Study of Airtightness of Filter Cake of Paste HDN

MA Hui; ZHU Siran

doi:10.3973/j.issn.2096-4498.2018.S1.003

Tunnel Construction >

2018 , Vol. 38 >Issue S1: 15 - 19

DOI: https://doi.org/10.3973/j.issn.2096-4498.2018.S1.003

Study of Airtightness of Filter Cake of Paste HDN

MA Hui ,
ZHU Siran

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(1. Guangzhou Metro, Guangzhou 510330, Guangdong, China; 2. Guangzhou Mass Transit Engineering Consultant Co., Ltd., Guangzhou 510405, Guangdong, China)

Received date: 2018-01-30

Revised date: 2018-05-23

Online published: 2018-06-19

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Abstract

The airtightness of filter cake of Paste HDN when opening the chamber under pressure is analyzed by laboratory test and theoretical calculation. The analytical results show that: (1) The proportion of free water in the filter cake of Paste HDNwith 3day age is about 10%. (2) Under the pressure of 0.292 MPa, 1.7% of the pore size of the filter cake of Paste HDN with 1∶2 of mudwater ratio of improved clay slurry, 1/20 of plasticizer injection amount and 3day of filming age may leak. (3) The are permeation coefficient the filter cake of Paste HDN rangesfrom 10-8 cm3/s to 10-7 cm3/s, which is 2-3 m3/h when converting to tunnel excavation crosssection with diameter of 6m; and the air compressor can fully meet the airsupply requirements.

Key words： Paste HDN; chamber opening under pressure; seepage gas volume; seepage gas coefficient; filter cake airtightness

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MA Hui , ZHU Siran . Study of Airtightness of Filter Cake of Paste HDN[J]. Tunnel Construction, 2018 , 38(S1) : 15 -19 . DOI: 10.3973/j.issn.2096-4498.2018.S1.003

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