Research And Application Of Surface Tower Protection Technology Under The Influence Of Mining In 15205 Working Face Of Shouyang Mine

With the development of the country and the increasing demand for resources,it is imperative to improve the recovery rate of coal as a primary energy.The coal resources under the high-voltage power supply tower have become a mining problem.The premise of solving the subsidence problem is to ensure the normal use of the ground tower.Therefore,the maximum recovery of coal resources under the tower has become a key problem to be solved urgently.Based on the summary of mining subsidence,mining under high-pressure iron tower and mining subsidence reduction methods at home and abroad,this thesis takes the influence of mining on high-pressure iron tower in 15205 working face of Shouyang Coal Mine as the research background.Through theoretical analysis,field measurement of mining subsidence and numerical simulation,the surface subsidence law caused by mining in 15205 working face of Shouyang Coal Mine is analyzed,and the protection and reinforcement measures of high-pressure iron tower are studied.The results are as follows :(1)The geological situation of 15205 working face is briefly described,and the distribution of high-voltage power supply towers in the mining range of the working face is studied.According to the mining subsidence theory and field measured data,the numerical model established by UDEC numerical software is used to calculate the theoretical height of ’ three zones ’.(The caving zone and fracture zone are 44.91 ～47.42 m,and the bending subsidence zone is 52.58 ～ 55.09 m).(2)The influence of different mining heights below the tower on overburden failure and surface subsidence is analyzed.The influence of different advancing lengths of working face on stress distribution,fracture development distribution,surface displacement change and tower displacement change of overlying strata is analyzed.(3)In order to slow down the subsidence and subsidence speed of the tower foundation,the methods of ’ limited thickness mining,continuous mining and uniform speed mining and multi working face coordinated mining ’ are put forward.Through the establishment of ground monitoring stations,the construction of joint foundations,grouting reinforcement,tower maintenance and correction during mining,the settlement and deformation of the tower are controlled,and the tower is reinforced and corrected.The research results provide important engineering decision-making basis for the mining of 15205 working face in Shouyang Coal Mine,and also provide reference for the protection of high-pressure iron tower under similar mining conditions.There are 73 figures,9 tables and 84 references in this thesis.