龄期对膏体充填材料力学特性的影响
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摘要
为研究膏体充填体强度力学特性随龄期的变化规律,在充分考虑现场膏体充填体具体配比及养护环境的基础上,采用现场取芯制备实验试件并依据抗拉强度及单轴抗压强度计算试样内摩擦角及黏聚力,并进行回归分析。结果表明,充填材料的内摩擦角约为24°~36°,与龄期相关性弱;抗拉强度、单轴抗压强度、黏聚力均表现出随龄期增长并最终维持在1个稳定值的特性,且初期强度发展快,随后增速平缓。但因井下充填体处于一定的应力环境中,对充填体有一定的压实作用,整体强度较实验室制备试样偏高。
In order to study the changing laws of the strength and mechanical properties of paste filling body with age, the concrete proportion of the paste filling body and the curing environment on the basis of the field were considered, the friction angle and cohesion of the specimen were calculated by using the site coring and the tensile strength and uniaxial compressive strength, and the regression analysis was carried out. The results showed that the internal friction angle of the filling material was about 24° to 36°, and the correlation was weak with the age. The tensile strength, uniaxial compressive strength, cohesion showed the property increased with the increase of the age and finally maintained at a stable value, and the initial strength developed rapidly, and then the growth rate was gentle. However, because the underground filling body is in a certain stress environment, it has a certain compaction effect on the filling body, and the strength is higher than that of the sample prepared in the laboratory all the time.
In order to study the changing laws of the strength and mechanical properties of paste filling body with age, the concrete proportion of the paste filling body and the curing environment on the basis of the field were considered, the friction angle and cohesion of the specimen were calculated by using the site coring and the tensile strength and uniaxial compressive strength, and the regression analysis was carried out. The results showed that the internal friction angle of the filling material was about 24° to 36°, and the correlation was weak with the age. The tensile strength, uniaxial compressive strength, cohesion showed the property increased with the increase of the age and finally maintained at a stable value, and the initial strength developed rapidly, and then the growth rate was gentle. However, because the underground filling body is in a certain stress environment, it has a certain compaction effect on the filling body, and the strength is higher than that of the sample prepared in the laboratory all the time.
引文
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[2]吴爱祥,王勇,王洪江.膏体充填技术现状及趋势[J].金属矿山,2016,481(7):1-9.
[3]瞿群迪,周华强,柏建彪,等.煤矿膏体充填开采工艺的探讨[J].煤炭科学技术,2004,32(10):67-69.
[4]李向阳,刘进良,赵景礼,等.煤矸石充填胶凝材料活化技术[J].煤矿安全,2013,44(4):99-102.
[5]崔增娣,宋恒虎.煤矸石凝石似膏体充填材料的制备及其性能[J].煤炭学报,2010,35(6):896-899.
[6]赵才智,周华强,柏建彪,等.膏体充填材料强度影响因素分析[J].辽宁工程技术大学学报,2006,25(6):904-906.
[7]何利辉,贾尚昆,陈超群,等.煤矿膏体充填材料力学变形性能的试验研究[J].煤矿安全,2011,42(5):20.
[8]邓代强,高永涛,姚中亮.胶结充填材料力学特性影响因素回归分析[J].有色金属,2008,60(4):120-124.
[9]陈磊,李京.高浓度胶结充填体强度影响因素试验研究[J].煤矿安全,2016,47(3):41-43.
[10]蔡美峰,何满潮,刘东燕,等.岩石力学与工程[M].北京:科学出版社,2013:210-214.