不同压剪应力比作用下节理类岩石材料破坏模式的试验研究

Experiment study on failure style of jointed rock-like material under different compressive-shear stress ratios

通过对含充填节理类岩石材料试件进行变角度压剪试验,探究不同压剪应力比作用下节理倾角对岩体破坏模式的影响。定义削弱度,分析节理倾角对岩体抗剪强度的影响。研究结果表明:不同压剪应力比影响试件的初始破坏模式,最终破坏由过大剪切位移所致,并且节理倾角决定试件破坏后的形态;压剪应力比越大,同角度节理试件的抗剪强度越大;在相同压剪应力比下,与无节理试件抗剪强度相比,节理会削弱试件的抗剪强度,倾角不同,削弱度不同。

In order to study the influence of joint angle on the failure style of joint rock under different compressive-shear stress ratios, a series of compressive-shear experiments were carried out. The weakening degree was defined to analyze the influence of joint angle on the shear strength. The results show that the compressive-shear stress ratios influence the initial failure style and shear displacement and cause the final failure. The joint angle is a key factor of the final failure form. For the same samples, the shear strength grows bigger as the compressive- shear stress ratio grows. Compared to the sample without joint, the joint weakens the shear strength of the sample which contains a joint, and the weakening degree changes with the angle of joint.