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Infiltration behaviour into sand of bentonite slurry with guar gum
Géotechnique Letters ( IF 2.1 ) Pub Date : 2022-06-20 , DOI: 10.1680/jgele.22.00003
H. Lei 1, 2, 3 , X. Liu 1 , F. Shi 1 , C. Ma 1
Affiliation  

Bentonite slurry is widely used in various projects due to its excellent engineering properties. The behaviour of slurry infiltration, especially filter cake formation, is directly related to the effect of slurry. This paper proposes an improved apparatus to investigate the infiltration of a novel bentonite slurry, especially in the dynamic infiltration process of the slurry-driven shield, which provides significant references for tunnel excavation. According to monitoring indicators of water discharge volume, pore-water pressure and electrical conductivity, the hydraulic conductivity of filter cake and the major zone of infiltration were analysed. Besides, the results of scanning electron microscopy reveal the micro-interaction between slurry and the soil. The results illustrate that the bentonite slurry with guar gum could immediately form an external filter cake with an infiltrated zone. The external filter cake formed again with a denser bentonite clay platelet network after excavation in the condition of relatively short excavation distance. Therefore, this kind of slurry could rapidly stabilise the excavation surface in slurry-driven shield tunnelling.

中文翻译:

瓜尔胶对膨润土浆液砂的渗透行为

膨润土浆由于其优良的工程性能被广泛应用于各种工程。浆液的渗透行为,尤其是滤饼的形成,直接关系到浆液的效果。本文提出了一种改进的装置来研究一种新型膨润土浆液的渗透,特别是在浆液驱动盾构的动态渗透过程中,为隧道开挖提供了重要的参考。根据出水量、孔隙水压力和电导率等监测指标,对滤饼的导水率和主要入渗带进行分析。此外,扫描电子显微镜的结果揭示了泥浆与土壤之间的微观相互作用。结果表明,含有瓜尔胶的膨润土浆液可以立即形成具有渗透区的外部滤饼。在开挖距离相对较短的情况下,开挖后的外部滤饼再次形成了更致密的膨润土片晶网络。因此,这种泥浆可以快速稳定泥浆驱动盾构隧道开挖面。
更新日期:2022-06-20
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