In order to study the deformation and failure characteristics of contact zone composite rock mass

the cement

sand and gypsum are used as similar material to make specimens with two different strength materials. By uniaxial compression test

influence of similar material strength and high strength material volume ratio on the mechanical properties of composite specimens is analyzed. The results show that: (1) The larger the strength ratio of the similar material

the greater the impact on the overall strength of the composite specimens; the change of the volume ratio of the higher strength material has a significant impact on the overall strength of the composite specimens. (2) When the similar material strength ratio is 1.74

the rupture plane passes through composite specimen end to similar material contact surface; when it up to 2.49

the rupture plane extends from contact surface to both ends of the composite specimen; when it to 4.33

the composite specimens failure gradually changes from both ends into low strength material end. (3) There is a corresponding relationship between variation of acoustic emission(AE) counts and damage location and shape of composite specimens. With strength ratio of the similar material increasing

AE counts of high strength material end gradually decreased and low strength material end gradually increased. The study provides a theoretical reference for the strength analysis of contact zone composite rock mass.