Meso-structure and fracture mechanism of mudstone at high temperature

查看全文 作　　者：Zhang [1,2]Lianying;Mao [3,4]Xianbiao;Liu [1,2]Ruixueab;Li [1]Yan;Yin [1]Huiguang

机构地区：[1]Civil Engineering Department, Xuzhou Institute of Technology;[2]State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining & Technology;[3]State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology;[4]School of Mechanics & Civil Engineering, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》索引2014年第24卷第4期,共7页

基　　金：financial support from the National Natural Science Foundation of China(Nos.51074166,51104128,51322401 and 51204159);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20120095110013);the Science and Technology Projects of Urban and Rural Housing Ministry of Construction of China(No.2011-k3-5);the‘‘Blue Project’’of Jiangsu Province are greatly appreciated 摘　　要：The meso-structure mineral composition and fracture mechanism of uniaxial compressed mudstone samples at high temperature were analyzed by XRD and scanning electron microscopy. The effect of temperature on mudstone composition and fracture mechanism were studied from a meso-structural perspective, and the relationship between meso-structure and macro-mechanical characteristics at high temperature was revealed. The findings demonstrated that the fluctuation in diffraction intensity of kaolinite in the mudstone caused the fluctuation in its mechanical properties. The overall structure underwent a phase change around 600 ℃, which led to the sudden change in the mechanical properties of mudstone samples. When the temperature reached 600 ℃, the crystalline state worsened and kaolinite disappeared; however, some illite was produced, indicating that the chemical reaction of the structure and sudden drop of bearing capacity of the mudstone. Mudstone fracturing at high temperature involves mainly intergranular and transgranular fractures, which are typical in micro-brittle tensile failure. Considering the macro-fracture characteristics of mudstone, the results suggested that macro-fracture under external force corresponds to the meso-fracture. 关键词：断裂机理细观结构泥岩高温 X射线衍射强度扫描电子显微镜分析内消旋结构机械性能

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Meso-structure and fracture mechanism of mudstone at high temperature

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