Abstract: It is not easy to process rock with natural structural plane to form rock test pieces of all angles,in order to study whether the pre fabricated weak test pieces can replace the experimental results with natural weak test pieces,comparison between the results of uniaxial compression test with pre fabricated weak plane based on acoustic emission monitoring and that with natural weak specimen.The results show that:①According to the stressstrain analysis,the mechanical properties of the sample with prefabricated structure and the sample with natural structure are basically the same,and the strength of the sample with structure is in order:The sample with longitudinal structure,the sample with transverse structure,the sample with inclined structure and the sample with inclined triangle structure;②Through the failure mode analysis,the failure modes of the specimens with prefabricated structure and natural structure are roughly the same,and the failure modes of the specimens with the same angle are roughly the same;③The acoustic emission signal of the test piece with prefabricated weak plane is basically similar to that of the test piece with natural weak plane;the impact rate and energy accumulation trend of acoustic emission are basically the same;④Through the comparison of the prefabricated weak plane and the natural weak specimen,the mechanical properties,failure mode and acoustic emission signal change trend are basically the same,which can simulate the anisotropy of natural weak plane by prefabricating weak plane.

Key words: prefabricated structural plane,natural structural plane,mechanical properties,acoustic emission