Sishanling Mine Deep Shaft Construction Method And Stability Analysis Of Wall Rock

In recent years,China's demand for metal mineral resources continues to grow,the self-sufficiency ratesofiron ore and other major resource are insufficient,theshallow mineral resources are gradually exhausted and requiring to mine deep mineral resources.Mine shaft is the key of mine,although it only accounts for 10%of the full work amount of the mine construction,but the duration is often more than 40%of the total duration of the mine construction.The stability of shaft wall rock is a key factor affecting the safe and efficient construction.Therefore,this article centers on the stability of Sishanling 1500m auxiliary shaft,methods include on-site investigation,research laboratory experiments,theoretical analysis and numerical simulation.First of all,according to Sishanling 1500m ultra-deep construction technology,combined with the practical problems encountered in the construction,to explore the development direction of deep shaft sinking equipment and technology.Secondly,using elastoplastic theory,deduced shaft wall rock stress and displacement theory formula or without lining two cases.And use FLAC^3D to validate the theoretical formula.Then through laboratory experiments to determine the basic mechanical parameters of the rock about 750m depth,and use the stored energy of rock under uniaxial,brittleness coefficient,elastic strain energy and fracture fragments statistical identification method to determine the rock burst proneness rock specimens.Thereby predicting 1000?1500m segment mixed granite rock burst.According to "Auxiliary Geotechnical Investigation Report",with the Q system classification method to evaluate the quality of the surrounding rock.Finally numerical simulation method of shaft stability 1000-1550m wall sections were studied to determine the wall displacement criterion relatively unstable segments.Then unstable segments detailed modeling analysis,the distribution of plastic zone,stress and displacement.Finally,the safety factor method and the rock burst proneness stress analysis on stability of surrounding excavated quantify simulation study to determine the area and the rock burst proneness distribution of wall rockbreak.