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Experimental study of salt-resisting slurry for undersea shield tunnelling

机译：海底盾构隧道耐盐泥浆的试验研究

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For undersea shield tunnelling projects, selection of a suitable slurry ingredient is a challenging issue due to the presence of massive ions. As a result it may be adverse for the formation of filter cake at the tunneling face, which would lead to a face instability. Using xanthan gum (XG) as an addictive to traditional sodium bentonite slurries was proposed in this paper. SEM images revealed that XG utilize its 'wrapping effect' to effectively alleviate the decrease in the Russian funnel viscosity caused by electrolytes present in seawater and to improve the control of water loss. The influences of XG contents on slurry properties under different salty water conditions were explored through a series of laboratory tests. When the seawater content exceeds 30%, the change in XG content required to maintain the basic properties of the mud is insensitive to increase in seawater content. The quality of filter cake and infiltration features of the developed slurries under medium coarse sand and fully-weathered rock strata conditions were evaluated through slurry infiltration tests. It was found that the bentonite water ratio is mainly related to the properties of the strata, and XG content is determined by the seawater content.
机译：对于海底盾构隧道工程，由于存在大量离子，选择合适的泥浆成分是一个具有挑战性的问题。结果，这不利于在隧道面处形成滤饼，这将导致面不稳定。本文提出了使用黄原胶（XG）作为传统的钠膨润土浆料的成瘾剂。 SEM图像显示XG利用其“包裹效应”有效缓解了海水中存在的电解质引起的俄罗斯漏斗粘度的降低，并改善了水分流失的控制。通过一系列的实验室测试，探讨了XG含量对不同咸水条件下浆料性能的影响。当海水含量超过30％时，维持泥浆基本特性所需的XG含量变化对海水含量的增加不敏感。通过泥浆渗透试验，评价了中粗砂和全风化岩层条件下已开发泥浆的滤饼质量和入渗特性。发现膨润土的水比主要与地层的性质有关，而XG的含量则取决于海水的含量。

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