rock anchor tests in conglomerate
TRANSCRIPT
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BERIS DAM PROJECT
ROCK ANCHORTESTS
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ROCK ANCHORS AT
VARIOUS STRUCTURES
Structure Anchor dia
(mm)
Spacing
(m)
Length
(m)
Total No. Purpose
Main Dam Toe - Slab 25 1 4 1084 Provide anchorage of toe
slab with foundation to
improve sliding resistance
and provide support against
grouting pressure.
Spillway 32 2.0, 2.5 & 3.0 3.65 1405 Tie concrete lining with rock
and counteract against uplift
pressure.
Intake Tower
Foundation
32 3 3.65 25 Improve safety factor
against buoyancy.
Diversion Tunnel
Upstream Portal side
Wall
32 2.5 4 3 Tie side wall with rock.
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ESTIMATED PULL OUT LOAD FOR ROCK ANCHORS
dia.(ds) Length (L) D = 3 x d Spacing (s)
(mm) (m) (mm) (m) Single Group
SPILLWAY Side Channe l Trough Y32 3.65 96 2.0 2948 514 1101 624 370 185
Transition Portion Y32 3.65 96 2.0 2948 514 1101 624 370 185
Chute Sta.0+52 to Sta.0+97 Y32 3.65 96 2.0 2948 514 1101 624 370 185
Y32 3.65 96 2.5 2948 643 1101 624 370 185
Chute Sta.0+97 to Sta.1+41 Y32 3.65 96 2.5 2948 643 1101 624 370 185
Flip Bucket Y32 3.65 96 2.0 2948 514 1101 624 370 185
Y32 3.65 96 3.0 2948 771 1101 624 370 185
Plunge Pool Y32 3.65 96 2.2 2948 566 1101 624 370 185
Y32 3.65 96 2.5 2948 643 1101 624 370 185
Y32 3.65 96 3.0 2948 771 1101 624 370 185
Subtotal: 1405
Spillway Bridge 16 Y25 2.50 75 2.0 947 241 589 427 370 185
INTAKE TOWER Foundation 25 Y32 3.65 96 3.0 2948 771 1101 624 370 185
MAIN DAM Toe Slab 1084 Y25 4.00 75 1.0 3880 309 942 534 226 113
U/S PORTAL Side Wall 3 Y32 4.00 96 2.5 3880 772 1206 684 370 185
Total: 2533
Ultimate Capacity of Anchors:Anchor Stability of rock
Single: P = L3 x g x p tan f where; g = 23 kN/m3
f = 40o
Group of Anchors : P = L2
x g . stan f where; g = 23 kN/m3
f = 40o
Bond between Cement Grout and Rock P = pDLt where; t = 1000 kPa (Little john ultimate bond stress for Sandstone)
Bond between Bar and Concrete P = p.ds x L x tb where; tb = 1.70 N/mm2
Yield failure of bar P = p/4.ds2
x 460MPa
Ultimate Pull Out Load , P (kN)
Cement grout
and rock
bar and
concrete
Yield failure
of bar
Anchor Stability of RockAllowable Pull out
Capacity with
( Fs = 2 ) kN
3
STRUCTURE PART OF STRUCTURE
ANCHOR BAR DETAILNo. of
Anchors
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INSTALLATION DETAILS
Diameter ofdrillhole
3 times dia of steelbar
Grout Mix
Cement W/c ratio
c/admix ratio
Admixture(for
expansion, reduce
bleeding, prevent
premature setting)
Mascrete fly-ash0.45
0.015
Intraplast by Sika
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PULL OUT TEST
ARRANGEMENT
500x500x25m
thk.m.s.PLATE30 TONS JACK
DIAL GAUGES
Y32 BAR STOP
END
200x400x25m
thk.m.s.PLATE
0.6000 0.6000
0.009
0.1300.150
BB
A
A
ANCHOR BAR
9mm m.s
STIFFERNER
2 NOS
305X165X44.6kg/m
FILLET WELD
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PULL OUT TEST
ARRANGEMENT
200x400x25mthk.m.s.PLATE SECTION B-B
65mmX65mm
m.s ANGLE
GROUND MOVEMENTREFRENCE MARKER M.S.ANGLE FRAME TO
SUPPORT DIA.GAUGES
SECTION A-A
FILLET WELD
TO BAR
ANCHOR BAR
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ROCK ANCHOR PULLOUT TEST
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ROCK ANCHOR PULLOUT TEST
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ROCK ANCHOR PULLOUT TEST
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ROCK ANCHOR PULLOUT TEST
Pressure Load
(psi) (ton) D1(Top) D2(Bottom) Difference 1 2 3 4 5 6 7 8 9 10 111 0 0 0.00 0.00 0.00 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
2 100 3.42 0.00 0.00 0.00 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
3 200 6.84 0.20 0.04 0.16 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
4 300 10.26 0.74 0.37 0.37 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
5 400 13.68 1.65 0.43 1.22 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
6 500 17.1 1.96 0.59 1.37 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598
7 600 20.52 2.29 0.80 1.49 51.396 51.398 51.403 51.402 50.378 51.485 51.480 51.479 51.480 50.602 50.598
8 700 23.94 2.50 1.05 1.45 51.397 51.398 51.403 51.403 50.378 51.485 51.480 51.479 51.480 50.602 50.5989 800 27.36 2.75 1.29 1.46 51.398 51.398 51.404 51.403 50.378 51.485 51.480 51.479 51.480 50.602 50.598
10 900 30.78 3.17 1.65 1.52 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598
11 1000 34.2 3.44 1.90 1.54 51.399 51.399 51.405 51.404 50.379 51.485 51.480 51.479 51.480 50.602 50.598
12 1100 37.62 3.89 2.29 1.60 51.399 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598
13 1100 37.62 3.89 2.29 1.60 51.399 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598
14 1000 34.2 3.76 2.19 1.57 51.400 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598
15 900 30.78 3.76 2.16 1.60 51.399 51.400 51.405 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598
16 800 27.36 3.69 2.12 1.57 51.399 51.400 51.404 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598
17 700 23.94 3.52 2.00 1.52 51.399 51.400 51.404 51.404 50.379 51.485 51.480 51.479 51.480 50.602 50.598
18 600 20.52 2.27 1.88 0.39 51.399 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598
19 500 17.1 2.07 1.62 0.45 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598
20 400 13.68 1.90 1.54 0.36 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598
21 300 10.26 1.57 1.20 0.37 51.398 51.399 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598
22 200 6.84 1.25 0.94 0.31 51.397 51.398 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598
23 100 3.42 1.03 0.77 0.26 51.397 51.398 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598
24 0 0 0.75 0.61 0.14 51.396 51.397 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598
Reference bench mark: EL + 50.500 m Back Sight : 1.182 m
LHS 4 RHS
1
Date : 10 October 2002
Dial Gauge Reading (mm) Reduced Level at Reference Points
Legend: Reference Level Points
TimeNo.
BERIS DAM PROJECT -SIK, KEDAH
SPILLWAY- ROCK ANCHOR INITIAL LOAD TEST
Location : CH151.50
9
6 7
5
3
2
8
1011
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ROCK ANCHOR PULLOUT TEST
BERIS DAM PROJECT
Spillway - Rock Anchor Pull Out Test No. 6
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
0 3.42 6.84 10.26 13.68 17.1 20.52 23.94 27.36 30.78 34.2 37.62 37.62
Tensile Load (Ton)
DialGaugeReading(mm
)
D1 (Top)
D2 (Bottom)