Research On The Security Of High Voltage Transmission Line Towers Under Mining Influence

Based on the project of high voltage transmission line at Jinlong Coal Mine, the security of high voltage transmission towers under mining influence were studied systematically by combining the methods of probability integral model, the finite element simulation, theoretical analysis and field observation.First of all, on the basis of analyzing the parameters of the surface movement and deformation in this area, the effects of high voltage line towers were predicted and analyzed after excavation of No.21081 working face by the probability integral model,the result indicated that surface slope and surface horizontal strain may be main factors of surface movement and deformation to affect the stability of high voltage towers. Next, according to the No.2 high voltage line tower,numerical model was set up to study damage characters of high voltage tower under the influence of different surface deformation. The relationship between the internal forces and deformation of the high voltage tower and the main surface deformation was analyzed, and safety critical deformation value for high voltage tower was obtained. the safety of No.2 high voltage tower after excavation of No.21081 working face was preliminary analyzed by applying research results. Meanwhile, the deformation of high voltage lines was predicted by theoretical analysis method, and its safety was estimated based on the transmission line running standard, the result showed the circuit elements are able to meet the overhead transmission lines running standard requirements, except for high voltage tower tilt overrun. Finally, according to the influence degree of transmission lines and towers after No.21081 working face was undermined, protection measures were proposed for mining under high voltage transmission tower. The study provides an important base for the safe mining of protective coal pillars of high voltage transmission line tower and the protection of high voltage transmission line tower in mining active area.Through the above-mentioned research, this article has realized the accurate prediction of the security of high voltage transmission line towers which is under the influence of mining and realized the due goal. It provides an important important basis of the safe mining of protective coal pillars of high voltage transmission line tower and the protection of high voltage transmission line tower in mining active area. It has the remarkable social efficiency and the economic efficiency.