矸石胶结充填圆柱体损伤破坏尺寸效应研究  

Study on the Size Effect of Damage and Failure of Cylindrical Gangue Cemented Backfill

作　　者：孙昱 张新国[1,2] 卢江丰 范亚奇 焦方树 周以乐 SUN Yu;ZHANG Xinguo;LU Jiangfeng;FAN Yaqi;JIAO Fangshu;ZHOU Yile(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛市266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛市266590

出　　处：《矿业研究与开发》2025年第3期58-65,共8页Mining Research and Development

基　　金：山东省自然科学基金面上项目(ZR202111260144)。

摘　　要：不同尺寸的充填体在力学性能、破坏形式等方面有较大差异,为研究充填体的尺寸效应,选取4组不同尺寸充填体试件进行单轴压缩试验,使用声发射仪监测受载过程能量释放情况,利用数值模拟技术模拟验证试件的压缩破坏,研究不同尺寸圆柱充填体试件尺寸效应及损坏特征。最后,对不同尺寸矸石胶结充填体圆柱体试件进行扫描电镜试验,观察不同尺寸试件微观形貌差距。结果表明:试件的单轴抗压强度与试件尺寸成反比,小尺寸试件以剪切破坏为主,当试件尺寸增大到一定程度时呈现一定的拉伸破坏;随试件尺寸的增大,试件表现出更为明显的尺寸效应,圆柱体试件声发射特征可分为初始准备阶段、声发射递增阶段、声发射递减阶段,小尺寸试件声发射活动相比大尺寸试件更为剧烈;试件尺寸越大,试件内薄弱点越多,试件胶结能力越差。研究结果可为矸石胶结充填中不同尺寸结构的充填体参数确定提供科学依据。There are significant differences in mechanical properties and failure modes among backfill with different sizes.In order to study the size effect of backfill,the uniaxial compression experiments were conducted on four groups of backfill specimens with different sizes,and an acoustic emission meter was used to monitor the energy release during the loading process.Numerical simulation was used to simulate and verify the compression failure of the specimens and study the size effect and damage characteristics of cylindrical backfill specimens with different sizes.Finally,the scanning electron microscope tests were carried out on the cylindrical specimens of gangue cemented backfill with different sizes,and the microscopic morphology difference of different sizes of specimens was observed.The results show that the uniaxial compressive strength of the specimen is inversely proportional to the size of the specimen.The small size specimen is dominated by shear failure.When the size of the specimen increases to a certain extent,it shows a certain tensile failure.With the increase of the size of the specimen,the specimen shows a more obvious size effect.The acoustic emission characteristic of the cylindrical specimen can be divided into the initial preparation stage,the acoustic emission increasing stage and the acoustic emission decreasing stage.The acoustic emission activity of the specimen with small size is more intense than that with the large size.The larger the size of specimen,the more weak points in the specimen,and the worse the cementation ability of the specimen.The research results can provide a scientific basis for the determination of backfill parameters of different size structures in gangue cemented filling.

关 键 词：矸石胶结充填圆柱体 尺寸效应 损伤破坏 抗压强度 声发射特征 

分 类 号：TD713.1[矿业工程—矿井通风与安全]