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含瓦斯煤岩的破坏行为研究,是力学和矿业工程领域的研究热点。文中研究表明:煤体内含有大量的宏观层理和节理,其位置对试样的抗拉强度有影响,因此取自同一地点的煤试样的抗拉强度存在很大差异;胡克定律一直适用。煤变形由煤受力产生的形状和体积的变化以及煤内部裂隙在压应力作用下逐渐闭合所引起的变形组成。煤体受载变形后常保留残余变形值,含瓦斯煤强度越小,其残余变形值越大。通过角模压剪试验可以测定含瓦斯煤体的粘聚力约2.5MPa,内摩擦角约32°。
Research on the destructive behavior of gas-bearing coal and rock is a hot topic in mechanics and mining engineering. The study shows that there are a lot of macroscopic layers and joints in the coal body, and the position of the coal affects the tensile strength of the specimen. Therefore, the tensile strength of coal samples taken from the same place is quite different. Hook’s law has been applied . Coal deformation is caused by the change of the shape and volume of the coal caused by the force and the deformation caused by the gradual closure of the coal internal cracks under the compressive stress. The residual deformation of the coal body is often retained after the deformation of the coal body. The smaller the strength of gas containing coal, the greater the residual deformation value. Through the angle die shear test can determine the cohesion of gas containing coal about 2.5MPa, the internal friction angle of about 32 °.