真空预压加固软土地基变形与固结计算研究

›› 2011, Vol. 32 ›› Issue (S1): 149-154.

真空预压加固软土地基变形与固结计算研究

张仪萍，严露，俞亚南，刘伟超

浙江大学建筑工程学院，杭州 310058

收稿日期:2010-10-08 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:张仪萍，男，1973年生，博士，主要从事地基处理、岩土工程监测、基坑围护结构等教学科研工作

Solutions for settlement and consolidation of soft ground with vacuum preloading

ZHANG Yi-ping, YAN Lu, YU Ya-nan, LIU Wei-chao

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

Received:2010-10-08 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 考虑真空度的衰减情况，对真空预压加固软基的变形和固结度计算方法进行了研究。先根据真空预压时砂井的真空压力状态建立了真空预压的空间轴对称变形模型，用位移法推导该模型在等应变条件下的变形及体积应变计算公式。在此基础之上结合Hansbo砂井地基固结理论和真空预压的边界条件，推导了忽略竖向渗流情况下的真空预压加固软土地基的固结解析解。比较文中计算方法与已有计算理论和现场试验实测资料结果表明，体积应变的计算对真空预压的孔压和固结度的计算有较大的影响，而直接引用传统堆载预压的体积应变计算公式计算会导致较大误差。在固结度计算中，采用Hansbo的近似方法能满足计算精度的要求，所得计算结果与实测结果吻合较好

关键词: 软土地基, 真空预压, 真空度衰减, 变形, 固结

Abstract: Solutions for settlement and consolidation calculation of soft ground with vacuum preloading are studied by considering the loss of vacuum. Firstly, an axisymmetric deformation model is developed under equal strain condition according to the vacuum pressure condition of sand drain with vacuum preloading. Formulae of deformation and volumetric strain are derived from spatial axisymmetric displacement control functions by using the displacement method. Then combining the obtained volumetric strain functions and the existing Hansbo’s sand drain foundation consolidation theory, and modifying some boundary conditions with vacuum preloading, analytical solutions for consolidation of soft ground under vacuum preloading are conducted when vertical water flow in soil is neglected. Finally, a comparison between the present solution and some previous solutions is made, and compared those theoretical solutions to test data in situ too. The results show that the volumetric strain has great effects on pore pressure and consolidation calculations; it would lead to large errors in consolidation calculation of vacuum preloading while quoting the volume strain formula of surcharge preloading directly. And using Hansbo's approximate method to calculate degree of consolidation can meet the requirements of precision; the calculation results are in good agreement with experimental results

Key words: soft ground, vacuum preloading, vacuum loss, deformation, consolidation

中图分类号:

TU 447

张仪萍，严露，俞亚南，刘伟超. 真空预压加固软土地基变形与固结计算研究[J]. , 2011, 32(S1): 149-154.

ZHANG Yi-ping, YAN Lu, YU Ya-nan, LIU Wei-chao. Solutions for settlement and consolidation of soft ground with vacuum preloading[J]. , 2011, 32(S1): 149-154.

参考文献

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