瓦斯抽采钻孔CF固化膨胀封孔材料性能研究
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摘要
针对传统常见瓦斯抽采钻孔封孔材料中存在的固化收缩、初凝过快和强度不足等问题,为保证井下瓦斯抽采效果,研发出CF固化膨胀封孔材料。CF材料以普通水泥为主料,配入一定质量比的缓凝剂、稳定剂和膨胀剂,并与一定水混合搅拌后制成封孔浆液材料。测试对比了CF材料与普通水泥、聚氨酯及膨胀水泥在初凝时间、黏度、膨胀性能和强度4个方面的参数,并得出CF材料各成分配比的优劣性。研究结果表明:CF材料在料水比为5∶3、缓凝剂质量比含量为1.5%~2%、膨胀剂质量比含量为2%~3%下具有流动性较好、黏度较高、膨胀体积和稳定膨胀时间适中的特点,且具有较高的抗压强度,材料4种性能参数均优于其他常见封孔材料。
Aiming at the issues of solidify shrinkage,too fast initial setting time and lack of strength that exists in the traditional sealing material for gas extraction drilling,CF solidify expansion sealing material is developed to insure gas extraction of coal mines. CF material is based on Portland cement,mixed with a certain ratio of retarder,stabilizers and bulking agents,and blended with amount of water. Tests compared CF material with ordinary cement,polyurethane and expanded cement in four areas of parameters which are the initial setting time,viscosity,expansion and strength. Also the ratio of each component in CF material is compared. The results show that CF material has better mobility,higher viscosity,expansion and stabilization moderate expansion time characteristics,and has a high compressive strength under the condition that the solid water ratio is 5∶ 3,retarder mass ratio is 1. 5% to 2% and expansion mass ratio is 2% to 3%. Meanwhile,four performance parameters are superior to other common sealing materials.
Aiming at the issues of solidify shrinkage,too fast initial setting time and lack of strength that exists in the traditional sealing material for gas extraction drilling,CF solidify expansion sealing material is developed to insure gas extraction of coal mines. CF material is based on Portland cement,mixed with a certain ratio of retarder,stabilizers and bulking agents,and blended with amount of water. Tests compared CF material with ordinary cement,polyurethane and expanded cement in four areas of parameters which are the initial setting time,viscosity,expansion and strength. Also the ratio of each component in CF material is compared. The results show that CF material has better mobility,higher viscosity,expansion and stabilization moderate expansion time characteristics,and has a high compressive strength under the condition that the solid water ratio is 5∶ 3,retarder mass ratio is 1. 5% to 2% and expansion mass ratio is 2% to 3%. Meanwhile,four performance parameters are superior to other common sealing materials.
引文
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[10]孙文标,李红行,董新照,等.注浆封孔材料的性能及其膨胀机理研究[J].有色金属(矿山部分),2010(6):73-74.
[2]程远平,付建华,俞启香.中国煤矿瓦斯抽采技术的发展[J].采矿与安全工程学报,2009(2):127-139.
[3]李敏.煤矿聚氨酯封孔的试验研究[D].北京:中国地质大学(北京),2011:56-58.
[4]张超,林柏泉,周延,等.本煤层近水平瓦斯抽采钻孔“强弱强”带压封孔技术研究[J].采矿与安全工程学报,2011(6):935-939.
[5]王兆丰,武炜.煤矿瓦斯抽采钻孔主要封孔方式剖析[J].煤炭科学技术,2014(6):31-34.
[6]翟成,向贤伟,余旭,等.瓦斯抽采钻孔柔性膏体封孔材料封孔性能研究[J].中国矿业大学学报,2013(6):982-988.
[7]向贤伟,翟成,李敏,等.瓦斯抽采钻孔新型柔性膏体封孔材料研究[J].煤矿安全,2014(8):23-26.
[8]刘三钧,林柏泉,郝志勇,等.钻孔密封机理及新型煤层瓦斯压力测定技术研究[J].中国煤炭,2009(10):96-99.
[9]周明凯,张文生,李北星.高水速凝固结材料性能和硬化机理研究[J].武汉工业大学学报,1998(4):18.
[10]孙文标,李红行,董新照,等.注浆封孔材料的性能及其膨胀机理研究[J].有色金属(矿山部分),2010(6):73-74.