Study On Surrounding Rock Stability Of Deep Mining Laneway

With the rapid development of economic,the demand of the mineral resources increases, mining area expands, shallow and easily mining resources exhausts,mining gradually go to the deep.Because of the huge rock pressure and large deformation of surrounding rock mass under deep mining condition, support and daily maintenance of laneway become very difficult. In addition, deep mining will lead to surface subsidence, tunnel fall, rock burst and the other disaster . In order to avoid the frequent occurrence of disasters, and provid the necessary suppport for laneway,it is particularly imperative and important to study stablity of surrounding rock. Under the support by Natural Sciense Foundation for Talented Youngs of Chongqing and the Supporting Program of New-Century Talents by the Ministry of Education,this paper made the following aspects of research, main conclusion are summarized as follows:â‘ Through long-term monitoring of pressure and displacement instrument which are fixed in some important laneway in-425m,-475m and-525m depth below ground level of Qixiashan mountain,the trends of stresses and displacements in roof and walls of laneway is determined.â‘¡The trends of stresses and displacements in roof and walls of laneway is predicted by using the prediction model of grey theory.The predict results is in good agreement with the monitoring datum.It is shown from the numerical results that the prediction model is correct.â‘¢The fields of stresses and displacements of the surrounding rock masses under different mining condition simulated by using FEM.The rules of stresses and displacements of the surrounding rock masses under different mining condition are revealed.Comparing the numerical results of stresses and displacements with the monitoring datum,it is found that the numerical results are in good agreement with the monitoring datum,which put forward the theoretical basis to analyse the stablity of the surrounding rock masses.