涂抹区重叠竖井地基固结特性研究

doi:10.16285/j.rsm.2019.1427

岩土力学 ›› 2020, Vol. 41 ›› Issue (5): 1560-1566.doi: 10.16285/j.rsm.2019.1427

涂抹区重叠竖井地基固结特性研究

李红坡^{1, 2, 3}，梅国雄^{1, 2, 3}，肖涛^{1, 2, 3}，陈征⁴

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

收稿日期:2019-08-19 修回日期:2019-09-12 出版日期:2020-05-11 发布日期:2020-07-07
通讯作者: 陈征，男，1989年生，博士，主要从事固结理论和渗流理论等方面的研究。E-mail：geozhengchen@gmail.com E-mail:li1994813@126.com
作者简介:李红坡，男，1994年生，硕士研究生，主要从事软土地基固结理论方面的研究工作。
基金资助:
国家自然科学基金项目（No. 51578164，No. 41672296，No. 51878185）；广西自然科学基金创新研究团队项目（No. 2016GXNSFGA380008）。

Study of soil consolidation by vertical drains with overlapping smear zones

LI Hong-po^{1, 2, 3}, MEI Guo-xiong^{1, 2, 3}, XIAO Tao^{1, 2, 3}, CHEN Zheng⁴

1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China; 2. Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning, Guangxi 530004, China; 3. College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China; 4. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China

Received:2019-08-19 Revised:2019-09-12 Online:2020-05-11 Published:2020-07-07
Supported by:
This work was supported by the National Natural Science Foundation of China(51578164, 41672296, 51878185) and the Innovative Research Team Program of Guangxi Natural Science Foundation ( 2016GXNSFGA380008).

摘要/Abstract

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。

关键词: 竖井, 固结, 涂抹区重叠, 地基扰动程度, 竖井最小临界间距

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.

Key words: vertical drains, consolidation, overlapping smear zones, disturbance degree of foundation, the minimum critical spacing

中图分类号:

TU 470

李红坡, 梅国雄, 肖涛, 陈征. 涂抹区重叠竖井地基固结特性研究[J]. 岩土力学, 2020, 41(5): 1560-1566.

LI Hong-po, MEI Guo-xiong, XIAO Tao, CHEN Zheng. Study of soil consolidation by vertical drains with overlapping smear zones[J]. Rock and Soil Mechanics, 2020, 41(5): 1560-1566.

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涂抹区重叠竖井地基固结特性研究

Study of soil consolidation by vertical drains with overlapping smear zones

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