循环载荷下饱和砂岩的滞弹性衰减与损伤研究  

Anelastic attenuation and damage of saturated sandstone under cyclic loading

作　　者：席军[1] 宛新林 席道瑛[3,4] XI Jun;WAN Xinlin;XI Daoying(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing102617,China;Civil Engineering College,Anhui Jianzhu University,Hefei,Anhui 230023,China;Mengcheng Geophysical National Field Station,University of Science and Technology of China,Hefei,Anhui 230026,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei,Anhui 230026,China)

机构地区：[1]北京石油化工学院机械工程学院,北京102617 [2]安徽建筑大学土木工程学院,安徽合肥230023 [3]中国科学技术大学蒙城地球物理国家野外观测站,安徽合肥230026 [4]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《岩石力学与工程学报》2023年第5期1214-1224,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41804060)。

摘　　要：为研究饱和砂岩在弹性范围内的滞弹性衰减与损伤的关系,在0.01~1 000 Hz频率范围和-60℃~190℃温度范围内开展受迫共振和单轴循环加载实验。实验结果显示岩石的响应曲线出现弛豫衰减峰,岩石中频散效应随温度和频率的升高愈发明显。研究表明:应力诱导下岩石内部的微损伤产生运动并相互作用;振动频率的提高促进岩石微裂纹增长;温升和激活能偏小助力微裂纹的萌生和扩展;循环应力也会在岩石内部微观结构不均匀处产生新的疲劳微损伤。虽然导致岩石品质下降的滞弹性微损伤发生在弹性范围内,但在动态和高频载荷作用下其累积效应会加速发展,值得关注。To investigate the relationship between anelastic attenuation and damage of saturated sandstone in the elastic range,the forced resonance and uniaxial cyclic loading experiments were carried out in the frequency range of 0.01-1000 Hz and the temperature range of−60℃-190℃.The experimental results show that the response curve of the rock exhibits a relaxation attenuation peak,and the dispersion effect in the rock becomes more apparent with the increase of temperature and frequency.The research results indicate that stress induces micro damage movement and interaction within rocks.The increase in vibration frequency promotes the growth of rock microcracks.The rise of temperature and small activation energy contribute to the initiation and propagation of microcracks.Cyclic stress also generates new fatigue micro damage in the uneven microstructure inside the rock.Although the anelastic micro damage that decreases the rock quality occurs within the elastic range,its cumulative effect will accelerate development under dynamic and high-frequency loads,which is worthy of concern.

关 键 词：岩石力学 饱和砂岩 弛豫衰减峰 滞弹性损伤 弹性模量亏损 频率和温度效应 

分 类 号：TU45[建筑科学—岩土工程]