真空联合堆载预压下竖井地基固结解析解

郭彪; 龚晓南; 卢萌盟; 张发春; 房锐

真空联合堆载预压下竖井地基固结解析解 English Version

郭彪^{1, 2},
龚晓南²,
卢萌盟³,
张发春¹,
房锐¹

1. 云南省交通规划设计研究院陆地交通灾害防治技术国家工程实验室，去南昆明 650200; 2. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310027; 3. 中国矿业大学深部岩土力学与地下工程国家重点实验室，江苏徐州 221008

基金项目: 国家自然科学基金项目（51009135）；中国博士后科学基金特别资助项目（2012T50525）

详细信息

作者简介:
郭彪(1982- )，男，四川省安岳人，博士，高级工程师，主要从事软黏土力学、地基处理及边坡工程等方面的研究工作。E-mail: gb25891775@163.com。

中图分类号: TU47
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出版历程
- 收稿日期: 2012-07-17
- 发布日期: 2013-06-19

Analytical solution for consolidation of vertical drains by vacuum-surcharge preloading

1. National Engineering Laboratory for Land Transport Meteorological Disaster Control Technology, Yunnan Provincial Plan, Resign and Research Institute of Communications, Kunming 650200, China; 2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China

摘要

摘要: 考虑真空度沿竖井的发展是一个深度的函数，同时堆载所引起的附加应力既随时间变化也随深度变化，还考虑了地基的径竖向渗流以及扰动区土体水平渗透系数的3种变化模式，推导了真空联合堆载预压下竖井地基固结度的一个较普遍的解析解，并分析了在真空度沿竖井线性下降，堆载线性施加和附加应力沿深度梯形分布等情况下的地基固结性状。结果表明，荷载线性施加时，真空度对地基固结度有较大影响，真空度越大，沿深度衰减越慢，固结越快；而在荷载瞬时施加时，真空度对固结度没有影响。在地基井径比和水平渗透系数与竖向渗透系数之比较小时，地基的竖向渗流对地基的固结度有较大的影响。
- 竖井地基 /
- 固结 /
- 真空联合堆载预压 /
- 解析解
Abstract: A general analytical solution is obtained for the consolidation of vertical sand foundation under vacuum preloading considering simultaneously the variation of vacuum degree, the coupled variation of stress increment with depth and time, the horizontal and vertical drainage and the variation of horizontal permeability coefficient of soil. Furthermore, detailed solutions are obtained for the excess pore water pressure and average degree of consolidation under the particular situation that the vacuum degree linearly changes along the vertical drain depth, the stress increment linearly changes along the column depth and the loading is applied in a single-stage way. Finally, the consolidation behavior of the vertical drain foundation is analyzed. The results show that if the loading is applied linearly, consolidation degrees of foundation have something to do with the vacuum degree, the larger the vacuum is, the faster the consolidation is, the slower the reducing of vacuum is, the faster the consolidation. If the loading is applied instantaneously, consolidation degrees of foundation have nothing to do with the vacuum degree. Ignoring the vertical flow within the soil will under-estimate the consolidation rate. Furthermore, the less the radius ratio is and the less the ratio of horizontal permeability to vertical permeability is, the greater the under-estimated value is.
- vertical drain /
- consolidation /
- vacuum-surcharge preloading /
- analytical solution

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参考文献(7)

[1]	KIELLMAN W Consolidation of clayey soils by atmosphericpressure[C]// Proceedings of a Conference on Soil Stabilisation, Massachusetts Institute of Technology. Boston: MIT Press, 1952: 258-263.
[2]	CHU J, YAN S W, YANG H. Soil improvement by the vacuum preloading method for an oil storage station[J]. Géotechnique, 2000,50(6):625-632.
[3]	INDRARATNA B, BAMUNAWITA C, KHABBAZ H. Numerical modeling of vacuum preloading and field applications[J]. Canadian Geotechnical Journal, 2004,41(6):1098-1110.
[4]	INDRARATNA B, SATHANANTHAN I, RUJIKIATKAMJORN C,et al. Aanlytical and numerical modeling of soft soil stabilized by PVD incorporating vacuum preloading[J]. International Journal of Geomechanics, 2005,5(2):114-124.
[5]	RUJIKIATKAMJORN C, INDRARATNA B. Analytical solutions and design curves for vacuum-assisted consolidation with both vertical and horizontal drainage[J]. Canadian Geotechnical Journal, 2007,44:188-200.
[6]	郭彪,(龚晓南),(卢萌盟),等. 考虑涂抹作用的未打穿砂井地基固结理论分析[J]. (岩石力学与工程学报), 2009,28(12):2561-2568. (GUO Biao, GONG Xiao-nan, LU Meng-meng, et al. Theoretical analysis on partialiy penetrated and drains foundation with consideration on smear effect[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(12): 2561-2568. (in Chinese)
[7]	卢萌盟),(谢康和),(张玉国),等. 考虑土体水平渗透系数变化的复合地基固结解[J]. (浙江大学学报(工学版), 2008,41(11):1996-2001. (LU Meng-meng, XIE Kang-he, ZHANG Yu-guo, et al. Analytical solution for consolidation of composite foundation accounting for variation of soil horizontal permeability coefficient[J]. Journal of Zhejiang University (Engineering Science),2008,41(11): 1996-2001. (in Chinese)