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陈文昭,常睿,刘夕奇,綦春明.基于RA-AF的热损伤玄武岩岩爆倾向性及破裂特征研究[J].南华大学学报(自然科学版),2024,(5):58~67.[CHEN Wenzhao,CHANG Rui,LIU Xiqi,QI Chunming.Study on Rockburst Tendency and Fracture Characteristics of Thermal Damage Basalt Based on RA-AF[J].Journal of University of South China(Science and Technology),2024,(5):58~67.]

基于RA-AF的热损伤玄武岩岩爆倾向性及破裂特征研究

Study on Rockburst Tendency and Fracture Characteristics of Thermal Damage Basalt Based on RA-AF

投稿时间：2024-03-14

DOI：

中文关键词: 高温玄武岩力学特性声发射岩爆倾向性破裂特征

英文关键词:high temperature basalt mechanical properties acoustic emission rockburst proneness fracture characteristics

基金项目:湖南省研究生科研创新计划项目(QL20220216);湖南省自然科学基金资助项目(2023JJ3051);湖南省自然资源厅科技项目(20230144DZ);湖南省教育厅项目(重点)(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	chengwz@usc.edu.cn
常睿	南华大学土木工程学院,湖南衡阳 421001
刘夕奇	珠江水利委员会珠江水利科学研究院,广东广州 510611
綦春明	南华大学土木工程学院,湖南衡阳 421001

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中文摘要:

为了揭示高温影响下玄武岩的岩爆机制,开展了高温作用下玄武岩单轴压缩试验及声发射监测,研究了不同温度作用后玄武岩的力学特性、声发射特性、岩爆倾向性及破裂特征。探究发现:温度的上升对玄武岩的力学性质、声发射特性及岩爆倾向性产生了显著影响;随着温度的增高,玄武岩的单轴抗压强度、弹性模量和岩爆倾向性先是升高然后下降,温度达到200 ℃时达到转折点;在单轴压缩试验中,玄武岩主要表现出拉张型裂纹,而当施加的应力超出峰值应力的80%后,剪切型裂纹增多;超过600 ℃后,剪切裂纹比例开始增加,而超过800 ℃时,剪切裂纹比例突然下降,因此600 ℃与800 ℃是玄武岩损伤性质转变的关键温度点;与此同时,RA值和AF值两个指标有效识别了玄武岩损坏过程中不同裂纹类型的分布情况。

英文摘要:

In order to reveal the rock burst mechanism of basalt under the influence of high temperature, the uniaxial compression test and acoustic emission monitoring of basalt under high temperature were carried out. The mechanical properties, acoustic emission characteristics, rock burst tendency and fracture characteristics of basalt under different temperatures were studied. It is found that the increase of temperature has a significant effect on the mechanical properties, acoustic emission characteristics and rockburst tendency of basalt. With the increase of temperature, the uniaxial compressive strength, elastic modulus and rockburst tendency of basalt increase first and then decrease, and reach the turning point when the temperature reaches 200 ℃. In the uniaxial compression test, basalt mainly shows tensile cracks, and when the applied stress exceeds 80% of the peak stress, the shear cracks increase. When the temperature exceeds 600 ℃, the proportion of shear cracks begins to increase, and when the temperature exceeds 800 ℃, the proportion of shear cracks suddenly decreases. Therefore, 600 ℃ and 800 ℃ are the key temperature points for the transformation of basalt damage properties. At the same time, the two indexes of RA value and AF value effectively identify the distribution of different crack types in the process of basalt damage.

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