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Group 5: Benchmarks compared with other programs
5.1 Comparison with SLIQ2D (
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DOS and Windows) - One fully saturated layer with variable slope angle
Description
The benchmarks in this paragraph are intended to verify the advanced method by comparing D-FLOW SLIDE results with those from the older program SLIQ-2D SLIQ2D, using both DOS and Windows versions of this program.
Because of the limitations in the DOS version of SLIQ2D, only one fully saturated layer is inputted. The geometry and the material properties for each cases are given in the table below.
The original slope angle is 1:1.25 and is set to "variable" so that the program will search (for each point) for the most unfavorable slope.
Benchmark name | Original file name (SLIQ2D-DOS) | Soil type | Slope height (m) | Slope angle | n (%) | n min (%) | n max (%) | Eps voldm0 | m | r | s 2 | s max | v | k so (kN/m 2) | u | Unit weight (kN/m 3) | D r (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
bm5-1a | LGZM1 | Sand clay | 21.9 | 1:1.25 | 45.5 | 50 | 35 | 0.0025 | 1.7 | 7 | 1.28 | 1.7 | 1 | 50000 | 1 | 8.856 | 30 |
bm5-1b | LGZM2 | Sand clay | 21.9 | 1:1.25 | 45.5 | 50 | 35 | 0.0035 | 1.7 | 7 | 1.28 | 1.7 | 1 | 50000 | 1 | 8.856 | 30 |
bm5-1c | LGZM3 | Sand clay | 21.9 | 1:1.25 | 45.5 | 50 | 35 | 0.005 | 1.7 | 7 | 1.28 | 1.7 | 1 | 50000 | 1 | 8.856 | 30 |
bm5-1d | LGZM4 | Sand clay | 21.9 | 1:1.25 | 45.5 | 50 | 35 | 0.006 | 1.7 | 7 | 1.28 | 1.7 | 1 | 50000 | 1 | 8.856 | 30 |
bm5-1e | SIMPLETA | Sea sand | 10 | 1:1.25 | 47.4 | 50 | 37 | 0.0092 | 3 | 7 | 1.23 | 1.35 | 1 | 39460 | 1.33 | 8.547 | 20 |
bm5-1f | LG1D5N5H | Sand clay | 20.9 | 1:1.25 | 40.2 | 50 | 35 | 0.0022 | 1.7 | 7 | 1.18 | 1.4 | 1 | 85000 | 1 | 9.717 | 65.333 |
bm5-1g | HBPZBUI3 | Sea sand | 22 | 1:1.25 | 45.5 | 50 | 35 | 0.0054 | 2 | 7 | 1.25 | 1.4 | 1.25 | 50000 | 1 | 8.856 | 30 |
Benchmark results
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Number of unstable points per slope angle
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In SLIQ2D-Windows only the value of the tangent angle is available in the output. The other parameters (such as Lambda, Ko, the normal stress p and the deviatoric stress q) are not saved and can only be red on the screen, making the comparison difficult.
The automatical Nota also that the automatic generation of the variable values of the slope angle used by SLIQ2D-DOS is not exactly the same as in SLIQ2D-Windows or D-FLOW SLIDE (which use 2 extra slopes compared to SLIQ2D-DOS: 1:1.4 and 1:1.3).
Benchmark 5-1a - Number of unstable points per slope angle, for the 3 programs
D-FLOW SLIDE results
Maximum relative error between SLIQ2D-DOS and D-FLOW SLIDE
Case | Slope angle at which instability occurs (Tan Alpha) | Tan Alpha_p | Ko_p | Normal stress p | Deviatoric stress q | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
bm5-1a | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | |||||||||
bm5-1b | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | |||||||||
bm5-1c | ||||||||||||||
Slope angle | Slope inclinaison | Nb. unstable points | Nb. unstable points | Nb. unstable points | Relative error between | Relative error between | ||||||||
( - ) | ( - ) | ( - ) | ( - ) | ( - ) | ( % ) | ( % ) | ||||||||
<0.143 | <7 | 0 | 0 | 0 | 0.00 | 0.00 54 | 0.143 | 7 | 1 | 1 | 1 | 13 | 0.00 | 0.00 |
bm5-1d | 0.154 00 | 6.5 | 2 | 2 | 2 0.00 | 0.00 | 0.00 | 0.167 | 6 | 3 | 3 | 00 | ||
bm5-1e | 3 | 0.00 | 0.00 | 0.182 | 5.5 | 7 | 7 | 7 | 00 | 0.00 | 0.00 | 0.2 | 5 | 15 |
15 | 15 bm5-1f | 0.00 | 0.00 | |||||||||||
0.211 | 4.75 | 6 | 6 | 6 | 0.00 | 0.00 | ||||||||
0.222 | 4.5 | 15 | 15 | 15 | 0.00 | 0.00 | ||||||||
0.235 | 4.25 | 17 | 17 | 17 | 0.00 | 0.00 | ||||||||
0.25 | 4 | 19 | 19 | 19 | 0.00 | 0.00 | ||||||||
0.267 | 3.75 | 23 | 23 | 23 | 0.00 | 0.00 | ||||||||
0.286 | 3.5 | 25 | 25 | 25 | 0.00 | 0.00 | ||||||||
0.308 | 3.25 | 24 | 24 | 24 | 0.00 | 0.00 | ||||||||
0.333 | 3 | 40 | 40 | 40 | 0.00 | 0.00 | ||||||||
0.364 | 2.75 | 24 | 24 | 24 | 0.00 | 0.00 | ||||||||
0.4 | 2.5 | 26 | 26 | 26 | 0.00 | 0.00 | ||||||||
0.444 | 2.25 | 23 | 23 | 23 | 0.00 | 0.00 | ||||||||
0.5 | 2 | 14 | 14 | 14 | 0.00 | 0.00 | ||||||||
0.571 | 1.75 | 9 | 9 | 9 | 0.00 | 0.00 | ||||||||
0.667 | 1.5 | 3 | 3 | 3 | 0.00 | 0.00 | ||||||||
0.714 | 1.4 | 0 | 1 | 1 |
| 0.00 |
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Comparison between SLIQ2D-Windows and D-FLOW SLIDE
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Results between SLIQ2D-Windows and D-FLOW SLIDE are exactly the same for the tangent angle, as show in the table below.
Table 5-2: Maximum relative error between SLIQ2D-Windows and D-FLOW SLIDE for the tangent angle
Case | Tan Alpha | ||||
|---|---|---|---|---|---|
bm5-1a | 0.00 % | ||||
bm5-1b | 0.00 % | 0.00 bm5-1c | 0.00 % | ||
bm5-1d 1g | 0.00 % | 0.00 bm5-1e | 0.00 % bm5-1f | 0.00 % bm5-1g | 0.00 % |
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Results between SLIQ2D-
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Windows and D-FLOW SLIDE are exactly the same for the tangent angle, as show in the table below.
Table 5-2: Maximum relative error between SLIQ2D-DOS Windows and D-FLOW SLIDE for different parametersthe tangent angle
Case | Tan Alpha |
|---|---|
bm5-1a | 0.00 % |
bm5-1b | 0.00 % |
bm5-1c | 0.00 % |
bm5-1d | 0.00 % |
bm5-1e | 0.00 % |
bm5-1f | 0.00 % |
bm5-1g | 0.00 % |
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