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IMPACT/WP 2 Stability and Failure Mechanisms of Dams
A dam safety research projectKjetil Arne Vaskinn
Large scale field-tests 2002
Test Dato Type of dam Objectives of the tests1-02 2002-09-
11 and 12
Homogenous clay Breaching mechanisms in a dam made by cohesive material
2A-02 2002-10-01 og 02
Homogenous gravel dam. Rock fill on downstream slope
Stability with flow through and over the dam
2B 2002-10-08 og 10
Homogenous gravel dam
Stability with flow through the dam
2C 2002-10-15 og 16
Homogenous gravel dam
Breaching mechanisms
3-02 2003. Rockfill dam with moraine core
Breaching mechanisms in a composite dam
4-02 2002-10-24 og 25
Homogenous rockfill 300-400mm
Stability with flow through the dam
Large scale field-tests 2003
Test Dato Type of dam Objectives of the tests1A-03 2003-07-28 –
2003-08-15 Rockfill dam with moraine core
Resistivity and SP investigation for initial dam breach studies and internal erosion detection
1B-03 2003-08-19 - 2003-08-22
Rockfill dam with moraine core
Breaching mechanisms in a rockfill dam with moraine core
2 2003-09-15 – 2003-09-19
Rockfill dam with moraine core
Breaching by internal erosion/piping
3 2003-10-07 – 2003-10-08
Homogenous moraine dam
Breaching by internal erosion/piping
Rockfill dam with moraine core – breaching by overtopping.
Rock filling:.A: 0-500 mm, d10 > 10 mm in downstream fillingB: 300-400 mm in upstream filling
1 meter layer, 4 ton roller compactor. 2 layer with 2 pore pressur sensors in the core, 3 on the foundation of the downstream supporting fill
Test 1B-2003
H=6m1
1,5
B = 2,5m
1
4
H=5,5m
B = 1m
AB
Fjell Water proof sealing
Concrete sill with V-notch weir
Rockfill dam with moraine core – breaching by piping/internal erosion. Identical with 1-2003
Test 2-2003
H=6,5m
1
1,51
4
H=6,5m
200 mm halfpipe with slots on top in sand layer
Concrete sill with V-notch weir
200 mm halfpipe with slots on top. Sand all the way to the top