摘要
为了寻找新型矿用CF材料适宜的膨胀性能,对材料的膨胀和蠕变特性进行研究,分别利用压汞仪和DNS-200电子万能试验机等系统,对不同膨胀剂占比量水平下新型CF材料的孔隙发育、膨胀-时间效应、膨胀机理及蠕变特性进行了测试分析,并且根据分级加载结果选择Kelvin-Volgt模型对其参数规律进行了分析。结果表明:CF材料膨胀剂占比量水平增加至2.0%时,孔径范围为0.1～1μm和200μm左右内的孔隙发育明显;材料最终膨胀率Pc加速增大至11.5%的同时,快速膨胀时间和膨胀准备时间快速减小至18 min和12 min;随着加载位移量和恒载位移量急剧增大,蠕变模型参数E0,E1,η1反映出的抗压抗变形能力逐渐减弱。通过对试验结果的进一步分析,优化了CF材料的膨胀剂占比量,满足了井下封孔过程中对材料良好流动性和较高抗压抗变形能力的要求。
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 18 min and 12 min, respectively. With the prompt increase in load displacement and constant load displacement, the capacity of compres sive 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.
作者
张天军
包若羽
李树刚
张超
张磊
蒋兴科
ZHANG Tianjun;BAO Ruoyu;LI Shugang;ZHANG Chao;ZHANG Lei;JIANG Xingke(School of Science,Xi'an University of Science & Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Mine Exploitation & Hazard Prevention of the Ministry of Education,Xi'an,Shaanxi 710054,China;School of Safety Engineering,Xi'an University of Science & Technology,Xi'an,Shaanxi 710054,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第1期175-183,共9页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51774234
51474172
51504189)
国家自然科学基金科学仪器基础研究专款项目(51327007)
作者简介
张天军(1971-),男,陕西省西安市人,博士,教授,博士生导师,从事矿山灾害力学方面的研究。E-mail:tianjun_zhang@126.com Tel:13201827306.
