Study on optimization of key parameters of thick hard roof cutting and retaining roadway in inclined coal seam

To address stress concentration in mining roadways, particularly in the inclined, thick, and hard roof, and lessen the impact of sudden overlying strata collapse, a comprehensive study was conducted on the 1301N transport roadway in No.6 Great Wall Mine. The research utilized various methods such as theoretical analysis, numerical simulation, and field monitoring to optimize the key parameters of roof cutting and roadway retaining, leading to improved control of the surrounding rock and reduced risk of impact disturbance. Firstly, based on field geological data, the theoretical minimum roof-cutting height and angle of the 1301N transportation gateway were calculated using the coefficient of rock crushing and swelling and masonry beam theory. Furthermore, in order to confirm and enhance the accuracy of the theoretical findings, we utilized PFC2D numerical software to create a model of the roof-cutting retaining roadway situated in the No.1301N working face. By employing the control variable approach, we studie