Early warning technology of roof falling hidden danger in mine roadway based on monitoring and measuring of rock bolt( anchor) support force

In order to take early warning of the roof falling hidden danger in the mine roadway was conducted fron a view of the bolt( anchor) support,based on the site practices,the eary varning nethod of the roo faling hfdten danger in the mine roadway was provided based on the monitoring and measuring of the bolt( anchornsupotfoce. Thebas c eary varning index of bltl anchor) support force and the distinguishing ides system of support abnormal tendency were established.Thus theeary warning devce of the roo ling hiecten danger in the mine rcadwvay was researched and developed.The device was consisted with the bolt( anchor) montioring :eary warning sensor and the montoring eary warning terminal.A muiti easuring point and separation des gn was applied to effectively analyze and handle the early warning index of the rof laling hidcen danger in the mine roadiway .The technology wasappied to the air returning gateway of No.22301coal mining face in Shigeta Mine of Shendong Coal Group for the site application.The application ffect was excellent and the safety of the mine roadway was effectively ensured.