| 衡盾泥在带压开舱时的闭气保压效果研究 |
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| 引用本文： | 马卉,祝思然.衡盾泥在带压开舱时的闭气保压效果研究[J].隧道建设,2018,38(Z1):15-19. |
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| 作者姓名： | 马卉 祝思然 |
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| 作者单位： | (1. 广州地铁集团有限公司， 广东 广州 510330； 2. 广州轨道交通建设监理有限公司， 广东 广州 510405) |
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| 摘 要： | 为研究衡盾泥在带压开舱时的闭气保压效果，通过室内试验及理论计算的方法对衡盾泥的泥膜气密性进行分析。结果表明： 1）3 d龄期的衡盾泥泥膜中自由水所占比例约为10％； 2）在0.292 MPa压力下，改良黏土浆体泥水质量比为1∶2、塑化剂掺入质量比为1/20、成膜龄期为3 d的衡盾泥泥膜，仅1.7％的孔隙可能出现渗气； 3）衡盾泥泥膜渗气系数为10-8~10-7 cm3/s,换算到直径为6 m的隧道开挖断面上，泥膜的渗气量为2~3 m3/h，盾构开舱时配置的空压机完全满足补气条件。
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| 关 键 词： | 衡盾泥 带压开舱 渗气量 渗气系数 泥膜气密性 |
| 收稿时间： | 2018-01-30 |
| 修稿时间： | 2018-05-23 |
Study of Air tightness of Filter Cake of Paste HDN |
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| MA Hui,ZHU Siran.Study of Air tightness of Filter Cake of Paste HDN[J].Tunnel Construction,2018,38(Z1):15-19. |
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| Authors: | MA Hui ZHU Siran |
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| Institution: | (1. Guangzhou Metro, Guangzhou 510330, Guangdong, China; 2. Guangzhou Mass Transit Engineering Consultant Co., Ltd., Guangzhou 510405, Guangdong, China) |
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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 cm3/s to 10-7 cm3/s, which is 2-3 m3/h when converting to tunnel excavation cross section with diameter of 6m; and the air compressor can fully meet the air supply requirements. |
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| Keywords: | Paste HDN chamber opening under pressure seepage gas volume seepage gas coefficient filter cake air tightness |
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