含瓦斯煤的基本力学性质试验研究

Study of Basic Mechanical Properties for Gassy Coal

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°。

The research on destruction of gaseous coal is a hot spot in the fields of mechanics and mining engineering. It shows that a large amount of macroscopic beddings and joints were contained in gassy coal, the positions of which have influence on tensile strength. So the tensile strength of gassy coal which was fed from the same place has great difference. Hoek law in gassy coal compression strength was satis- fied till collapsing pressure. The deformation of gassy coal under compression stress is composed of two parts, one of which is the change of shape and volume of gassy coal under pressure, the other of which is the deformation caused by the gradually closed internal failure under the compression stress. Residual deformation always exists when gassy coal was loaded, and the litter the strength of gassy coal was, the larger residual deformation was. The cohesion of gassy coal tested is about 2.5MPa, and internal friction angle is approximately 32°.