系数; 水泥土; 涂抹区; 固结; 超静孔压 |
| Keywords: | permeability coefficient; cement soil; smear zone; consolidation; excess pore water pressure |
| 分类号: | TU470 |
| DOI: | 10.20098/j.cnki.1001-5132.2023.0525 |
| 文献标识码: | A |
| 摘要: | 水泥土渗透特性对滨海软土地区植入式排水桩排水固结效果影响显著. 本文首先开展水泥土抽排水固结试验, 研究水泥土渗透系数随时间变化的性质; 然后假定水泥土为竖井地基涂抹区, 建立涂抹区渗透系数随时间呈指数衰减的固结方程, 得到真空负压下竖井固结解析解. 在此基础上, 分析水泥土固化影响因子?、涂抹区径长rs和涂抹区的初始渗透系数ks0对软土地基固结性状的影响. 结果表明 水泥土固化作用对固结速率影响显著, 水泥土的渗透性对桩周土体的固结效果起着控制作用; 随着??变大, 桩侧土体固结效果逐渐减弱; rs越小, ks0越大, 桩周土体固结速率越快. |
| Abstract: | The influence of cement soil permeability characteristics on the drainage consolidation effect of implanted drainage piles in coastal soft soil areas is significant. Firstly, a hydraulic soil pumping and drainage consolidation test was carried out to study the nature of the hydraulic soil permeability coefficient with time. Then the hydraulic soil was assumed to be the coated area of the vertical drain foundation, and the consolidation equation with exponential decay of the permeability coefficient in the coated area with time was established to obtain the analytical solution of vertical drains consolidation under negative vacuum pressure. On this basis, the effects of the cementing influence factor ?, the diameter length rs of the smear zone and the initial permeability coefficient ks0 of the smear zone on the consolidation properties of the soft ground foundation were analyzed. The results show that the cementation effect on consolidation rate is significant, and the permeability of the cement plays a controlling role in the consolidation effect of the soil around the pile; as ? becomes larger, the consolidation effect of the soil on the pile side gradually decreases; the smaller the diameter length rs of the smear zone and the larger the initial permeability coefficient ks0, the faster the consolidation rate of the soil around the pile. |
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| 备注/Memo: | 收稿日期:2023-05-26.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:浙江省基础公益研究计划（LGG21E080005）;宁波市“科技创新2025”重大专项（2023J004）. 第一作者:张晨豪（1999－）,男,浙江嘉兴人,硕士研究生,主要研究方向:软土地基与固结理论.E-mail:780503443@qq.com *通信作者:邓岳保（1983－）,男,湖南岳阳人,博士/教授,主要研究方向:软土地基处理.E-mail:dengyuebao@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
