摘要
针对分级细尾砂胶结充填体长期力学性质不明晰,强度不稳定等问题,通过开展单轴抗压试验、抗剪试验以及电镜扫描试验,从宏细观的角度围绕分级细尾砂胶结充填体长期力学特性及强度演化规律展开研究。结果表明:随着灰砂比增大,胶结充填体试件的单轴抗压强度及剪切强度增大;随着养护龄期的增加,胶结充填体强度降低。养护28 d的不同灰砂比(1∶4, 1∶6, 1∶8, 1∶10)的尾砂胶结体颗粒的平均当量直径依次为1.79μm、1.9μm、2.02μm、2.67μm;养护60 d的不同灰砂比(1∶4, 1∶6, 1∶8, 1∶10)的胶结体颗粒的平均当量直径依次为2.61μm、2.9μm、2.96μm、3.26μm,尾砂胶结体颗粒当量直径与灰砂比呈负相关关系,与养护开龄期呈正相关关系。该研究可为分级细尾砂的现场应用及充填参数的设计提供理论指导。
In view of the problems of unclear long-term mechanical properties and unstable strength of graded fine tailings cemented backfill, the long-term mechanical properties and strength evolution laws of graded fine tailings cemented backfill were studied from the macro and micro perspectives through uniaxial compression tests, shear tests and scanning electron microscope tests. The results are concluded as follows. The uniaxial compressive strength and shear strength of cemented backfill specimens increase with the increase of the cement-sand ratio. With the increase of curing age, the strength of cemented backfill decreases. The average equivalent diameters of tailings cemented particles with different cement-sand ratios(1∶4, 1∶6, 1∶8, 1∶10) cured for 28 days are 1.79 μm, 1.9 μm, 2.02 μm, 2.67 μm in turn. The average equivalent diameters of tailings cemented particles with different cement-sand ratios(1∶4, 1∶6, 1∶8, 1∶10) cured for 60 days are 2.61 μm, 2.9 μm, 2.96 μm, 3.26 μm. The equivalent diameter of tailings cemented particles is negatively correlated with cement-sand ratio, and positively correlated with the curing age. This study can provide a theoretical guidance for the field application of graded fine tailings and the design of filling parameters.
作者
寇云鹏
韩冲冲
齐兆军
谭玉叶
宋卫东
KOU Yunpeng;HAN Chongchong;QI Zhaojun;TAN Yuye;SONG Weidong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Xincheng Gold Mine,Shandong Gold Mining Co.,Ltd.,Yantai,Shandong 264000,China;Key Laboratory of Efficient Mining and Safety of Metal Mines,Ministry of Education,University of Science and Technology Beijing,Beijing100083,China;Luxi Mining Company Lilou Coal Industry,Shandong Energy Group,Heze,Shandong 274700)
出处
《矿业研究与开发》
CAS
北大核心
2023年第2期43-49,共7页
Mining Research and Development
基金
国家自然科学基金项目(52004019)。
关键词
分级细尾砂
充填体强度
剪切强度
颗粒分布
平均当量直径
Graded fine tailings
Backfill strength
Shear strength
Particle distribution
Average equivalent diameter
