东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (3): 138-144.DOI: 10.12068/j.issn.1005-3026.2025.20239042

• 资源与土木工程 • 上一篇    下一篇

真空预压中排水板参数对处理效果的影响

武亚军1(), 吴明灿1, 陆逸天2, 吴锦津1   

  1. 1.上海大学 力学与工程科学学院,上海 200072
    2.东华大学 环境科学与工程学院,上海 201620
  • 收稿日期:2023-08-15 出版日期:2025-03-15 发布日期:2025-05-29
  • 通讯作者: 武亚军
  • 作者简介:武亚军(1973—),男,山西太谷人,上海大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(42272320)

Influence of Drainage Plate Parameters on Treatment Effect in Vacuum Preloading

Ya-jun WU1(), Ming-can WU1, Yi-tian LU2, Jin-jin WU1   

  1. 1.School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China
    2.College of Environment Science and Engineering,Donghua University,Shanghai 201620,China.
  • Received:2023-08-15 Online:2025-03-15 Published:2025-05-29
  • Contact: Ya-jun WU

摘要:

为进一步优化预制排水板(PVD)布置方式,探讨PVD参数对真空固结效果的影响,在传统PVD理论的基础上,提出小宽度、小间距PVD-真空预压法.在保证PVD材料用量相同的同时,适当调整PVD的宽度与间距以提高真空固结效率.定义时间影响因子Th与真空预压中叠加影响因素F的比值(Th/F)作为表征参数进行固结分析.比较不同参数的PVD,真空固结过程排水量、表层沉降等指标变化.结果表明,当Th/F越大时,土体的固结效率越高.采用宽度和间距分别为25和17 mm的PVD可以有效地提高真空固结效率,相比传统布置方式总排水量提高了约6.9%.采用小宽度、小间距的PVD可以有效缓解抗剪强度沿深度和径向的衰减.由此,可得出在耗材一定的情况下,采用小宽度、小间距PVD结合真空预压法有一定的实践意义.

关键词: 软土地基处理, 真空预压法, 预制排水板参数, 真空固结效率, 颗粒迁移

Abstract:

In order to further optimize the layout of prefabricated vertical drains (PVD) and explore the influence of PVD parameters on the vacuum consolidation effect, based on the traditional PVD theory, a small-width, small-spacing PVD-vacuum preloading method was proposed. This method adjusted the width and spacing of the PVDs appropriately to improve the vacuum consolidation efficiency, while ensuring that the amount of PVD material remained the same value. The ratio of the time impact factor (Th) and superimposed influencing factor (F) in vaccum preloading was defined as the characterization parameter for consolidation analysis. The changes in drainage volume, surface settlement, and other indicators during the vacuum consolidation process under different PVD parameters were compared. The results show that the consolidation efficiency of the soil increases as the Th/F increases. Using PVDs with a width of 25 mm and a spacing of 17 mm can effectively improve the consolidation efficiency, increasing the total drainage volume by approximately 6.9% compared to the traditional layout. In addition, the use of small-width, small-spacing PVDs can effectively alleviate the attenuation of shear strength along depth and radial direction. Therefore, it can conclude that with a fixed material consumption, the use of small-width, small-spacing PVDs combined with vacuum preloading method has certain practical significance.

Key words: soft soil foundation treatment, vacuum preloading method, prefabricated vertical drains(PVD) parameters, vacuum consolidation efficiency, particle migration

中图分类号: