论文部分内容阅读
岩石断裂力学用于工程的主要研究内容之一是科学地确定岩石断裂韧度。目前的试验方法基本上是参照测定金属的ASTM-E399和我国YB947-78规程进行的。按此规程测定岩石的断裂韧度存在不少问题。天然岩体不仅有定向的构造裂隙,还含有大量的随机分布微裂纹。在制作试件时,我们可以避开大的裂隙,但无法避开众多的微小隐裂纹。因此,岩石试件本身就是有缺陷的,这一点和金属大不相同;金属材料基本上可视为匀质材料,而岩石则远比它差;金属晶粒是微米级的,岩石的晶粒是毫米级的,两者
One of the main research contents of rock fracture mechanics used in engineering is the scientific determination of rock fracture toughness. Current test methods are basically carried out with reference to ASTM-E399 for metal determination and YB947-78 for China. There are many problems in determining the fracture toughness of rock according to this procedure. The natural rock mass not only has oriented structural fractures, but also contains a large number of randomly distributed micro-cracks. When making specimens, we can avoid large cracks, but we cannot avoid many tiny hidden cracks. Therefore, the rock specimen itself is defective, which is very different from the metal; the metal material can basically be considered as a homogeneous material, and the rock is far worse than it is; the metal grain is micron-sized, the grain of the rock It is mm, both