Coking Coal 4~# Coal Mining Under The Condition Of The Surface Tower Line Protection Research

Based on 4#coal mine of datong mine 8503 working face as the background,in under the influence of mining on the ground between power tower wire protection for research purposes,using mathematical way to forecast,numerical simulation and theoretical analysis,the method of combining the datong mine 8503 face at the top of the safety of high voltage power supply line between tower into the study.First of all,to datong mine the mineral resources of the evaluation,it is concluded that the region of coal coking coal,coking coal in our country belongs to the scarce coal,mining is necessary,but due to the 8503 face top 500 kv high voltage power supply tower,in order to does not cause the damage and influence of the geological conditions in the study of the region,it is concluded that the location of mine belongs to mountainous area and mining thickness ratio is more than 30,can undertake mining and strata is stable.After the two adjacent power tower above the working face in the earth's surface tilt,subsidence,horizontal displacement deformation has made the analysis,it is concluded that the surface of the horizontal deformation and tilt is the main reason affecting the stability of high pressure tower;Second,the position of space with two tower of 3 d coordinate system is established,the calculation of single tower displacement,tilt,sinking and two tower displacement,tilt,sinking and happen will have pulled tight on the wire between them and the critical value of tensile and established the formula of different deformation situation.By using software COMSOL,datong coal mine 4#coal 8503 working face of adjacent above the two power supply tower as the prototype,the numerical simulation model was established,simulated respectively in the working face mining direction is perpendicular to the line direction and parallel to the line direction when the deflection of the power supply tower affected by mining.Through simulation,it is concluded that the power supply tower by the displacement value when the surface deformation,and the simulation results to the calculated by the mathematical formula before,compared with the predictions of the critical value,found that when mining working face is parallel to the line direction,power tower of the Angle of the tilt Angle is greater than the forecast and the national power sector required safety point of view.After using theoretical analysis method for power supply line is the safety evaluation of deformation of tower,it is concluded that,when working face mining direction parallel to the power supply circuit power tower will tilt the safe hidden trouble occurred,sinking to power supply line.At the same time,the paper analyzes the influence factors of power between the tower and ground surface deformation and the change rule.Finally,according to the actual circumstance of datong mine 8503 working face,the way to prevent the deformation of the surface at home and abroad from underground mining and filling tower strengthening maintenance to protect the high voltage power supply tower above the surface.