Evaluating Test on Compactness of Filter Cakes of Excavation Face in Slurry Shield Under Reverse Water Pressure(in English)

MIN Fan-lu, XU Jing-bo, SONG Hang-biao, BAI Yu-xin, DU Jia-rui

China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (8) : 216-221,246.

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China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (8) : 216-221,246.

Evaluating Test on Compactness of Filter Cakes of Excavation Face in Slurry Shield Under Reverse Water Pressure(in English)

  • MIN Fan-lu1,2, XU Jing-bo2, SONG Hang-biao2, BAI Yu-xin2, DU Jia-rui2
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Abstract

In order to accurately evaluate the compactness of filter cakes formed on excavation face in slurry shield under reverse water pressure, a slurry infiltration apparatus available to apply reverse water pressure was used to carry out six groups of slurry infiltration tests under different pressure conditions. According to measuring changes of discharged water yield and pore water pressure in the stratum and recording the thickness and water content of filter cakes, a series of indexes including the coefficient of slurry infiltration, dry density of filter cakes and the effective conversion rate of slurry pressure were calculated. The differences of the compactness of filter cakes under different pressure conditions and formation mechanism were analyzed. The results indicate that the conversion rate of effective slurry pressure decreases, resulting from the existing of reverse water pressure. Hence, the void ratio and permeability coefficient of filter cakes become larger but the dry density is smaller. It indicates that the structure of filter cakes is looser. The compactness of filter cakes could be evaluated more accurately by using the ratio of the discharged water yield as well as the volume of filter cake. The larger the ratio is, the more soil particles are contained in the unit volume of filter cake and the more compact the structure of filter cake is. The results will be significant for evaluating the quality of filter cakes and the stability analysis of excavation face in slurry shield.

Key words

shield tunnel / evaluation of compactness of filter cake / slurry infiltration test / slurry shield / filter cake / reverse water pressure

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MIN Fan-lu, XU Jing-bo, SONG Hang-biao, BAI Yu-xin, DU Jia-rui. Evaluating Test on Compactness of Filter Cakes of Excavation Face in Slurry Shield Under Reverse Water Pressure(in English)[J]. China Journal of Highway and Transport, 2017, 30(8): 216-221,246

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