龄期对膏体充填材料力学特性的影响  

Influence of Age on Mechanical Properties of Paste Filling Material

作　　者：王星宇 张新国 李飞帆 WANG Xingyu;ZHANG Xinguo;LI Feifan(College of Mining and Safe Engineering,Shandong University of Science and Technology,Qingdao 266590,Chin)

机构地区：[1]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《煤矿安全》2018年第6期16-19,23,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51574159);山东省自然科学基金资助项目(ZR2014EEM001);中国博士后科学基金资助项目(2015M572068)

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.

关 键 词：充填开采 矸石膏体 力学特性 龄期 回归分析 

分 类 号：TD823.7[矿业工程—煤矿开采]