摘要
为研究胶凝砂砾石材料的细观损伤破坏机理,开展了单轴压缩声发射试验,从声发射参数角度出发揭示了其损伤演化规律,建立了加载全过程的非线性损伤演化模型。结果表明,胶凝砂砾石材料在整个加载过程中表现为压密、弹性、塑性、峰后破坏4个阶段,整体破坏以剪切破坏为主;加载过程中声发射振铃计数呈上升-活跃-平静的变化趋势,累积振铃计数与损伤变量随时间呈“S”形分布。以声发射特征参数构建的损伤演化模型能够反映材料受载全阶段损伤演化过程及损伤累积程度,为胶凝砂砾石坝结构分析奠定了理论基础。
In order to study the mesoscopic damage and failure mechanism of cemented sand gravel(CSG)materials,the acoustic emission tests under uniaxial compression have been carried out to reveal the damage evolution law,and a nonlinear damage evolution model has been established for the whole loading process.The results show that there are four stages of compaction,elasticity,plasticity and post-peak failure in the whole loading process,and the overall failure is mainly shear failure;During the loading process,the acoustic emission ringing count showed a trend of rising,active and quiet,and the cumulative ringing count and damage variables showed an"S"shape distribution with the increase of time.The damage evolution model constructed with acoustic emission characteristic parameter can reflect the whole stage damage evolution process of CSG materials,and can quantify the damage accumulation degree in the whole process of deformation and failure.The research results lay a theoretical foundation for the analysis of damage evolution process of CSG materials dam.
作者
宋绍华
张献才
张剑翔
王玉强
郭利霞
SONG Shao-hua;ZHANG Xian-cai;ZHANG Jian-xiang;WANG Yu-qiang;GUO Li-xia(Linzhou Water Resources Affairs Center,Linzhou 456500,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Linzhou City Investment Group Co.,Ltd,Linzhou 456500,China)
出处
《水电能源科学》
北大核心
2025年第4期124-128,共5页
Water Resources and Power
基金
国家自然科学基金项目(52109154)
河南省科技攻关项目(192102310224)。
关键词
胶凝砂砾石
损伤演化
声发射特征
损伤模型
cemented sand gravel
damage evolution
acoustic emission properties
damage model
