Abstract
Bentonite slurry is widely used in underground and geotechnical engineering because of its strong ability of wall protection. Slurry penetration, which is of great significance for the soil stability, is difficult to observe directly during the soil and slurry interaction. Slurry penetration would change the electrical resistivity of soil, which provides an indirect method to monitor the degree of slurry penetration. This paper aimed to investigate the electrical resistivity characteristics of soil-bentonite mixtures. Several test groups with different material components were carried out. The effects of some factors including water environment, CMC (carboxymethyl cellulose) contents, soil particle gradation, and electrode distance on the electrical resistivity of slurry-soil mixtures were studied and the relationship between soil electrical resistivity and slurry concentration was established. The results in this paper can provide references for the application of the electrical method on slurry penetration.
Highlights
Bentonite slurry has been widely employed in underground and geotechnical engineering such as slurry pressure balance (SPB) shield tunneling, horizon directional drilling (HDD), diaphragm wall, and cast-in-place pile, etc. [1,2,3]
This paper aims to characterize the soil-slurry mixtures using the electrical resistivity method
Slurry penetration is an essential stage when used for balancing the earth and water pressure in underground and geotechnical engineering
Summary
Bentonite slurry has been widely employed in underground and geotechnical engineering such as slurry pressure balance (SPB) shield tunneling, horizon directional drilling (HDD), diaphragm wall, and cast-in-place pile, etc. [1,2,3]. Bentonite slurry has been widely employed in underground and geotechnical engineering such as slurry pressure balance (SPB) shield tunneling, horizon directional drilling (HDD), diaphragm wall, and cast-in-place pile, etc. Fresh slurry is pumped to the front of the work face and the muck is taken out by slurry. The bentonite slurry can serve as the medium to support the side wall of the bore hole [4]. The effect of support action depends on the formation and quality of the filter cake [5]. The process of slurry penetration has attracted extensive attention because of its great importance in the formation of filter cakes [6,7]. The observation of slurry penetration is very challenging during the soil–slurry interaction
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