摘要
为探究正交裂隙对岩石力学特性及裂纹扩展的影响规律,利用类岩石材料制成不同裂隙倾角的预制正交裂隙试件进行单轴压缩试验,同时借助应变仪对裂隙端部局部应变进行监测.研究结果表明:裂隙倾角是影响试件峰值强度的主要因素;峰值强度随着裂隙倾角的增大呈先减小后增大的变化规律,当裂隙倾角α=45°时,试件的力学指标达到最小值;正交裂隙试件的主裂隙或次裂隙端部更容易发生起裂,起裂顺序及裂纹发展方式与裂隙倾角有关,主要呈翼型发展.
In order to explore the influence of orthogonal cracks on rock mechanical properties and crack growth,rock-like materials are used to make prefabricated orthogonal crack specimens with different crack inclination angles for uniaxial compression test,at the same time,the local strain at the end of the crack is monitored with the aid of a strain gauge.The research results show that the inclination angle of the crack is the main factor affecting the rock strength.The rock strength first decreases and then increases with the increase of the crack inclination angle.Whenα=45°,the mechanical index of the specimen reaches the minimum.The end of the main crack or the secondary crack in the orthogonal crack specimen is more prone to cracking,the crack initiation sequence and crack development mode are related to the crack inclination,mainly developed as an airfoil.
作者
卢振兴
万文
LU Zhenxing;WAN Wen(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《矿业工程研究》
2023年第2期23-28,共6页
Mineral Engineering Research
基金
国家自然科学基金资助项目(51774132)。
关键词
类岩石材料
正交裂隙
单轴压缩
裂纹扩展
rock-like materials
orthogonally cracks
uniaxial compression
crack growth
