ABSTRACT
To study the shear deformation behavior, strength, failure form and Acoustic Emission (AE) characteristics of rock joints under the conditions of shear and compression, series of laboratory tests on the artificial regular concrete-made dentate rock joint with teeth height from 0 to 4 mm under Constant Normal Load (CNL) were conducted. The result shows that failure forms of low roughness and high roughness belong to the sliding type and coupled sliding-cutting type, respectively. The shear strength of dentate joint firstly increases and then decreases with the rise of teeth height. In addition, the AE signals in failure process can be roughly divided into short-term active, quiet, rise rapidly and slowly rise period, and the mutation point of AE signals indicates it is more accurate to take AE energy parameters as the premonitory information of shear instability. The variation trends of the shear strength, cumulative AE counts and cumulative energy versus the roughness of joint are similar.
