岩石压剪断裂核的试验研究

本文介绍了岩石压剪断裂试件切口端部微裂区的研究成果。通过白光散斑,光弹贴片测试及切片镜检,查明了该微裂区呈不对称的桑叶状,其内部岩石晶粒碎裂,形成多条裂纹,岩石压剪主破裂面沿微裂区边界面扩展。在上述结果基础上,提出了描述该微裂区的岩石压剪断裂核的形状方程。

EXPERIMENTAL STUDY TO THE COMPRESSION SHEAR FRACTURE NUCLEUS OF ROCK

This paper presents a result of researching the microcracking zone near the notch tip of rock specimen in compression shear fracture. By white light speckles method, photoelastic coating testing and microscopic observation on rock slices, it makes certain that the said microcracking zone is of asymmetric mulberry leaf in shape and the rock grains in the zone are broken so as to form many cracks. In addition, a full field displacement pattern is obtained. The tests also demenstrate that the principal fracture plane of the rock under compression shear state is to propagate along the boundary plane of the microcracking zone. Finally, this paper gives a shape equation of rock compression shear fracture nucleus describing the microcracking zone.