高温灰岩单轴压缩力学特征与微观解析  

Mechanical Characteristics and Microscopic Analysis of Uniaxial Compression of Limestone Under High-Temperature Treatment Conditions

作　　者：黄锋[1,2] 刘星辰 周洋[1,2] 郑艾辰 杨冬 Huang Feng;Liu Xingchen;Zhou Yang;Zheng Aichen;Yang Dong(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China;School of Civil Engineering,Chongqing Vocational Institute of Engineering,Chongqing 400074,P.R.China)

机构地区：[1]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]重庆工程职业技术学院土木工程学院,重庆402260

出　　处：《地下空间与工程学报》2025年第1期70-77,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金面上项目(52078090);重庆交通大学研究生科研创新项目(2023S0006);重庆市教育委员科学技术研究项目(KJQN202403431);中国电力建设股份有限公司科技项目(DJ-HXGG-2023-04)。

摘　　要：为研究高温处理后灰岩单轴压缩力学特征,对常温(25℃)与经历高温(100℃、200℃、300℃、400℃、500℃和600℃)处理后的灰岩开展了物理特征测试、单轴压缩试验、SEM电镜扫描与XRD衍射分析,基于岩石微观裂损规律解析了灰岩单轴压缩力学特征。结果表明:随着处理温度升高,灰岩表观颜色由青灰色演变为红褐色,体积增长率、质量损失率呈非线性增大;高温处理使灰岩微观质地分层、裂隙发育、孔洞溶蚀,受压破裂断口面起伏与尖角特征显著;高温催化了灰岩矿物组分的热解与化合反应,岩石综合硬度系数与坚固性系数存在显著线性相关性;揭示灰岩热损伤的阈值温度为200℃,峰值强度与弹性模量均在此温度下达到峰值。In order to study the uniaxial compression mechanical characteristics of limestone under high temperature treatment,the physical characteristics test,uniaxial compression test,SEM electron microscope scanning and XRD diffraction analysis were carried out on limestone treated at room temperature(25℃)and high temperature(100℃,200℃,300℃,400℃,500℃and 600℃).Based on the micro-fracture law of rock,the mechanical characteristics of limestone under uniaxial compression were analyzed.The results show that with the increase of treatment temperature,the apparent color of limestone changes from gray to reddish brown,and the volume growth rate and mass loss rate increase nonlinearly.High temperature treatment makes limestone micro-texture stratification,fracture development,pore dissolution,and the fluctuation and sharp angle characteristics of compression fracture surface are significant.High temperature catalyzes the pyrolysis and chemical reaction of limestone mineral components,and there is a significant linear correlation between the comprehensive hardness coefficient and the firmness coefficient of rock.It is revealed that the threshold temperature of thermal damage of limestone is 200℃,and the peak strength and elastic modulus reach the peak at this temperature.

关 键 词：高温处理 灰岩 力学特征 微观裂损 硬度系数 

分 类 号：TU458[建筑科学—岩土工程]