highwall mining 1
TRANSCRIPT
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HIGHWALL MINING
Presented by
P.Prudhviraj
N.Vijender
S.Rajesh
J.venkateshwarlu
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Highwall Mining Driing !arallel roadways into highwall" coal seam using
remote controlled mining machinery # $%% '%% m de!th
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Highwall Mining (ystems )*+ cont,
Addcar (ystem Launch ehicle Coneyor cars
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Highwall Mining (ystems )$+
Archeyor system
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Highwall Mining
Highwall Mining (ystems )-+
Auger system
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Geotechnical Issues & .ating
/nsu!!orted s!an sta0ility
Pillar sta0ility Panel (ta0ility
Case studies
Design guidelines
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Highwall Mining
/nsu!!orted (!an (ta0ility
1y!ical 2ailure mechanism # delamination & sna!through
(im!le analytical # thic3ness o2 roo2 !late4 54
Pro0a0ilistic a!!roach .ealistic !rediction # Geology4 roc3 !ro!erties
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Highwall Mining
Pillar (ta0ility
La0 testing o2 coal strength
6m!irical a!!roach
Pillar sta0ility modelling A!!lications and eri2ication in 2ield
Pillar Strength v. Width/Height
0
5
10
15
20
25
0 1 2 3 4 5
Pillar Width/Height
P i l l a r
P e a k
S t r e s s
( S t r
Proposed HWM
Wagner
Bienawski
Average Trendline
0.36W/h)0.6!"6.00 +=Strength
0.36w/h)0.6!"6.00 +=Strength
0.!!w/h#w$0.6%W +=
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Design Guidelines
*' 3ey 2actors are considered4
e,g, roo2 condition8 mine resere
etc,8
9ey 2actors are weighted
di22erently in HMI8
/ncertainty on :udgement is
incor!orated,
A gien site has two inde;
alues< HMI rating4 con2idence
leel,
.ecommendation is gien 2or
any HMI"Con2idence ratings,
0
10
20
30
40
50
60
70
80
0
100
0 10 20 30 40 50 60 70 80 0 100
Highwall Mining Index (HMI)
C o n f i d e n c e L e v e l ( )
!
!ood si"e #or $HM
%ining
"
Possi&l' a good si"e
#or $HM %ining( More
in#or%a"ion is need(
#)i"e apparen"l' *ns*i"a&le
#or $HM %ining( +*r",er
eval*a"ion %a' &e needed i#
new in#or%a"ion is availa&le
$
)i"e *ns*i"a&le #or
$HM %ining(
%ransition
&one
-.a%ple pi" 1
& Highwall Mining Inde; )HMI+ has 0een deelo!ed
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Guidance Control )*+
Driing !arallel roadways remote miner $%% to '%% m de!th
Pro0lems Cutthrough=s connection Pillar 2ailure 2re>uent roo2 2alls Limited !enetration de!th
panel 4
/4167
panel 3
/2140
panel 2
/1120
panel 1
/110
$raks on "op
o# ",e ,ig,wall
)*rve' da"a
$raks on ",e
#ae o# ",e
,ig,wall
&serva"ion
or",
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Guidance Control )$+ Problems to solve
Uncertainty in pillar size
Frequent cut-throughs
Reduced penetration depth
pillar/panel failure
Guidance system Military grade nertial !avigation "ystem
ndependent odometer
#ontrolling computers
$perator displace and interface
%chievements Used in every &'M system in %ustralia
!o mining equipment lost due to collapse
Penetration depths increased - ()*m to )+*m
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Failures )*+
Panel 2ailure
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?e2ore A2ter
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Local !anel 2ailure at 5arra0ee MinePanel 2ailure at /lan Mine
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Failures )$+
Panel 2ailure
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Lac3 o2 site inestigation
Poor 3nowledge on s!an sta0ility
Inade>uate !illar design
Poor guidance control
Critical !anel width
Lac3 o2 3nowledge on insitu stresses
No monitoring and 2eed0ac3
Factors contri0uting to !illar"!anel 2ailures
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Production Production @ * million tonnes !er year
6m!loyees # '% )High !roductiity # main adantage+
Continuous inert gas in:ection *'% l"s Penetration de!th # aries # *%% to '%% m )A -%%m+
Gas issues
(ta0ility issues 6ach roadway drien # almost in one day )or less+
Production share in Australia # *B
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Conclusions
Main attraction # high !roductiity and low cost
(uita0le 2or certain conditions # '%% m 0oundary
May lead to more 2ires and colla!ses Around '%B o2 e;traction
Creates !ro0lems 2or dee!er reseres
Production share in Australia # *B
Punch longwall # !re2erred 2or large reseres
High !roduction and longer term iew
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1HAN9 57/