Damage and Acoustic Emission Characteristics of Combined Rock Mass with Anchor Under Different Inclination Angles and Combination Modes

Soft and hard rock assemblages and anchor solids have important effects on rock mechanics properties under different inclinations and assemblages, so it is of great significance to study their damage and acoustic emission. Numerical simulation software RFPA(2D) was used to analyze the damage and acoustic emission characteristics of soft and hard rocks under different inclinations and combinations under uniaxial compression. The results show that :(1) with the increase of contact dip Angle, the rock mass strength and peak strain decrease first and then increase; (2) The mechanical properties of the composite rock mass are affected by the contact dip Angle. With the increase of the strength of the upper hard rock, the strength and peak strain tend to decrease and then increase, and the critical contact dip Angle is 75 degrees. (3) When the contact Angle of the composite rock mass is 0 similar to 60 degrees, the greater the contact Angle of the composite rock mass is, the more obvious the effect of the bolt on improving the mechanical properties of the rock mass is. The research results have certain reference significance to the damage and prevention of the soft and hard combined anchor solid.