8194

7592

كارشناسي ارشد

مكانيك سنگ

اصفهان: دانشگاه صنعتي اصفهان، دانشكده معدن

1392

هفده،127ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

راحب باقرپور، لهراسب فرامرزي

سعيد مهدوري

5/9/92

مسعود چراغي، عباس اسلامي حقيقت

مهندسي معدن

ID7592

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

128 Optimization of long wall face length upon effective factors by numerical methods case study Tabas Parvadeh 1 coal mine Mehdi yazdanpanah m yazdanpnah@mi iut ac ir Date of Submission 2013 09 16 Department of Mining Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Raheb Bagherpour bagherpour@cc iut ac irDr Lohrasb Faramarzi lfaramarzi@cc iut ac irabstractIn mining of an ore body the study of effective parameters and selection of the best condition could beaffected in reduction of mining costs The long wall mining method is one of the most commonmethods in coal mines Tabas coal mine is located in 75 km from Tabas twon The Parvadeh mine ispart of Tabas coal mine that its thickness of mining seam C1 is about 2m and its extraction method isby backward longwall mining Main gates of mine is supported by rock bolts and IPB160 steel sets The aim of this research is to determine suitable width of ribs convergence of tail gates and optimumlength of panel in l in order to obtain this object the required ribs width with variation of seams depthand workface length was investigated by using the software FLAC3D For this approach consideringthe gof distance workface length depth and position of the bedding layer the convergence of themain gate was modeled and analyzed The amount of damage distance as for the layer bedding and depth was be modeled and analyzed Andthe optimal length of workface as for gof distance seam depth and bedding was investigated by usingthe software FLAC3D The results show that the width of ribs increases due to increasing the workfacelength But for lengths up to 220 m rib width did not change Considering this fact that near the workface the pressure is high Convergence of the main gate wasincreased And far from the workface the convergence was decreased At a distance of 70 80 metersfrom the workface it reached to the initial value Main gate converge is high and increases byincreasing gof distance bedding layer depth and length of workface But for lengths up to 220 m stressinduced in ribs is almost constant Convergence of the main gate remains unchanged One of theimportant parameters in longwall mining method is gof distance that decreases by increasing of depthand increases due to increasing of bedding and strength properties By changing the properties of roofcoal the optimum workface length was changed and the optimum workface length was decreased byincreasing of bedding and layer depth Key words optimal workface length numerical modeling sensitivity analysis Tabas Parvadeh coalmine gof distance

راحب باقرپور، لهراسب فرامرزي

سعيد مهدوري

مسعود چراغي، عباس اسلامي حقيقت