Influence of Different Propulsion Speeds on the Characteristics of Mine Pressure in the Fully Mechanized Caving Face During Rotary Stage

Abstract

Owing to the influence of advancing speed, the movement characteristics of roof are special, and there exists a risk of pressure frame and roof fall. To understand the influence of the advancing speed on the strata pressure distribution of the fully mechanized top-coal caving roadway during the transition period, this study takes the 301 fully mechanized top-coal caving face of Changchun Xing coal mine as the engineering background. The influence of the advancing speed on the distribution of the abutment pressure is analyzed on the basis of the elastic foundation beam theory, and the characteristics of strata pressure display are verified by both numerical simulation and field measurement. The results show that when the advancing speed of the working face increases, the value of the bearing pressure at the azimuth position in front of the working face also increases. Within a certain range, the peak value of the bearing pressure at the front of the working face is proportional to the advancing speed, and the position of the peak value of the supporting pressure in advance is closer to the working face. The conclusions obtained can provide technical support for stop and end surrounding rock control measures in similar working faces.