摘要
为探究干湿循环对类岩石力学性能和损伤机制的影响,通过开展不同干湿循环次数下类岩石试样的单轴压缩和声发射试验,系统分析试样的应力-应变关系、弹性模量、单轴抗压强度及声发射参数。结果表明:随着循环次数的增加,试样的抗压强度、弹性模量和声发射累计振铃计数均呈下降趋势;试样的抗压强度与弹性模量的劣化率分别为27.9%和40.1%,弹性模量参数对损伤的敏感性高于抗压强度参数;累计振铃计数随循环次数增加的降幅超60%,可作为试样失稳破坏的前兆特征;声发射b值的骤降现象可作为破裂前兆特征;试样的破坏形式由张拉破坏逐步向剪切破坏转变。研究结果可为干湿交替环境下岩体损伤演化的实时监测提供数据支撑。
To investigate the effects of wet-dry cycles on the mechanical properties and damage mechanisms of rock-like materials,uniaxial compression and acoustic emission tests were conducted on rock-like specimens subjected to different numbers of wet-dry cycles.The stress-strain relationship,elastic modulus,uniaxial compressive strength,and acoustic emission parameters of the specimens were systematically analyzed.The results indicate that as the number of cycles increases,the compressive strength,elastic modulus,and cumulative acoustic emission ring-down counts of the specimens show a declining trend.The degradation rates of compressive strength and elastic modulus were 27.9% and 40.1%,respectively,indicating that the elastic modulus parameter is more sensitive to damage than the compressive strength parameter.The cumulative ring-down counts decreased by over 60% with increasing cycle numbers,which can serve as a precursor characteristic for specimen instability and failure.The sudden drop in the acoustic emission b-value can also be regarded as a precursor to rupture.The failure mode of the specimens gradually transitioned from tensile failure to shear failure.The findings provide data support for real-time monitoring of rock mass damage evolution in wet-dry alternating environments.
作者
卢飞飞
卢小雨
董春亮
连旭
LU Fei-fei;LU Xiao-yu;DONG Chun-liang;LIAN Xu(Anhui University of Science&Technology,School of Civil Engineering&Architecture,Huainan 232001,China;School of Mechanics&Optoelectronic Physics,Anhui University of Science&Technology,Huainan 232001,China)
出处
《河南城建学院学报》
2026年第1期10-15,共6页
Journal of Henan University of Urban Construction
基金
国家自然科学基金项目(52074006)
中国石油科技创新基金项目(2024DQ02-0304)。
关键词
干湿循环
单轴压缩
类岩石
声发射
破坏形态
dry-wet cycles
uniaxial compression
clastic rocks
acoustic emission
failure mode
