PERFORACION La pe perfo rfora raci ción ón es un unaa op oper erac ació iónn un unita itaria ria de dent ntro ro de la ac activ tivid idad ad de dell desarrollo del proceso de una operación minera, mayormente utilizada en la exploración, desarrollo y explotación de un yacimiento minero; constituyéndose junto con la voladura como la actividad de mayor atención y dedicación por las enormes implicancias que genera en las operaciones unitarias subsecuentes e incluso en la etapa de tratamiento. Podemos definir como el proceso de abrir un ueco cil!ndrico de di"metro y longitud variable pero limitado en la roca a la cual se le denomina taladro por medio med io de acceso accesorio rioss y maq maquin uinas as de dif difere erente ntess cap capac acida idades des,, dimens dimension iones es y cara ca ract cter er!s !stitica cas. s.
Por Por su na natu tura rale leza za est estee tema tema eess muy muy amp amplio lio pe pero ro par paraa nues nuestr troo
caso solo se van a exponer las bases que sirvan de gu!a para un estudio mas profundo de parte del lector.
I.- SISTEMAS DE FRAGMENTACION DE ROCAS #l someter la roca a cualquier sistema de fragmentación o desintegración, los los me meca cani nism smos os qu quee se ap apliliqu quen en tend tendr" r" la fina finalid lidad ad de ve venc ncer er las las fuer fuerza zass principales de coesión y resistencia de los componentes de la roca. 1.- SISTEMAS DE FRAGMENTACION FRAGMENTACION CON TENSIONES. Los esfuerzos tensionales son las causas para que una roca se rompa, ya sea por una fractura a tracción o por una fractura de cizallamiento a compresión. 1.1 FUERZA NORMAL NORMAL E INCLINADA. La fuerza normal.$ normal.$ %n una sola cara de ataque se producen dos componentes simétricos &percusión'. La fuer fuerza za n!l n!ln na" a"a. a.--
%s ap aplilica cada da en rela relaci ción ón a su supe perfi rfici cies es
expuestas dentro del taladro &rotación'.
1
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Perforación a percusión
Perforación por rotación
%n cualquier caso las tensiones producidas por la broca generan un peque(o volumen de roca quebrantada en la proximidad inmediata a la superficie de contacto entre la roca y la broca, generando as! fracturas extensivas de corte y tracción en un mayor volumen de la roca circundante. 1.# ESFUERZOS DE COMPRESION PARALELA PARALELA A LA CARA CARA LI$RE Los esfuerzos de compresión principal y mayor que act)an paralelas a la cara libre, originan roturas paralelas a ella, rompiéndose la roca en fragmentos de tipo laja &capas'. *n ejemplo es la perforación térmica, donde al calentar la roca con una antorca llega a astillar la roca por el enfriamiento brusco que se produce.
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7asa 4eferencial de Perforación2 7P-0 %
#8%74- %L 74%P#<-
7#0# 7#0# &mAr' &mA r'
4-+# Dranito
&mm' :=9
+aliza ura
:=9
9.9
8agnetita
//=
:.99
8ena de ierro
//=
9.9
Dneis
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9.?9
9.19
%.#. PERFORACION PERCUSI&A POR IMPACTO PROPULSADO %n este sistema la penetración a la roca se produce por la fuerza de empuje o energ!a desarrollada por m"quinas de propulsión neum"tica, idr"ulica y en ocasiones eléctrica. %squem"ticamente el sistema es2
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#.% FRAGMENTACION POR MICROONDAS. La radiación con microondas alterar" la roca para que las maquinas puedan arrancar f"cilmente los fragmentos. %.- TIPOS DE FRAGMENTACION DE ROCAS. 0e produce mediante. a.$ Pe Perforación
2
Penetración &3arreno'
b.$ esagregación
2
%xcavación &4ozadoras o 5resadoras'.
c.$ 5ragmentación
2
6oladura & #nfo Pesado'
d.$ +onminución
2
7rituración & 8olinos, +ancadoras'
II.- TECNOLOGIA DE PERFORACION DE ROCAS COMO INTALAR UNA MA(UINA PERFORADORA. &ver diagrama 9:'. Posición +orrecta del Perforista. •
•
Pararse sobre piso seguro &limpio y nivelado'. #poyarse firmemente sobre sobre ambos pies.
