摘要
以晋华宫煤矿某巷道顶板砂岩为研究对象,利用MTS815.03型岩石材料试验机对试样进行单轴压缩试验。分析和研究了砂岩在单向抗压荷载作用下的变形特性和破坏模式,得到以下结论:1岩石试样在单向压缩条件下的破坏模式主要有劈裂模式、剪(主)+拉(次)模式、劈+剪共存等三种模式。具体表现为单裂纹劈裂贯通、多裂纹劈裂贯通以及剪切破坏等;2根据能量耗散理论,提出了单向压缩条件下试样破坏模式与耗散能之间的关系,认为试样破裂模式与试样破裂前后的能量指标关系不大,而与试样破裂前后的耗散能比值有直接的关系,比值越小,试样破裂的块体越小,比值越大,试样破裂的块体越大。
With roof sandstone of one mine funnel of Jinhuagong coal mine as the study object, MTS815.03 type rock material test machine is used to carry out the uniaxial compression test of test specimens. This paper analyzes and studies deformation characteristics and destruction mode of sandstone specimens under the condition of uniaxial compression so as to obtain the following conclusions： （1） the main failure modes of the rock specimens are splitting failure, splitting shear joint damage, and single shear failure modes under the condition of uniaxial compression. The Specific performances show that a single crack splitting through, multiple cracks splitting through and shear failure mode. （2） According to the energy dissipation theory, the new conclusion points out the relationship between failure modes and energy dissipation under uniaxial compression conditions. It is considered that there is no relation between the energy index and the sample failure mode before and after the sample is broken. But it has a direct relationship with the sample failure mode to the ratio of the dissipation of energy before and after the sample is broken. The smaller the ratio is, the smaller the sample ruptured block is, the larger the ratio is, the larger sample ruptured block is.
出处
《西安理工大学学报》
CAS
北大核心
2014年第3期309-314,共6页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51374045
51274051)
辽宁省教育厅基金资助项目(L2012450)
大连大学博士专项基金资助项目(08-6)
关键词
岩石力学
单轴压缩试验
能量耗散理论
破坏模式
rock mechanics
uniaxial compression test
energy dissipation theory
failure mode
