Abstract: In order to solve the coal mine engineering problem of the rapid combined excavation in thin seam half-coal rock roadway, aiming at the design and optimization of combined excavation cutting sequence, the numerical model for analyzing the stress evolution of surrounding rock, the shape presentation of shear strain increment and shear strain rate under different excavation sequence has been established by using three-dimensional fast Lagrangian method in this paper. The displacement and rupture range analysis model of different excavation scheme has also been established based on the grey relation theory, and the correlation degree of each scheme has been obtained with the result of 0.63, 0.76, 0.81 and 0.73. Finally an optimal combined excavation cutting scheme has been determined based on the numerical simulation and theoretical calculations, which has been verified by the concrete project. The engineering practices have indicated that the combined excavation cutting sequence of “down-up, right-left” can achieve the optimal combined excavation in half-coal rock roadway. Meanwhile, the monitoring results have also proved its rationality and feasibility.

Key words: half-coal rock roadway, numerical simulation, cutting sequence, gray correlation analysis, scheme optimization