层理板岩巴西劈裂破坏模式的方向效应研究
发布时间：2019-07-06 21:01
【摘要】：以贵州铜仁市某矿山层理板岩为研究对象,对其微观结构进行观测分析,然后选取7组不同θ角(加载方向与层理法向夹角)试样进行巴西劈裂试验。结果表明:在微观结构上,赤铁矿等刚性颗粒呈基底式胶结于黏土矿物中,层理面为软弱面;板岩的破坏模式存在显著方向效应,抗拉强度随夹角增大而减小;破坏模式总体上可分为4类,θ为0°时是基质拉伸型破坏,基质被逐层劈裂致使试样破坏,抗拉强度最大;θ为15°和30°时为基质拉剪型破坏,主要由于破坏面处的剪应力大于板岩基质的剪切强度致使试样破坏;θ为45°、60°、75°时为层理拉剪型破坏,层理面处的剪应力大于剪切强度时发生破坏;θ为90°时为层理拉伸型破坏,此时完全由于层面受张拉而破坏。
文内图片：
图片说明：图４中４５°下中间试件裂纹并裂纹，，也层理面
[Abstract]:Taking the bedding slate of a mine in Tongren City, Guizhou Province as the research object, the microstructure of the slate was observed and analyzed, and then seven groups of samples with different 胃 angles (the angle between the loading direction and the normal direction of bedding) were selected to carry out Brazil split test. The results show that in the microstructure, the rigid particles such as hematite are cemented in clay minerals in the form of foundation, and the bedding surface is weak, and the failure mode of slate has a significant directional effect, and the tensile strength decreases with the increase of the angle, and the failure mode can be divided into four types as a whole, the matrix is tensile failure when theta is 0 掳, and the tensile strength of the sample is the highest when the matrix is split layer by layer. When theta is 15 掳and 30 掳, it is matrix tensile shear failure, mainly because the shear stress at the failure surface is greater than the shear strength of slate matrix, when theta is 45 掳, 60 掳, 75 掳, it is bedding tensile failure, when theta is 45 掳, 60 掳, 75 掳, the shear stress at the bedding surface is greater than the shear strength, and when the theta is 90 掳, it is the bedding tensile failure, which is completely due to the tension of the plane.
【作者单位】： 武汉理工大学资源与环境工程学院;武汉理工大学图书馆;
【基金】：中央高校基本科研业务费专项资金资助项目(2015ⅣA028)
【分类号】：TU45
本文编号：2511320
文内图片：
图片说明：图４中４５°下中间试件裂纹并裂纹，，也层理面
[Abstract]:Taking the bedding slate of a mine in Tongren City, Guizhou Province as the research object, the microstructure of the slate was observed and analyzed, and then seven groups of samples with different 胃 angles (the angle between the loading direction and the normal direction of bedding) were selected to carry out Brazil split test. The results show that in the microstructure, the rigid particles such as hematite are cemented in clay minerals in the form of foundation, and the bedding surface is weak, and the failure mode of slate has a significant directional effect, and the tensile strength decreases with the increase of the angle, and the failure mode can be divided into four types as a whole, the matrix is tensile failure when theta is 0 掳, and the tensile strength of the sample is the highest when the matrix is split layer by layer. When theta is 15 掳and 30 掳, it is matrix tensile shear failure, mainly because the shear stress at the failure surface is greater than the shear strength of slate matrix, when theta is 45 掳, 60 掳, 75 掳, it is bedding tensile failure, when theta is 45 掳, 60 掳, 75 掳, the shear stress at the bedding surface is greater than the shear strength, and when the theta is 90 掳, it is the bedding tensile failure, which is completely due to the tension of the plane.
【作者单位】： 武汉理工大学资源与环境工程学院;武汉理工大学图书馆;
【基金】：中央高校基本科研业务费专项资金资助项目(2015ⅣA028)
【分类号】：TU45
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