摘要
为研究注水对煤层破坏特性的影响,开展煤样单轴压缩试验,观察不同含水率预制裂纹型煤试件的能耗及破坏模式。结果表明:随着含水率的增加,煤样单轴抗压强度和弹性模量均以负指数函数方式下降;煤样积聚的总能量、存储的弹性能和破坏的耗散能均随含水率以二次抛物线递减函数方式减小;煤样中预制裂纹产生起裂点所需轴向应力和峰值应力随含水率逐渐减小;试样破坏形式随含水率由单一剪切破坏发展到拉伸破坏,然后剪切拉伸复合型破坏。
In order to investigate the influence of water injection on destruction of coal seam,uniaxial compression experiments were carried out on coal samples. Effects of water content on the energy consumption and destruction form of prefabricated cracks in coal samples were studied. The test result indicates that there is a negative exponential correlation between both the uniaxial compressive strength and elastic modulus and the water content,It is also found that the relationships between the total energy accumulation,stored elastic energy,and dissipated energy of destruction of coal sample and the water content take on the form of decreasing quadratic parabola function,that there is a negative correlation between both the axial stress and peak stress required initiate crack during prefabrication and the peak stress and the water content,and that the destruction form of the sample is a function of the water content.
作者
康向涛
刘勇
江成玉
宋真龙
高林
KANG Xiangtao LIU Yong JIANG Chengyu SONG Zhenlong GAO Lin(Mining College, Guizhou University, Guiyang Guizhou 550025, China State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第7期94-98,共5页
China Safety Science Journal
基金
贵州大学引进人才科研项目(贵大人基合字(2015)15)
关键词
含水率
预制裂纹
煤样
能量积聚
能量耗散
破坏模式
water content
prefabricated crack
coal samples
energy accumulation
energy dissipation
destruction form
