煤屑/聚合物复合注浆材料宏观力学性能与机制分析
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摘要
针对传统注浆材料存在的缺陷、及煤矿井下煤屑处理困难的现状,以钻孔施工产生的煤屑为填料,配以黏结剂等其他添加剂制得煤屑/聚合物复合注浆材料。采用宏观力学性能测试和微观结构观测相结合的方法对复合材料的性能进行研究,结果表明复合材料内煤屑存在一个合理的掺量,煤屑掺量过少对复合材料强度的改善极为有限,而掺量过多会导致煤屑/树脂界面结合力降低,使得复合材料内部形成缺陷,材料较早地发生损伤破坏。红外光谱分析结果说明了煤屑与树脂之间发生了氢键包覆和化学接枝反应,使得树脂基体在煤屑表面形成了牢固的覆盖。在考虑注浆成本的基础上,复合材料中煤屑掺量应控制在30%,此时复合材料具备较高的力学性能,并具有良好的工程应用前景。
In view of the shortcomings of traditional grouting materials and the current status that the coal dust is difficult to deal with in coal mine,the coal dust/polymer composite grouting material was developed in this study,which used the coal dust generated in process of underground drilling construction as filler,and supplemented by the bonding agent and some other additives. The performance of composite material were researched both in macroscopic mechanical properties and microstructural observation,the results show that there exists a suitable additive amount of coal dust in the composite material,too little amount of coal dust will limited the improvement of the composites strength,while too much will lead to the reduce in interfacial binding capacity between coal dust and resin matrix to form the internal defects in the material,and leading to an early damage and failure of the composites. The FTIR results also indicate that the reactions of hydrogen bond coating and the chemical grafting were happened inside the material. Thus,the surfaces of the coal dust were covered firmly by the resin matrix. By considering the cost of the composite material,the additive amounts of coal dust should be controlled at 30%,thus the composites has better mechanical properties and a good engineering application prospects.
In view of the shortcomings of traditional grouting materials and the current status that the coal dust is difficult to deal with in coal mine,the coal dust/polymer composite grouting material was developed in this study,which used the coal dust generated in process of underground drilling construction as filler,and supplemented by the bonding agent and some other additives. The performance of composite material were researched both in macroscopic mechanical properties and microstructural observation,the results show that there exists a suitable additive amount of coal dust in the composite material,too little amount of coal dust will limited the improvement of the composites strength,while too much will lead to the reduce in interfacial binding capacity between coal dust and resin matrix to form the internal defects in the material,and leading to an early damage and failure of the composites. The FTIR results also indicate that the reactions of hydrogen bond coating and the chemical grafting were happened inside the material. Thus,the surfaces of the coal dust were covered firmly by the resin matrix. By considering the cost of the composite material,the additive amounts of coal dust should be controlled at 30%,thus the composites has better mechanical properties and a good engineering application prospects.
引文
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[17]VENNAPUSA P K R,ZHANG Y,WHITE D J.Comparison of pavement slab stabilization using cementitious grout and injected polyurethane foam[J].Journal of Performance of Constructed Facilities,2016,30(6):04016056.
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[19]邹恒,董文洋,岳春波,等.化学接枝对碳纤维结构及其复合材料的影响[J].高分子材料科学与工程,2015,31(8):68-73.(ZOUHeng,DONG Wenyang,YUE Chunbo,et al.Effect of chemical grafting reactions on surface structures of carbon fibers and its composites[J].Polymer Materials Science and Engineering,2015,31(8):68-73.(in Chinese))
[2]XIA T Q,ZHO,F B,LIU J S,et al.Evaluation of the pre-drained coal seam gas quality[J].Fuel,2014,130(130):296-305.
[3]王永龙,宋维宾,孙玉宁,等.瓦斯抽采钻孔堵塞段力学模型及其应用[J].重庆大学学报,2014,37(9):119-127.(WANG Yonglong,SONG Weibin,SUN Yuning,et al.Clogging mechanical model and its application in gas extraction borehole[J].Journal of Chongqing University,2014,37(9):119-127.(in Chinese))
[4]佟瑞鹏,张磊,杜志托,等.煤矿井下不同作业场所的职业健康风险定量评价[J].中国安全生产科学技术,2016,12(2):123-127.(TONG Ruipeng,ZHANG Lei,DU Zhituo,et al.Quantitative evaluation on occupational health risk in different working places of underground coal mine[J].Journal of Safety Science and Technology,2016,12(2):123-127.(in Chinese))
[5]HUANG Q,HONAKERR.Optimized reagent dosage effect on rock dust to enhance rock dust dispersion and explosion mitigation in underground coal mines[J].Powder Technology,2016,301:1 193-1 200.
