Baoguo Tiedanshan Mine Area Along Veins Transport Roadway Stability Analysis

Baoguo Tiedanshan mine ore body condition is very complex,for the wall rock is alteration,ore-body structure tends breaking easy,the rock stability is poor,the foot surrounding rock has features with low compressive strength,deformation,pressure quickly,easily broken when it mix together with water,expansion apt to cause deformation damage and so on.as a result,the stability of mine haulage tunnel along veins becomes very prominent,including affected as vulnerability with pressure,shortly deformation cracking after the completion of construction of roadway,then nicking,caving and settlement have been produced,hence it iMPacts seriously on the mining exploitation and transportation.Based on field testing,this paper put into use software FLAC3D to analysis and forecast the roadway stability by numerical simulation in Baoguo Iron mine Hill ground pressure variation,it can predict the damage within a certain range of surrounding rock,we can change the mine transportation lane location and optimize stoping mine order,thus it will minimize the influence the pressure cause.The paper will discuss the optimizing design in transport way for the ore mountain,and make sure that mine has efficient,stable and quiet production.The main research work as follows:(1)Study the mountain in ground pressure behavior through tunnel convergence monitoring.The main level is located +35m and +20m,including +35m level for the main mining face,+20m level for pioneering work which has been basically completed.From the investigation of site monitoring in two levels of ground pressure behavior phenomenon.We found press-show phenomenon in the following:Concrete cracking,the roof or wall sloughing,roof caving(less),seepage,floor heave significant.(2)Based on uniaxial experiments and field tests to establish the numerical model Including:exact Hoek-Brown strength criterion of rock parameters,ANSYS numerical model Establishment;numerical calculation of rock parameters given FLAC3D through mole Coulomb constitutive.(3)By numerical simulation and field monitoring,it indicates footwall dykes transportation roadway in stress concentrated area,and adjacent to the footwall ore rock contact zone,therefor,it forms a large-scale plastic zone around the tunnel,causes great damage to surrounding rock stability.We recommend an appropriate adjustment along the footwall veins transport lane position and away from the ore rock contact zone,it can help reduce damage of the roadway along veins transport.(4)Four kinds of Mine Roadway layout optimization and two stope mining sequence optimization program,they are based on Tiedanshan geological condition and mining,we have a coMParative analysis in a number system on three types,the perspective of numerical simulation of the displacement field,stress field and plastic zone.we analyze the irnfluence of several optimization transport lane to the pulse pressure distribution along the footwall.By considering the displacement field,stress field and plastic zone distribution and overall economic efficiency,we select the roadway optimization number three optimization is the best,it recommended a multi-section mining in the same time(middle to the sides),single mining segment about sides to the middle.