陈文昭,蒋一凡,刘夕奇.循环扰动荷载作用下花岗岩损伤及破裂特性研究[J].南华大学学报(自然科学版),2022,(3):47~53, 88.[CHEN Wenzhao,JIANG Yifan,LIU Xiqi.Damage and Fracture Characteristics of Granite Under Cyclic Disturbance Loading[J].Journal of University of South China(Science and Technology),2022,(3):47~53, 88.]
循环扰动荷载作用下花岗岩损伤及破裂特性研究
Damage and Fracture Characteristics of Granite Under Cyclic Disturbance Loading
投稿时间:2021-12-17  
DOI:
中文关键词:  花岗岩  循环扰动  应力幅值  分形维数  损伤演化〖PS22-03蒋一凡OSID码.tif  Y4*4,Y#〗
英文关键词:granite  cyclic disturbance  stress amplitude  fractal dimension  damage evolution
基金项目:湖南省教育厅重点科研项目(18A252)
作者单位E-mail
陈文昭 南华大学 土木工程学院,湖南 衡阳 421001 cwzusc@126.com 
蒋一凡 南华大学 土木工程学院,湖南 衡阳 421001  
刘夕奇 武汉大学 土木建筑工程学院,湖北 武汉 430000  
摘要点击次数: 329
全文下载次数: 255
中文摘要:
      岩体的稳定性是深部岩、矿开采过程中重需关注的安全问题,而动力扰动是影响岩体稳定性的重要因素。以双江口水电站深部岩石(花岗岩)为研究对象,对花岗岩进行了室内动静组合加载下的单轴压缩试验,并对岩石破坏后的碎屑粒径、分形维数以及岩石加载过程中的损伤演化进行了分析。得到以下结论:1)随着扰动应力幅值的增大,岩石的碎屑分布越趋于均匀;2)岩石在扰动荷载作用下的碎屑粒径分布满足分形规律,可以用分形维数来表征岩石的破碎程度,且分形维数F与扰动幅值Δσ表现出良好的线性关系,即随着扰动幅值增加,分形维数增大,破碎程度加深;3)扰动荷载作用下,损伤变量呈增大-平稳-增大的变化趋势,且扰动幅值Δσ的大小对岩石平稳区段的循环次数和损伤变化速率存在显著影响。
英文摘要:
      The stability of rock mass is a serious safety problem in the process of deep rock and mining, and dynamic disturbance is an important factor affecting the stability of rock mass. The deep rock (granite) of Shuangjiangkou Hydropower Station is taken as the research object. The uniaxial compression test of granite under dynamic and static combined loading is carried out in the laboratory, and the particle size, fractal dimension and damage evolution of the rock are analyzed. The results are as follows:(1) with the increase of the amplitude of disturbance stress, the distribution of rock debris tends to be more uniform. (2) The particle size distribution of rock debris under disturbance load meets the fractal law, and the fractal dimension can be used to characterize the degree of rock fragmentation. The fractal dimension F has a good linear relationship with the disturbance amplitude Δσ, that is, with the increase of disturbance amplitude, the fractal dimension increases and the degree of fragmentation deepens. (3) Under the disturbance load, the damage variable has a trend of increasing-stationary-increasing, and the disturbance amplitude Δσ has a significant influence on the number of cycles and damage change rate of the stationary section of rock.
查看全文  查看/发表评论  下载PDF阅读器
关闭