[6]LU J,JIANG S,TAO J,et al.Analysis of dust to evaluate the incidence of pneumoconiosis in Huainan coal mines[J].Analytical Letters,2016,49(11):1 783-1 793.
[7]孙晓明,陈峰,梁广峰,等.防膨胀软岩注浆材料试验及应用研究[J].岩石力学与工程学报,2017,36(2):457-465.(SUNXiaoming,CHEN Feng,LIANG Guangfeng,et al.Experimental and application research on grouting material for preventing swelling of soft rock[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(2):457-465.(in Chinese))
[8]MOLLAMAHMUTO?LU M,AVCI E.Ultrafine portl and cement grouting performance with or without additives[J].Ksce Journal of Civil Engineering,2015,19(7):2 041-2 050.
[9]王朝强,谭克锋,黎泽明,等.粉煤灰基灌浆材料的制备及性能[J].材料科学与工程学报,2013,31(6):919-923.(WANG Chaoqiang,TAN Kefeng,LI Zeming,et al.Preparation and properties of fly ash base grouting materials[J].Journal of Materials Science and Engineering,2013,31(6):919-923.(in Chinese))
[10]GOLEWSKI G L.Improvement of fracture toughness of green concrete as a result of addition of coal fly ash,characterization of fly ash microstructure[J].Materials Characterization,2017,134:335-346.
[11]高翔,魏亚,王复明,等.聚氨酯注浆材料在循环压缩加载下疲劳性能与微观结构演化[J].复合材料学报,2017,34(3):550-556.(GAO Xiang,WEI Ya,WANG Fuming,et al.Fatigue resistant and microstructure evolution of polyurethane grout materials under uniaxial compression[J].Acta Materiae Compositae Sinica,2017,34(3):550-556.(in Chinese))
[12]CHUN B S,RYU D.S.A study on applications of polyurethane injection material for ground improvement[J].Ksce Journal of Civil Engineering,2000,4(2),113-118.
[13]冯志强,康红普,韩国强.煤矿用无机盐改性聚氨酯注浆材料的研究[J].岩土工程学报,2013,35(8):1 559-1 564.(FENG Zhiqiang,KANG Hongpu,HAN Guoqiang.Polyurethane grouting materials modified by inorganic salts in coal mines[J].Chinese Journal of Geotechnical Engineering,2013,35(8):1 559-1 564.(in Chinese))
[14]ARKHIPOV V A,PALEEV D Y,PATRAKOV Y.F,et al.Coal dust wettability estimation[J].Journal of Mining Science,2014,50(3):587-594.
[15]HOWLADAR M F,KARIM M M.The selection of backfill materials for barapukuria underground coal mine,dinajpur,bangladesh:insight from the assessments of engineering properties of some selective materials[J].Environmental Earth Sciences,2015,73(10):6 153-6 165.
[16]李娇阳,李凯琦.煤表面润湿性的影响因素[J].煤炭学报,2016,41(增2):448-453.(LI Jiaoyang,LI Kaiqi.Influence factors of coal surface wettability[J].Journal of China Coal Society,2016,41(Supp.2):448-453.(in Chinese))
[17]VENNAPUSA P K R,ZHANG Y,WHITE D J.Comparison of pavement slab stabilization using cementitious grout and injected polyurethane foam[J].Journal of Performance of Constructed Facilities,2016,30(6):04016056.
[18]刘鸿翔,赵捷,李侃社,等.热处理对无烟煤/聚苯胺复合材料电容性能的影响[J].材料科学与工程学报,2017,35(3):450-454.(LIU Hongxiang,ZHAO Jie,LI Kanshe,et al.Effect of heat treatment on capacitance property of anthracite/polyaniline composite[J].Journal of Materials Science and Engineering,2017,35(3):450-454.(in Chinese))
[19]邹恒,董文洋,岳春波,等.化学接枝对碳纤维结构及其复合材料的影响[J].高分子材料科学与工程,2015,31(8):68-73.(ZOUHeng,DONG Wenyang,YUE Chunbo,et al.Effect of chemical grafting reactions on surface structures of carbon fibers and its composites[J].Polymer Materials Science and Engineering,2015,31(8):68-73.(in Chinese))