Drawing Theory And Its Inspection

Stope-caving system has been widely used at home and overseas. Among the tonnage ofores which were mined with stope- caving system in our country, the tonnage of ferrous metalaccounts for percent 85,and the tonnage of non-ferrous metal accounts for percent 30 .Themines which use stope-caving system to mine account for percent 25 or so among all mines.With the developing of mining technology and with the increasing of depth, the proportion ofusing stope-caving system is getting increase.The ores mined with stope-caving system are drawn out under the rock .If the parameter ofstope structure is illogical and drawing control is improper, it will cause more loss and dilution.So studying of the ore-rock moving law, optimizing of the stope structure parameter andcarrying through drawing control will be significant to decrease loss and dilution, and toincrease economical benefits.Drawing theory is to study the avalanched ore-rock moving law under the surroundingrock. Now the relatively systematic drawing theory are elliptical drawing theory, quasi-ellipticaldrawing theory, stochastic medium drawing theory and creep theory. Creep theory may beconsidered as one elliptical drawing theory.Elliptical dlawing theory has founded for so long time that it has great influences.Stochastic medium drawing theory is a new diawing theory. A lot of investigators the that thetwo theories exist some practical and theoreticall shortages. Quasi-elliptical drawing theory wasfounded by Prof. Li Rongfu of xi'an university of architecture and technology in 1994, whichcontains good part of rational kernel of elliptical drawing theory (for example, the sameequation of displacement curve, the same equation of transition, the same equation ofcorrelativity, the average second swell factor is constant). Which solves the existing problemsand shortages of elliptical drawing theory (for example, discharging shape, moving boundary,field of velocity, field of density), which first studies the field of density and his change whenthe bulk is drawn out, which definitely distinguishes the ideal and practical bulks, and foundideal and practical equations of quasi-elliptical drawing theory, which brings forward thecontinuous flowing verification and the moving boundary verification,proving that quasi-ellightal wt ler can all pe the two vtrifiedrm ANle ellightal ~ tw canonly ~ or at pe the two ds .From aboVe the ch Of quasedlpeforng theq pe has ~ bo the StUdy Ofwt theq .So this thesis Seed the-- SUbod ofdIawing tw ed to stUdy the qUaS-ew dIatw theq forun nd to Study the ds of draWing theq.Wh the helP of ch, this tois -- the folOwing wot about the StUdy of qUaSiellighca dIaWing theq and the verihation oftw theOry.l 1 wi nd wi the disctw sbe by the at of wiat ndother -- data tw that the dithe tw ~ of ~-el~ mUchrm wt wh the bo ~ wt ds or is ed.2. Diho dids or dibo tw bo bo ewn ds thedIaWing COnditiere, nd IxDVed that the tw ofdisctw ~ wt with the wt toO.m(Xed > 0.5 di~ bo Of big on the mp nd snd at themn + n + l Jbomm(xed < 0.5 dithe tw of snd on the mp and bis at themn + n + l'bom(r) ed == 0.5 ndar dithe tw ou the tOP nd at the bottommn + n + l3. Cowt nd analyZingthe disPW CUrV Of bulks, pe by the at ofK2experhas ~ng hathe pe curv wi (Y' = Z"' ) is the bo mpwion whae wi ds are is dsed.4. StUdying the ds ~ and its USag tO ~ and ~ the beodnts on the basis Of the bo qUaStalopcal dIaWing tw:a) Fodng the ~ ha Ofbooo equatiou on the basis of bo peSpeCial bo ofedon tw nd by usbe the ~ form ofaton ~on haVgot some for wi or nuasbell~ tw theq wtri it be IxDVingquasedl~ ~ tw is drict and ghb) bo that the Nuation peiere Of ditw ~ of nd and iedbulk are W nd exPainin the detrihon ofdischwt tw in thWc) Educing tha tw tw is nuasedl- nd bo is ellbod ds6 -- ch mml); nd that ~tw tw is pel~4 also isell~d Unds ch edere (melpel), bUt is at as are as the bo of --~ ~co Which twns the righ coedusbo of...