三维静载作用下含层理煤动态力学特性研究  

Study on the Dynamic Mechanical Properties of Layered Coal Under Three-dimensional Static Loading

作　　者：陶瑞律 薛生 李炜煜 李光明 TAO Ruilü;XUE Sheng;LI Weiyu;LI Guangming(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China;National Local Joint Engineering Research Center for Precision Mining of Coal Safety,Anhui University of Science and Technology,Huainan Anhui 232001,China;Shandong Cicoside Mining Safety Engineering Co,Ltd,Taian Shandong 271000,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001 [2]安徽理工大学煤炭安全精准开采国家地方联合工程研究中心,安徽淮南232001 [3]山东思科赛德矿业安全工程有限公司,山东泰安271000

出　　处：《安全》2024年第12期73-81,共9页Safety & Security

基　　金：煤炭安全精准开采国家地方联合工程研究中心基金项目(EC2021018);国家自然科学基金重点项目(51934007);国家自然科学基金(52304116)。

摘　　要：为研究不同三维应力(轴压2.70 MPa,围压5.04 MPa;轴压13.50 MPa,围压12.60 MPa)条件下含层理煤样(0°、45°、90°)的动态力学行为,采用改进后主动三轴的分离式霍普金森压杆(SHPB)实验系统,对含层理煤样进行动态三轴冲击实验研究;分析三维应力作用下不同层理角度对煤样动态力学特性及其能量耗散规律的影响。研究表明:随着三维应力的增加,煤样的动态抗压强度与动态弹性模量增高,煤样的能量吸收率和能量耗散密度呈正相关;随着层理角度的增大,煤样的动态抗压强度、弹性模量均呈现先降低后升高的∨形分布,在层理角为45°时均为最小值;能量吸收率与能量耗散密度呈现先增大后减小的∧形分布,在层理角为45°时达到最大值。实验得出的力学特性与能量耗散规律可为煤炭安全高效开采提供理论支持。To investigate the dynamic mechanical behavior of layered coal samples(0°,45°,90°)under different three-dimensional stress(axial pressure of 2.70 MPa and confining pressure of 5.04 MPa;axial pressure of 13.50 MPa and confining pressure of 12.60 MPa),an improved active triaxial Split-Hopkinson Pressure Bar(SHPB)experimental system was used to conduct dynamic triaxial impact experiments of layered coal samples.The effects of different bedding angle on the dynamic mechanical properties and energy dissipation characteristics of coal sample were analyzed under three-dimensional stress.The results indicate that with the increase of three-dimensional stress,the dynamic compressive strength and dynamic elastic modulus of the coal sample increase,and the energy absorption rate of coal sample is positively correlated with the energy dissipation density.With the increase of bedding angle,both the dynamic compressive strength and elastic modulus of the coal samples exhibit a V-shaped distribution that decrease first and then increase,and both are the minimum value when the bedding angle is 45°.In contrast,the energy absorption rate and energy dissipation density increase first and then decrease in an inverted V-shaped distribution,reaching the maximum value when the bedding angle is 45°.The mechanical properties and energy dissipation rules obtained from the experiments can provide theoretical support for the safe and efficient extraction of coal.

关 键 词：含层理煤样 分离式霍普金森压杆(SHPB) 动态三轴压缩实验 能量耗散 

分 类 号：X913[环境科学与工程—安全科学]