Experimental study on expansion and creep characteristics of new CF sealing material

被引：0
|
作者：
Zhang T. [1 ,2 ]
Bao R. [3 ]
Li S. [2 ,3 ]
Zhang C. [2 ,3 ]
Zhang L. [3 ]
Jiang X. [1 ]
机构：
[1] School of Science, Xi'an University of Science & Technology, Xi'an, 710054, Shaanxi
[2] Key Laboratory of Western Mine Exploitation& Hazard Prevention of the Ministry of Education, Xi'an, 710054, Shaanxi
[3] School of Safety Engineering, Xi'an University of Science & Technology, Xi'an, 710054, Shaanxi
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 01期
关键词：
CF sealing material; Creep; Expansion preparation time; Expansion-time effect; Pore structure;
D O I：
10.13545/j.cnki.jmse.2019.01.023
中图分类号：
学科分类号：
摘要：
In order to explore the expansion mechanism and creep characteristics of the new CF sealing material, the pore growth, expansion-time effect, expansion mechanism and creep characteristics of this material containing different amount of expansion agent were analyzed through using the mercury porosimeter and DNS-200 electronic universal testing machine. Meanwhile, according to the grading loading results, the Kelvin-Volgt model was selected, and the law of parameters was analyzed. The experimental results show that pores with sizes of 0.1~1 μm and 200 μm obviously grow when the proportion of CF expansion agent increases to the level of 2.0%. While the material expansion rate Pc increases to 11.5%, the rapid expansion time and preparation time reduce to 18min and 12min, respectively. With the prompt increase in load displacement and constant load displacement, the capacity of compressive strength and anti-deformation reflected by the creep model parameters E0, E1 and η1 gradually decrease. Through further analysis on test results, the optimal proportion of expansion agent for CF material is determined in this paper. Above optimal proportion could help to realize the good fluidity, high compressive strength and anti-deformation ability of sealing material for better borehole sealing performance. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：175 / 183
页数：8
相关论文
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