适于弱胶结软岩的新型冻结孔封孔材料性能及微结构研究

我国西部地区的弱胶结软岩,岩石强度低,遇水泥化,当采用全深冻结时,冻结壁解冻后时常出现下部冻结管串水,导致工作面涌水和淹井的安全事故。针对这些问题,本文研究适于这种地层的新型冻结孔封孔材料的工作性、强度以及受冻后的抗渗性,并从受冻后的材料的孔结构和SEM形貌来探讨其机理。结果表明：新型冻结孔封孔材料具有很好的流动性,且流动度损失小,浆体的保水性好,无泌水;其3,28 d的抗折、抗压强度都明显高于普通水泥浆,且经受-30℃的低温受冻28 d后的强度损失小;新型冻结孔封孔材料受冻后,开始出现渗水的水压以及渗水范围扩大时的水压要比普通水泥浆封孔材料提高1~2 MPa。微观试验表明：新型封孔材料与普通...

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Bibliographic Details
Published in煤炭学报 no. 4; pp. 595 - 599
Main Author 刘娟红 纪洪广 贺震平 周晓敏
Format Journal Article
LanguageChinese
Published 2013
Subjects
冻结孔
封孔材料
微结构
抗渗性
Online AccessGet full text
ISSN0253-9993

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Summary:我国西部地区的弱胶结软岩,岩石强度低,遇水泥化,当采用全深冻结时,冻结壁解冻后时常出现下部冻结管串水,导致工作面涌水和淹井的安全事故。针对这些问题,本文研究适于这种地层的新型冻结孔封孔材料的工作性、强度以及受冻后的抗渗性,并从受冻后的材料的孔结构和SEM形貌来探讨其机理。结果表明：新型冻结孔封孔材料具有很好的流动性,且流动度损失小,浆体的保水性好,无泌水;其3,28 d的抗折、抗压强度都明显高于普通水泥浆,且经受-30℃的低温受冻28 d后的强度损失小;新型冻结孔封孔材料受冻后,开始出现渗水的水压以及渗水范围扩大时的水压要比普通水泥浆封孔材料提高1~2 MPa。微观试验表明：新型封孔材料与普通水泥浆封孔材料相比,总孔隙面积降低、中值孔径减小、孔隙率降低,容重和表观密度增加,混凝土结构密实。
Bibliography:freezing hole ; sealing materials ; impermeability ; microstructure
11-2190/TD
LIU Juan-hong ,JI Hong-guang ,HE Zhen-ping ,ZHOU Xiao-min （ 1. State Key Lab of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083 China;2. Inner Mongolia Menggeqin Coal Mine Co. ,Ltd. ,Baotou 017316,China）
The weakly cemented soft rock in the western region of China has low strength and argillization. With a full deep freezing, at the lower part of the pipe, it often appears water coming from the top part of the pipe when the hole wall thaws, which is likely to result in hazards like gushing water in work place and flooding. Therefore, this study will investigate the material for new type freezing hole＇ s sealing in terms of its workability, strength and impermeability after it is frozen in this type of stratum. The study looks into its mechanism from the aspects of pore structure after frozen and SEM morphology. The results indicate that new type freez
ISSN:0253-9993