Coal mining under television signal tower and its dynamic tilt adjustment protection technology

In order to mine the coal resources under the TV signal tower and protect the safe operation of the TV signal tower,the mining deformation characteristics of the TV signal tower caused by mining and its tilt dynamic adjustment protection technology were studied on the basis of analyzing the law of surface movement and deformation induced by coal mining. Probability integral method was used to calculate the ground surface movement and deformation where the tower located,and its operational safety was evaluated. Based on the results above,the overturning stability of the tower under the influence of mining was analyzed. The calculation results show that the inclination deformation of the iron tower foundation exceeded its inclination deformation limit value after the coal panel was mined out, and the operation of the iron tower had a safety risk,the anti-overturning ability of the structure was not satisfactory. On-site monitoring of the movement and deformation of the tower was carried out. The monitoring results showed that the TV signal tower showed a step-like subsidence trend with the advancement of the coal working face. When the coal working face stopped advancing or the advancing speed was very slow,the uneven settlement of the tower base would increase greatly,resulting in an increase in the tilting deformation of the tower. The dynamic protection principle of the tower deformation was expounded,and the mining deformation dynamic inclination adjustment technology for the TV signal tower was proposed and implemented. The dynamic inclination adjustment time of the iron tower was determined according to the monitoring results of the tower movement deformation. The inclination of the tower base after the inclination adjustment was less than the mining inclination deformation limit value of the TV signal tower,which ensured the safe operation of the TV signal tower,and successfully realized the coal mining under the TV signal tower,in turn it greatly improved the ratio of resource extraction. The study has produced significant economic and some social benefits,and verified the feasibility of implementing the dynamic deformation protection technology to mine coal under the TV signal tower.