Evolution of static fracture mechanics and energy dissipation characteristics of composites based on different interface angles.

This study aims to investigate the mechanical properties and energy characteristics of coal-rock combinations during uniaxial compression, specifically focusing on variations in interface inclination angles. Each of the stress-strain curves of the CRC (Coal-Rock-Like Material Combination) with varying interface inclination angles were obtained using the DYD-10 universal testing machine and a high-definition camera system. Subsequently, the energy of the CRC was calculated using a specific formula. The experimental results demonstrated that when the interface inclination angles increased, the compressive strength and elastic modulus of the CRC showed a monotonous decreasing trend. The storage of elastic energy mainly occurred in the elastic stage and the plastic fracture stage, and the growth of dissipated energy increases obviously in the post-peak failure stage. As the inclination angles of the interface experience a rise, the energy storage limit (ESL) of the specimen decreases obviously, the CRC was more prone to fracture as the rate of dissipated energy conversion gradually increased. In order to understand the process of coal and rock mass disasters and prevent coal and gas outbursts, the mechanical features and fracture energy characteristics of the CRC under various interface dip angles were examined in this article.