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真空预压在有轨电车软土地基中的应用及数值模拟研究

庄妍, 王晓东, 崔晓艳

庄妍, 王晓东, 崔晓艳. 真空预压在有轨电车软土地基中的应用及数值模拟研究[J]. 岩土工程学报, 2016, 38(zk1): 141-146. DOI: 10.11779/CJGE2016S1026
引用本文: 庄妍, 王晓东, 崔晓艳. 真空预压在有轨电车软土地基中的应用及数值模拟研究[J]. 岩土工程学报, 2016, 38(zk1): 141-146. DOI: 10.11779/CJGE2016S1026
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ZHUANG Yan, WANG Xiao-dong, CUI Xiao-yan. Application of vacuum preloading with vertical drains in soft soil foundation of rapid-transit tram and numerical simulation[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(zk1): 141-146. DOI: 10.11779/CJGE2016S1026
Citation: ZHUANG Yan, WANG Xiao-dong, CUI Xiao-yan. Application of vacuum preloading with vertical drains in soft soil foundation of rapid-transit tram and numerical simulation[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(zk1): 141-146. DOI: 10.11779/CJGE2016S1026
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真空预压在有轨电车软土地基中的应用及数值模拟研究  English Version

  • 1. 河海大学土木与交通学院岩土工程研究所,江苏 南京 210098;
    2. 河海大学土木与交通学院,江苏 南京 210098

基金项目: 国家自然科学基金面上项目（51478166）; 教育部留学回国人员科研启动基金项目; 中央高校基本科研业务费专项资金资助（2015B06014,2015B17814）
详细信息
    作者简介:

    庄 妍(1982- ),女,江苏邳州人,教授,博士生导师,主要从事软土地基加固等方面的教学和科研工作。E-mail: joanna_zhuang@163.com。

    通讯作者:

    崔晓艳

Application of vacuum preloading with vertical drains in soft soil foundation of rapid-transit tram and numerical simulation

  • 1. Geotechnical Research Institute, Dept. of College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
    2. Dept. of College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

施引文献

    摘要
  • 摘要: 近年来真空预压法在软土地基处理中得到广泛应用,基于南京某有轨电车软土地基真空预压处理工程实例进行数值模拟研究。对比加固区沉降、孔压结果可以看出：数值模拟结果偏大于现场监测结果,误差约为2.4%~32.5%,验证了数值模型的正确性。通过变化塑料排水板的通水能力、间距、打设深度影响因素,可以看出：塑料排水板打设深度对软土表面的沉降影响较大。通过沉降和孔隙水压力估算软土的固结度分别为93.4%和88.3%,说明了真空预压法对该软土地基的加固效果明显。
    Abstract: Due to the requirements for the rate of settlement and the increase in the undrained shear strength upon consolidation, the vacuum preloading with vertical drains has been widely used to reinforce soft ground. A field case study improved by the vacuum preloading with vertical drains in Nanjing, China is introduced. A numerical model is established based on the field case. The measurements including vertical settlement at the surface of subsoil, multi-level settlement at the centerline of the subsoil and pore water pressure at different depths are presented and compared with the numerical results. The numerical results overestimate the measurements in the field with the differences in the range of 2.4%~32.5%, which validates the accuracy of the numerical model. By conducting the comparison analysis of parameters including length, permeability coefficient and spacing of prefabricated vertical drains (PVDs), it is found that the length of PVDs is the most influential factor for the maximum surface settlement of soft soils. The degree of consolidation at the final stage of vacuum preloading is 93.4% assessed based on the settlement, and is 88.3% estimated according to the pore water pressure. It is demonstrated that the vacuum preloading with vertical drains is an effective method to reinforce soft soils.
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    • 参考文献(13)
  • [1] 龚晓南. 地基处理手册[M].北京:中国建筑工业出版社, 2008. (GONG Xiao-nan. Foundation treatment manual[M]. Beijing: China Architecture & Building Press, 2008. (in Chinese))
    [2] 高志义.真空预压法的机理分析[J]. 岩土工程学报, 1989, 11(4): 45-56. (GAO Zhi-yi. Analysis on mechanics of vacuum preloading method[J]. Chinese Journal of Geotechnical Engineering, 1989, 11(4): 45-56. (in Chinese))
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    [6] VOOTTIPRUEX P, BERGADO D T, LAM L G, et al. Back-analyses of flow parameters of PVD improved soft Bangkok clay with and without vacuum preloading from settlement data and numerical simulations[J]. Geotextiles and Geomembranes, 2014, 42(5): 457-467.
    [7] LIU H L, CUI Y L, SHEN Y, et al. A new method of combination of electroosmosis, vacuum and surcharge preloading for soft ground improvement[J]. China Ocean Engineering, 2014, 28(4): 511-528.
    [8] HANSBO S. Consolidation of clay by band-shaped prefabricated drains[J]. Ground Eng, 1979, 12(5): 16-25.
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    [10] 陈 环, 鲍秀清. 负压条件下土的固结有效应力[J]. 岩土工程学报, 1984, 6(5): 39-47. (CHEN Huan, BAO Xiu-qing. Consolidation effective stresses in soil under the negative pressure condition[J]. Chinese Journal of Geotechnical Engineering, 1984, 6(5): 39-47. (in Chinese))
    [11] 阎澍旺, 陈 环. 用真空加固软土地基的机制与计算方法[J]. 岩土工程学报, 1986, 8(2): 35-44. (YAN Shu-wang, CHEN Huan. Mechanism and calculation methods of vacuum stabilization of soft clay[J]. Chinese Journal of Geotechnical Engineering, 1986, 8(2): 35-44. (in Chinese))
    [12] ASAOKA A. Observational procedure of settlement prediction[J]. Soils Foundations, 1978, 18(4): 87-101.
    [13] CHU J, YAN S. Estimation of degree of consolidation for vacuum preloading projects[J]. International Journal of Geomechanics, 2005, 5(2): 158-165.
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出版历程
  • 收稿日期:  2015-11-29
  • 发布日期:  2016-03-24

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