•
+olocarse detr"s de la m"quina o a un costado &mejor al lado izquierdo'.
•
Las mangueras deben estar ubicadas al costado dereco de la m"quina.
•
+oja con la mano dereca la manija de la m"quina y con la izquierda la llave de mando.
•
8antenga presión sobre la m"quina, solo lo suficiente para evitar que la maquina se levante, ejerciendo un ligero empuje acia adelante.
•
0i presiona muco puede desviar el barreno y plantarse.
PRECAUSIONES AL INGRESAR AL FRENTE DE TRA$A*O &ver TRA$A*O &ver diagrama 9/'. Precauciones #ntes de nstalar una 8aquina
•
6erificar 6erificar el abastecimiento de agua y aire2 presión y caudal. #segurar de tener erramientas a la mano2 mano2 barretilla de => y ?>, llave 0tilson
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Da+rama ,1 COMO INTALAR UNA MA(UINA PERFORADORA Conectar un extremo de la manguera aire (3/4” – 1”) a la tubería
oplar manguera (!u"etando) Conectar otro extremo a la m#$uina
Conectar manguera agua aire (1/2”) a la tubería
%acer correr agua
Conectar otro extremo a la m#$uina Limpiar lubricador (chanchita)
&e!tapar
Llenar aceite
'apar
Lla*e! de m#$uina cerrada!
robar la peroradora
Caudal re!i+n de aire agua
uncionamiento pie de a*ance Colocar barreno! parado!
olpe nitide6 rapide6 -otaci+n uniorme
oner m#$uina en direcci+n correcta
Lubricaci+n7 aire con oil
Colocar barreno a m#$uina ,!egurar la! ua! del pie de a*ance
PROCEDER A LA PERFORACION
',L,&-.
ate r
eguid
a!ad
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Da+rama ,#
PRECAUSIONES AL INGRESAR AL FRENTE DE TRA$A*O
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%l nivel de perforabilidad se determina de acuerdo al grado de resistencia que ofrece la roca a ser perforada, la perforabilidad de la roca depende de sus caracter!sticas, como son2 a. ureza. b. 7ama ma(o (o de gran grano. o. c. 7extur xturaa y estru estruct ctur ura. a. d. #bra #brasi sibi bida dad. d. e. 4esistenc 4esistencia ia a la compresión compresión y tensió tensión. n. f. Pes Peso esp espec ec!f !fic ico, o, etc. etc. -tro aspecto para determinar la perforabilidad asociada a los anteriores es el tipo de instrumento con el que se realiza la perforación. #.- CLASIFICACION DE LAS PERFORACIONES ) SU MECANISMO GENERAL. #.1 SEGN EL SISTEMA (UE SE INDUCE. a Perf Perfor ora! a! n n Me!/ Me!/n n!a !a..Puede ser percusiva en rocas suaves, y rotativas en rocas duras. 0on producidos por esfuerzos inducidos mec"nicamente. 0 Perf Perfor ora! a! n n Trm Trm! !a. a.-%s producida por esfuerzos inducidos térmicamente, teniéndose a la perforación por flama o corro térmico &jet piering' para rocas duras. ! Perf Perfor ora! a! n n 2"r 2"r/u /ul l!a !a..+on agua a presión. " Perfo Perfora! ra!n n 3or 3or Fu4 Fu4n n 5 &a3o &a3orz rza! a!n. n.
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:
Labores orizontales.
:
Labores nclinadas.
:
Labores 6erticales.
