泥浆
膨润土
渗透(HVAC)
滤饼过滤器
岩土工程
瓜尔胶
导水率
发掘
材料科学
护盾
地质学
复合材料
环境科学
土壤水分
环境工程
化学
土壤科学
岩石学
生物化学
作者
Huayang Lei,X. Liu,Fuqian Shi,Chaolei Ma
出处
期刊:Geotechnique Letters
[Thomas Telford Ltd.]
日期:2022-09-01
卷期号:12 (3): 161-166
被引量:1
标识
DOI:10.1680/jgele.22.00003
摘要
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.
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