超声波法评价矸石膏体的静态抗离析性能  

Assessing static stability of cemented coal gangue backfill with ultrasonic pulse velocity method

作　　者：冯国瑞[1] 李庆东 戚庭野[1] 郭育霞[1] 冉洪宇 郝晨良 FENG Guorui;LI Qingdong;QI Tingye;GUO Yuxia;RAN Hongyu;HAO Chenliang(College of Mining Engineering,Research Center of Green Mining Engineering Technology in Shanxi Province,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西省绿色采矿工程技术研究中心,山西太原030024

出　　处：《采矿与安全工程学报》2020年第6期1231-1237,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51925402,U1710258);山西省重点研发计划项目(社会发展领域)(201803D31044);山西省高等学校优秀创新团队项目。

摘　　要：为了快速评价矸石膏体充填材料的静态抗离析性能,使用康科瑞NM-4B非金属超声波检测仪研究了超声波在充填料浆和硬化充填体中的传播特征。试验结果表明:静置10 min以后,超声波在充填料浆中的传播速度趋于稳定,超声波在试模顶部料浆中的传播速度明显小于试模底部料浆中的传播速度;依据超声波在试模顶部料浆中的传播速度和试模底部料浆中的传播速度计算得到静态离析率,与静态离析指数之间的相关系数为0.995;随养护龄期增长,超声波在硬化充填体中的传播速度逐渐增大,超声波在硬化充填体顶部、中部和底部的传播速度存在显著差异,定义超声波在充填体高度方向不同位置处传播速度的标准差为硬化静态离析率,硬化静态离析率与静态离析率之间的相关系数为0.941,与静态离析指数之间的相关系数为0.955。因此,静态离析率和硬化静态离析率可以用来表征矸石膏体的静态抗离析性能。To assess the static stability of cemented coal gangue backfill(CGB)efficiently,ultrasonic pulse velocity(UPV)in fresh slurry and hardened backfill body has been studied.The results have shown that UPV in fresh slurry tends to be stable after 10 mins and UPV in the top section of ultrasonic mold is much greater than UPV in the bottom section of the mold.The static segregation rate has been calculated based on UPV aforementioned and the correlation coefficient between segregation index(SI)and segregation rate(SR)reaches 0.995.UPV in hardened backfill body increases over curing time and UPV in backfill body changes with the increase of the curing age.UPV in the top,middle,and bottom of hardened backfill varies significantly.Standard deviation is calculated to quantify the amount of variation of UPV in different positions of the hardened backfilling body,which is defined as HSR of CGB.HSR highly correlates with SR and SI with correlation coefficient 0.941 and 0.955 respectively.Therefore,SR and HSR can reflect the static stability of CGB with great accurateness.

关 键 词：矸石膏体 静态抗离析性能 超声波 静态离析率 硬化静态离析率 

分 类 号：TD353[矿业工程—矿井建设]