! Perf Perfor ora! a! n n en Pro" Pro"u! u!! !n n :
0ubterr"nea2 tajeos.
:
7ajo #bierto2 3ancos.
" Perf Perfor ora! a!o one ne44 E43e E43e! !al ale4 e4 :
%mpernado de 4ocas.
:
0ote +rete.
:
+able 3olting2 0istema de refuerzos para explotaciones masivas.
:
Para voladura controlada &smoot 3lasting'.
#.% SEGUN EL E(UIPO DISPONI$LE. DISPONI$LE. a Perf Perfor ora! a! n n Ma Manu nual al.. BacC Leg, 0topper, PicC ammer, BacC ammer. 0 Perf Perfor ora! a! n n Me Me!a !an nza za"a "a.. :
Perf Perfor orad ador oras as Pesa Pesada das2 s2 Bu Bumb mbos os,, 4ail 4ail ril rilll &rie &riele les' s'.. +av +avo ril rilll &neumaticos'. 7racC rill &oruga'.
:
Perforadoras 0uper Pesadas2 Perforadoras 4otativas.
#.' SEGUN LA SECUENCIA SECUENCI A DE APLICACION. APLICACION. a Perfor Perforaci ación ón Prim Primari aria2 a2 Perf Perfora oració ciónn n$0i n$0itu. tu. b Perf Perfor orac ació iónn 0ecun 0ecunda dari ria. a. #.8 SEGUN LA DIMENSION DEL AGU*ERO. AGU*ERO. a Perf Perfor orac ació iónn de de 7a 7aladr ladros os.. 7aladros cortos y largos ambos de diferentes di"metros.
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4-+# taladro >0?'0
0A0C>'.'-,?@. -
'-,?@.-
P%45-4#-4#
3#44%<-
34-+#
PRINCIPIOS DE PERFORACION 8%-
%5%+7- <+#L 8#47LL-0 $
%5%+7- 5<#L #stillamiento y trituración de la roca #stillamiento y trituración de la roca
Perforación Dolpe por fricción 4-7#+-< rotatoria y presión &open pit' Perforación #34#06- 5ricción y rayado iamantina &diamantina' &sin golpe' &exploración'
7rituración 7rituración
ELEMENTOS DEPENDIENTES DE UN TALADRO. TALADRO . •
#8%74-2
E i"me mettro F m"s f"cil y económico ico2 :A/@ G :.=@
•
L-
+ort. 8ed. Larg.2 H> G I?.1> &H9m' prod.
•
4%+77*2
$ epende2 tipo de roca, método de perfo rforac ración. $ nfluye2 distribución del explosivo.
•
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*sado para perforaciones verticales en exploraciones y para roca suave a semi$duras, y en bancos para explotación. La penetración en la roca se produce por la descarga de energ!a de ca!da ca! da por graved gravedad ad del ele elemen mento to tritura triturante nte den denomi ominad nadoo 74%P 74%P#<-. %xisten dos tipos a Por
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&0istema Pensilvanense'. *tilizado para abrir taladros de profundidades y di"metros grandes &muy lento'. b Por
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&0istema +anadiense'. Para di"metros y profundidades peque(as &lento'. %.1.1. COMPONENTE FUENTE. %s la m"quina encargada de levantar el 74%P#<- y dejar caer ca er librem libremen ente te de una alt altura ura det determ ermina inada da en forma forma con continu tinua. a. 0us elementos principales son2
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atasque en el fondo del taladro y la barra de carga, que otorga un peso suplementario.
%.1.%. COMPONENTE APLICADOR. APLICADOR. %s el elemento denominado 7répano que ace contacto o impacta contra la roca, cumple las siguientes funciones2 a 4omp 4ompee la roca roca in$s in$situ itu en trozo trozos. s. b 7ritur ituraa los los troz trozoos. c #vanz #vanzaa mant manteni eniend endoo un di"met di"metro ro consta constante nte del del agujero agujero
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