摘要
岩石颗粒粒径及胶结物是影响岩石力学性质和行为的重要因素。天然岩石的内部颗粒粒径大小及胶结物含量随机性强,为此制作了3种不同颗粒粒径及3种不同胶结物含量的人工砂岩,研究了颗粒粒径大小及胶结物含量对岩石力学特征及声发射行为的影响。研究表明:相同胶结物含量条件下,粗粒径(0.425~0.850 mm)人工砂岩试件的声波波速和单轴抗压强度最大;随着颗粒粒径的增大,试件裂纹扩展阶段缩短,在试样峰值强度点附近的声发射能和事件数呈增加趋势;相同颗粒粒径条件下,随着胶结物含量的增加,试件的单轴抗压强度降低,峰值强度点附近的声发射事件数也减少,声发射关联维数D的最低值所对应的应力百分比值下降。声发射关联维数D值与强度呈线性关系。
Rock particle size and its cement are important factors affecting the mechanical properties and behavior of rock.Due to the strong randomness of the crystal particle size and cement content in natural rocks,artificial sandstones with three different particle sizes and three different cement contents were prepared,and the effects of crystal particle size and cement content on the mechanical properties and acoustic emission behaviors were emphatically studied.The results show that the wave velocity and uniaxial compressive strength of artificial sandstone specimens with coarse particle size(0.425-0.85 mm)are the highest under the same cement content.With the increase of particle size,the crack propagation stage of the specimen decreases gradually,and the acoustic emission energy rate and event rate near the peak strength point of the specimen increase.Under the same particle size condition,with the increase of cement content,the uniaxial compressive strength of the specimen decreases gradually,the acoustic emission event rate near the peak strength point decreases gradually,and the stress percentage value corresponding to the fractal dimension D value of acoustic emission amplitude decreases to the lowest value gradually.The fractal dimension D of acoustic emission amplitude has a linear relationship with the strength.
作者
赵奎
王金鉴
曾鹏
杨道学
梁楠
龚囱
ZHAO Kui;WANG Jinjian;ZENG Peng;YANG Daoxue;LIANG Nan;GONG Cong(College of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Key Laboratory of Mining Engineering of Jiangxi Province,Ganzhou,Jiangxi 341000,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第1期141-146,共6页
Mining Research and Development
基金
国家自然科学基金项目(51664018,52164004,52104086)
江西省重点研发计划重点项目(20212BBG71009)
江西省博士后科研项目(2020KY39)。
关键词
人工砂岩
颗粒粒径
单轴压缩
声发射
抗压强度
Artificial sandstone
Particle size
Uniaxial compressive
Acoustic emission
Compressive strength
