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Experimental study on property change of slurry and filter cake of slurry shield under seawater intrusion

机译：海水入侵下泥浆盾构泥浆和滤饼性能变化的试验研究

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摘要

During submarine tunnels construction by the slurry shield tunneling method, seawater may enter the pressure chamber from excavation surface and mix with the slurry. This will cause the physical stability of the slurry to change and will also affect the properties of the filter cake and the stability of the excavation surface. This study aims to investigate the effect of seawater on the properties of the slurry and the filter cake using laboratory experiments. Mixtures of slurry and seawater in different ratios were prepared and the physical stability, viscosity, and zeta potential of the slurries were tested. The basic properties and microstructure of the filter cake formed by the different slurries were also investigated. The results showed that the intrusion of seawater significantly reduced the physical stability and the zeta potential of the slurry. As the seawater content in the slurry was increased, the void ratio in the filter cake formed by the slurry decreased and the filter cake permeability coefficient increased from 10(-8) cm/s to 10(-7) cm/s. In the filter cakes formed by slurries containing some seawater, soil particles in aggregates were more tightly packed with more intra-aggregate pores and better connectivity than the seawater-free filter cake. The decrease in zeta potential was the fundamental reason for both the slurry's change in physical stability and the changes in filter cake properties.
机译：在通过泥浆盾构法施工海底隧道的过程中，海水可能会从开挖面进入压力室并与泥浆混合。这将导致泥浆的物理稳定性发生变化，并且还将影响滤饼的性能和挖掘面的稳定性。本研究旨在通过实验室实验研究海水对浆料和滤饼性能的影响。制备了不同比例的浆料和海水的混合物，并测试了浆料的物理稳定性，粘度和ζ电势。还研究了由不同浆料形成的滤饼的基本性能和微观结构。结果表明，海水的入侵显着降低了浆料的物理稳定性和ζ电势。随着浆料中海水含量的增加，由浆料形成的滤饼中的空隙率降低，并且滤饼的渗透系数从10（-8）cm / s增加至10（-7）cm / s。在由含海水的浆液形成的滤饼中，集料中的土壤颗粒比无海水滤饼更紧密地堆积着更多的集料内部孔隙和更好的连通性。 zeta电位的降低是浆料物理稳定性变化和滤饼性能变化的根本原因。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第6期|290-299|共10页
  • 作者

    Min Fanlu; Du Jiarui; Zhang Nan; Chen Xuguang; Lv Huanjie; Liu Laicang; Yu Chaojie;

  • 作者单位

    Hohai Univ, Minist Educ, Key Lab Geomech & Embankment Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

    Univ Texas Arlington, Dept Civil Engn, Arlington, TX 76019 USA;

    Ocean Univ China, Shandong Prov Key Lab Ocean Engn, Qingdao 266100, Shandong, Peoples R China;

    Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Slurry shield; Seawater; Slurry; Filter cake; Zeta potential;

    机译：泥浆屏蔽;海水;泥浆;滤饼;Zeta电位;

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