Failure Characteristics and Stability Control Technology of Dynamic Pressure Roadway Affected by the Mining Activity: A Case Study

Abstract Dynamic pressure roadway affected by the mining activity (DPRAMA), which is aimed at promoting the efficiency of panel replacement, is a new mode of roadway arrangement in neighboring panels. However, the failure characteristics and stability control of DPRAMA surrounding rock are rarely reported. In this study, the fragment grade of two-side coal mass of DPRAMA in Gaojiapu Coal Mine was evaluated using the basic measurement scale-fragment grade evaluation method. Then, the evolution of rock mass failure was analyzed through Flac3D software. The results show that (1) under static loading, DPRAMA is highly stable. (2) Under the second dynamic loading, the stress concentration coefficient and deformation value of surrounding rock both surges. (3) Under dynamic-static loadings, the roof falling value is far larger than the floor heave value, and the deformation of pillar-side coal mass is more serious than that of panel-side coal mass. Surrounding rock deformation is divided into three phases, and the specific support strategy is selected in accordance with the characteristics of each stage. (4) The plastic region shows a tendency of butterfly-shaped failure. Based on these findings, the surrounding rock control strategy of “slow yield and long-short control” was proposed to alleviate roof and pillar-side coal mass deformation. Furthermore, the coupling support scheme of “high-strength yield bolt (cable) & steel band” was designed for DPRAMA.