Study of soil consolidation by vertical drains with overlapping smear zones

LI Hong-po; MEI Guo-xiong; XIAO Tao; CHEN Zheng

doi:10.16285/j.rsm.2019.1427

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Study of soil consolidation by vertical drains with overlapping smear zones

更新时间：2026-06-25

- Study of soil consolidation by vertical drains with overlapping smear zones
- Vol. 41, Issue 5, Pages: 1560-1566(2020)
- 作者机构：
  
  1. 广西大学工程防灾与结构安全教育部重点实验室,广西,南宁,530004
  2. 广西大学广西防灾减灾与工程安全重点实验室,广西,南宁,530004
  3. 广西大学土木工程学院,广西,南宁,530004
  4. 武汉大学水工岩石力学教育部重点实验室,湖北,武汉,430072
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.1427
  CLC： TU472
- Online First：07 July 2020，
  
  Published：2020
- 稿件说明：
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LI Hong-po, MEI Guo-xiong, XIAO Tao, et al. Study of soil consolidation by vertical drains with overlapping smear zones[J]. 2020, 41(5): 1560-1566.
DOI：

LI Hong-po, MEI Guo-xiong, XIAO Tao, et al. Study of soil consolidation by vertical drains with overlapping smear zones[J]. 2020, 41(5): 1560-1566. DOI： 10.16285/j.rsm.2019.1427.

摘要

在软基处理工程中，经常出现竖井打设变密而地基固结效率降低的现象。鉴于此，建立了重叠涂抹区内土体水平向渗透系数的分布函数，给出了涂抹区重叠时竖井地基超静孔压和平均固结度的解析解。通过分析不同工况下竖井地基固结度随竖井间距的变化情况，探究了竖井间距减小而地基固结效率不增反减的成因。最后，探讨了涂抹作用和井阻作用对竖井最小临界间距的影响。结果表明：相邻竖井涂抹区重叠是竖井地基中出现竖井最小临界间距的根本原因。涂抹作用越大，则竖井最小临界间距越大；具体表现为当地基扰动程度增大时或涂抹区半径增大时，竖井最小临界间距随之增大。井阻作用越大，则竖井最小临界间距越小；具体表现为当竖井渗透系数减小时、竖井长度增大时或竖井半径减小时，竖井最小临界间距随之减小。

Abstract

In the soft foundation treatment projects

the phenomenon that the spacing of vertical drains reduces when the consolidation efficiency of the foundation decreases often appears. Given this

the distribution function of horizontal permeability coefficient of soil in overlapping smear zones is established

and then the analytical solutions are obtained for the excess pore pressure and average degree of consolidation of vertical drains foundation with overlapping smear zones. Based on the analysis of the variation of the average degree of consolidation of the foundation with the spacing of the vertical drains for different cases

the reasons are explored when the spacing of the vertical drains reduces and the consolidation efficiency of the foundation decreases. Finally

we discussed the influence of the smear effect and well resistance effect on the minimum critical spacing of vertical drains. The results show that the overlapping of smear zones of adjacent vertical drains is the underlying reason for the minimum critical spacing of vertical drains in the foundation. The greater the smear effect is

the greater the minimum critical spacing of vertical drains is. The specific performance is that the minimum critical spacing of vertical drains increases with the increase of the disturbance degree of the foundation or the radius of the smear zones. The larger the well resistance is

the smaller the minimum critical spacing of vertical drains is. When the permeability coefficient of the vertical drain decreases

the length of the vertical drain increases or the radius of the vertical drain decreases

and the minimum critical spacing of vertical drains decreases accordingly.

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