关键词: 测力锚杆, 锚杆支护, 传感器, 监测预警

Abstract: In view of the coal mine production safety background of frequent roof accidents, the principle of force-measuring bolt is analyzed, and a distributed real-time monitoring force-measuring bolt system is constructed, including distributed force-measuring bolt, real-time acquisition substation, intelligent gateway and dynamic intelligent early warning platform. The working conditions such as axial force and bending moment of the bolt can be dynamically and real-time monitored. When the axial force of the bolt exceeds the safety threshold, the system will accurately issue safety warning. The working principle, preparation process and calibration method of distributed force measuring bolt are given. The distributed real-time monitoring force-measuring bolt was successfully applied in the transportation roadway of 21105 working face in Lushun, 1126 ( 1 ), Guqiao Coal Mine, Huainan, and Gaoyang Coal Mine, Fenxi, Shanxi. Based on the monitoring results, the evolution laws of axial force and bending moment of the bolt were analyzed, the response relationship between axial force and periodic weighting of the stope was predicted, and the working condition response law of the bolt during the mining of the roadway was revealed. In the force-measuring section, the ‘ original rock stress zone, mining influence zone, and severe influence zone ’ were divided, which provided data support and guarantee for the bolt support design optimization and roof safety of the roadway.