Method for determining principal stress direction of coal face

• Main Authors: TANG KUN, ZHOU XIYONG, YANG XIUGUO, ZOU CHAOYANG, DING CHUANHONG, WANG XIUFENG, SHI KUANGMIN, WENG MINGYUE, WU JIANHU
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2024
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; MINING; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention discloses a method for determining the main stress direction of a coal face. The method comprises the following steps: drilling two drill holes in a specific position; wherein the specific positions ensure that the two drill holes are located in the waist line position of the roadway and are a certain distance away from a bottom plate; marking upper, lower, left and right vertexes at the orifice position of each drill hole; respectively measuring the distance between the vertexes of each drill hole in the horizontal direction and the vertical direction at a series of appointed time points, and recording measurement data; for each drill hole, determining drill hole shrinkage based on the measurement data at different time points; and comparing the drill hole shrinkage rates of the two drill holes, and determining the main stress direction of the coal face. Therefore, the main stress direction is deduced by using the difference of the drill hole shrinkage rate, the method is suitable for the under