Subsidencia 03
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Transcript of Subsidencia 03
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Diploma Planificacin Minera
Mtodos de prediccin de
Subsidencia en Block Caving
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Diploma Planificacin Minera
Implicancias al diseo
Ubicacin infraestructura en superficie
Ubicacin de infraestructura subterrnea
Secuencia de extraccin de sectoresproductivos
Clculo de reservas (angulos de flujo)
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Diploma Planificacin Minera
Contenidos
1. Mtodos prediccin subsidencia1. Empricos (Laubscher)
2. Equilibrio limite
Ecuaciones de equilibrio limite
Grficos construidos a partir de analisis de
equilibrio lmite
Modelos numricos
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Diploma Planificacin Minera
Laubschers chart to determine cave angle
(angle of break) (Laubscher 2000)
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Diploma Planificacin Minera
Ejercicio
Estime el ngulo de quiebre global
utilizando la metodologa de
Laubscher para la secuencia de
dominios representada
Dominio MRMR Profundidad
Altura mineral
quebrado
1 50-60 500 410
2 50-60 400 310
3 50-60 300 210
4 30-40 200 110
5 20-30 100 10
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Diploma Planificacin Minera
Evolucin de modelos de equilibrio lmite(Flores y Karzulovic 2004b)
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Diploma Planificacin Minera
Scoping and Pre-feasibility
Use design charts:
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Diploma Planificacin Minera
Grficos de diseo- angulo de
quiebre
45 50 55 60 65 70 75 80 85 90
Ang le of Break, b(degrees)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
UCL
Dep
th,
HT
(me
ters
)
Rock Mass Geotechnical Qual i ty
Poor to Fair
Fair to Good
Good to Very Good
b
HT
45 50 55 60 65 70 75 80 85 90
Ang le of Break, b(degrees)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
UCL
Dep
th,
HT
(me
ters
)
Rock Mass Geotechnical Qual i ty
Poor to Fair
Fair to Good
Good to Very Good
b
HT
b
HT
Figure 10.1: Design chart for estimating theangle of breakin a transition from open pit to
underground mining by block/panel caving,
for rock masses of different geotechnical
quality and UCL depths in the range from 600
to 1700 m. The value of b
can be obtained if
the UCL depth,H
T
= HP
+ HC, and the rockmass quality are known.
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Diploma Planificacin Minera
Grficos de diseo- distancia de influencia
0 50 100 150 200 250 300 350 400 450
Inf luence Zone Width, iz(m )
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
Cra
ter
Dep
th,
HT
=H
P+
HC
(m)
Rock Mass Geotechnic al Qual i ty:
POOR to FAIR H
P= 1200 m
HP= 800 m
HP= 400 m
b
iz
HT
0 50 100 150 200 250 300 350 400 450
Inf luence Zone Width, iz(m )
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
Cra
ter
Dep
th,
HT
=H
P+
HC
(m)
Rock Mass Geotechnical Qual i ty:
POOR to FAIR H
P= 1200 m
HP= 800 m
HP= 400 m
b
iz
HT
b
iz
HT
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Diploma Planificacin Minera
0 50 100 150 200 250
Influence Zone Width,IZ
(m)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
CraterDepth,
HT
=
HP
+
HC
(m)
Rock Mass Geotechnical QualityFair to Good
HP
= 1200 m
HP
= 800 m
HP
= 400 m
b
izH
T
0 50 100 150 200 250
Influence Zone Width,IZ
(m)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
CraterDepth,
HT
=
HP
+
HC
(m)
Rock Mass Geotechnical QualityFair to Good
HP
= 1200 m
HP
= 800 m
HP
= 400 m
b
izH
T
b
izH
T
Grficos de diseo- distancia de influencia
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Diploma Planificacin Minera
0 20 40 60 80 100 120 140
Influence Zone Width,IZ
(m)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
CraterDepth,
HT
=HP
+
HC
(m)
Rock Mass Geotechnical QualityGood to Very Good
HP = 1200 m
HP = 800 m
HP = 400 m
b
izH
T
0 20 40 60 80 100 120 140
Influence Zone Width,IZ
(m)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
CraterDepth,
HT
=HP
+
HC
(m)
Rock Mass Geotechnical QualityGood to Very Good
HP = 1200 m
HP = 800 m
HP = 400 m
b
izH
T
b
izH
T
Grficos de diseo- distancia de influencia
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Diploma Planificacin Minera
Subsidence resulting from BPC operations, El Teniente
Mine, Chile (Flores & Karzulovic 2002)
Braden
Pipe
QuebradaTeniente
Teniente 4
Fortuna
Teniente 4Regimiento
Teniente 5Pilares
Teniente3 Isla
TenienteSub 6
Teniente
4 Sur
N Craterperimeter
Cavedrock
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Diploma Planificacin Minera
Plan view of production sectors and subsidence
crater perimeter, El Teniente Mine, Chile (Flores2004a)
Teniente 4
South
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Diploma Planificacin Minera
Section A-A showing subsidence data for El
Teniente Mine, Chile (Flores 2004a)
South
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Diploma Planificacin Minera
Example of the use of a
design chart to make a
preliminary estimate of angles
of break,
El Teniente Mine, Chile(Flores 2004a)
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Diploma Planificacin Minera
Ejercicio
Caso de estudio determinacin ngulos de
quiebre y zona de influencia proyecto
transicin subterrneo:
Profundidad subterrnea: 1600 m
Profundidad pit final: 1200 m
Altura de columna = 500 m
GSI = 60-75 (pared Este)
GSI= 40-55 (pared Oeste)
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Diploma Planificacin Minera
Efecto y ajustes de la superficie debido a
confinamiento (after Hoek 1970)
r= horizontal radius of curvature of slope, h= slope height
Concavo
Convexo
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Diploma Planificacin Minera
Suggested adjustments for curvature of a
concave subsidence crater wall (after Flores 2004a)
If r/hs< 1, the slope will be much more stable than a straightslope. Use the chart or calculated value as a lower bound tothe angle of break; add 10oto estimate an upper bound
If 1 < r/hs< 2, use the chart or calculated value as a lower
bound to the angle of break; add 5o
to estimate an upperbound
If 2 < r/hs< 5, the slope will be slightly more stable than a
straight slope. Use the chart or calculated value as aconservative estimate of the angle of break
If r/hs> 5, use the unadjusted chart or calculated value
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Diploma Planificacin Minera
Suggested adjustments for curvature of a
convex subsidence crater wall (after Flores 2004a)
If r/hs< 1, the slope will be much less stable than a straight slope.
Use the chart or calculated value as an upper bound to the angleof break; subtract 10oto estimate a lower bound
If 1 < r/hs< 2, use the chart or calculated value as an upper
bound to the angle of break; subtract 5oto estimate a lowerbound
If 2 < r/hs< 5, the slope will be slightly less stable than a straight
slope. Use the chart or calculated value as an upper bound to
the angle of break; subtract 2
o
to estimate a lower bound
If r/hs> 5, use the unadjusted chart or calculated value