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DOI: https://doi.org/10.11988/ckyyb.20250437

免滤膜秸秆排水体滤层渗透特性及孔隙特征研究

  • 卞夏 , 1 ,
  • 王澍凯 1 ,
  • 刘超 , 2 ,
  • 蒋澳 3 ,
  • 徐桂中 2, 4
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  • 1.河海大学 岩土力学与堤坝工程教育部重点实验室，南京 210098
  • 2.盐城工学院 土木工程学院，江苏 盐城 221051
  • 3.东华理工大学 土木与建筑工程学院，南昌 330013
  • 4.盐城工业职业技术学院 建筑工程学院，盐城 224005
刘 超(1992-)，男，江苏盐城人，讲师，博士，主要从事环境岩土工程。E-mail:

卞 夏（1988-），男，安徽宣城人，教授，博士，主要从事特殊土力学及理论方面的研究。E-mail: 。

收稿日期: 2025-05-15

  修回日期: 2025-07-05

  网络出版日期: 2025-09-01

基金资助

国家自然科学基金项目(52478364)

收起

Study on the Permeability and Pore Characteristics of the Filter Layer in the Non-filter Membrane Straw Drainage Bodies

  • BIAN Xia , 1 ,
  • WANG Shu-kai 1 ,
  • LIU Chao , 2 ,
  • JIANG Ao 3 ,
  • XU Gui-zhong 2, 4
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  • 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
  • 2. School of Civil Engineering, Yancheng Institute of Technology, Yancheng 221051, China
  • 3. School of Civil Engineering and Architecture, East China University of Technology, Nanchang 330013, China
  • 4. School of Construction Engineering, Yancheng Industrial Vocational and Technical College, Yancheng 2240054, China

Received date: 2025-05-15

  Revised date: 2025-07-05

  Online published: 2025-09-01

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摘要

在真空预压处理疏浚淤泥时，免滤膜秸秆排水体具有无需滤膜和防淤堵的优势，具有良好的应用前景。然而，目前对秸秆滤层的渗透特性及其孔隙特征尚不清楚，影响了其推广运用。本研究结合室内渗透试验与CT扫描，探究了免滤膜秸秆排水体在真空预压下的渗透特性与孔隙结构演化规律。结果表明：免滤膜秸秆排水体滤层空隙占总体积的31.42%，缝隙结构是孔隙结构的14倍，具有纵横连通的排水通道，渗透性能优于传统土工织物滤膜。其反滤体系渗透系数随真空预压时间增长先迅速下降后趋于稳定，稳定值高出过滤黏土的土工织物一个数量级，且滤层厚度增加和初始含水率降低均会使其渗透系数降低。反滤体系中的秸秆滤层在真空预压下缝隙结构减少孔隙结构增加的结构变化实现了“保土-透水”功能的平衡。免滤膜秸秆排水体反滤体系的渗透特性与空隙结构演化规律为疏浚淤泥绿色加固技术的工程应用提供了理论依据。

关键词： 免滤膜秸秆排水体; 真空预压; 渗透特性; 疏浚淤泥; 自反滤层

本文引用格式

卞夏 , 王澍凯 , 刘超 , 蒋澳 , 徐桂中 . 免滤膜秸秆排水体滤层渗透特性及孔隙特征研究[J]. 长江科学院院报, 2025 . DOI: 10.11988/ckyyb.20250437

Abstract

During vacuum preloading treatment of dredged sludge, the non-filter membrane straw drainage body offers significant advantages, such as eliminating the need for filter membranes and resisting clogging, making it a promising solution for practical applications. However, the permeability characteristics and pore structure of the straw filter layer remain poorly understood, limiting its widespread adoption. This study investigates the permeability behavior and pore structure evolution of the non-filter membrane straw drainage body under vacuum preloading through laboratory permeability tests and CT scanning. Results show that the straw filter layer occupies 31.42% of the total volume, with fissure structures accounting for 14 times the volume of pore structures, forming a vertically and horizontally interconnected drainage network. The permeability performance of the non-filter membrane straw drainage body is superior to that of conventional geotextile filter membranes. The permeability coefficient of the non-filter membrane straw drainage body filtration system decreases rapidly and then stabilizes with increasing vacuum preloading time, ultimately reaching a stable value an order of magnitude higher than that of geotextiles used for clay filtration. Additionally, increasing the filter layer thickness and reducing the initial water content both lead to lower permeability coefficients. Under vacuum preloading, the structural transition of the straw filter layer—from a fissure-dominated to a pore-dominated structure—achieves a balance between soil retention and water permeability. These findings provide theoretical support for the engineering application of the non-filter membrane straw drainage body filtration systems in environmentally sustainable dredged sludge stabilization.

Key words： non-filter membrane straw drainage body; vacuum preloading; permeability characteristics; dredged slurry; self-filtration layer

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