Faculty of Science and Engineering
| Advanced Geotechnical Engineering Dam Design Project – Marking Criteria |
| Marks | Marks |
| Overall report & submission | 05 |
| (i) Neat, clear, and well organized report with completed | |
| cover page (20%) | |
| (ii) All student should complete “Dam Design | |
| Project _Peer Assessment” (40%) | |
| (iii)Give the geometry of the earth dam cross section | |
| showing all dimensions (20%) | |
| (iv) Give a table to summarise properties of earth dam | |
| materials used in the design (20%) |
|
| SEEP/W analysis of the dam for steady-state seepage when | 15 |
| upstream water is at the service level (question 1 in the | |
| problem) | |
| (i) Provide co-ordinates of points used to model the dam | |
| geometry in SEEP/W (20%) | |
| (ii) Show FEM model to indicate different material | |
| regions and boundary conditions used (20%) | |
| (iii)Tabulate values of material properties used for each | |
| region and type of boundary conditions used to define | |
| the problem (provide any values applied to | |
| boundaries if applicable) (20%) | |
| (iv) After analysing, provide model dam (FEM model) to | |
| show the flux value in the flux section (20%) | |
| (v) Accurately calculate the total seepage loss in the | |
| reservoir per year in m3 (show all necessary | |
| calculations) (20%) |
|
| Using SEEP/W results, determination of the total head and | 5 |
| pore-water pressure at Points “A” and “B” under steady-state | |
| conditions with upstream water at the service level (question | |
| 2 in the problem) |
| (i) | Calculate the co-ordinates of points “A” and “B” |
| showing all necessary calculations (20%) | |
| (ii) | Obtain the most appropriate total head values at |
| Points “A” and “B” (40%) | |
| (iii) | Obtain the most appropriate pore-water values at |
| Points “A” and “B” (40%) |
|
| Verification of FEM (SEEP/W) results (question 3 in the | 20 |
| problem) | |
| (i) | Provide two flow nets chosen to show flow lines |
| and equipotential lines (10%) | |
| (ii) | For each flow net, clearly show how to calculate |
| the total seepage loss accurately using Darcy’s | |
| equation for 2D seepage (25%) | |
| (iii) | For each flow net, clearly show how to calculate |
| the total head at “A” and “B” accurately (25%) | |
| (iv) | For each flow net, clearly show how to calculate |
| pore-water pressure at “A” and “B” accurately | |
| using Bernoulli’s equation (25%) | |
| (v) | Compare SEEP/W values with calculated values |
| and provide three possible reasons for any | |
| deviation (15%) |
|
| Estimation of optimum saturated permeability for the core of | 5 |
| the dam (question 4 in the problem) | |
| (i) | Choose four appropriate saturated permeability |
| values for the dam core material (20%) | |
| (ii) | For each permeability value chosen for the dam |
| core, estimation of seepage loss per year in m3 per | |
| 1m length of dam using flux values in each | |
| SEEP/W analysis (40%) | |
| (iii) | Plot the seepage loss (m3/year/m) with the |
| saturated permeability coefficient of the dam core | |
| and determine the optimum saturated permeability | |
| value for the dam core material (40%) |
Faculty of Science and Engineering
| reservoir water is at the overtopping level(question 5 in the |
| problem) |
| (i) Give FEM model and indicate the change made boundary conditions of FEM model used in question 1 in the problem (20%) (ii) After analysing, provide model dam (FEM model) to show the flux value in the flux section (20%) (iii) Accurately calculate the total seepage loss in the reservoir per year in m3 (show all necessary calculations) (20%) (iv) Obtain the total head and pore-water pressure at point “A” and “B” from the results of seepage analysis using SEEP/W (20%) (v) Compare the total seepage loss, total head at A & B, and pore-water pressure at A & B when the reservoir water is at service level (question 1&2) and at overtopping level (question 5) and give reasons for differences (20%) |
| just after construction (question 6 in the problem) | |
| (i) | Give SLOPE/W model showing boundary |
| conditions, material zones (regions), entry and | |
| exit zones chosen for trial failure surfaces | |
| considered for both upstream and downstream | |
| slopes, tabulate material properties used for each | |
| region (20%) | |
| (ii) | Estimate the minimum FOS using Morgenstern |
| Price, Bishop’s simplified, Janbu’s simplified, | |
| Spencer, and Fellenious (Ordinary) methods for | |
| upstream and provide details (graphically) of |
Faculty of Science and Engineering
| method, compare the minimum FOSs obtained | |
| from different method and discuss the reasons for | |
| differences (40%) | |
| (iii) | Estimate the minimum FOS using Morgenstern |
| Price, Bishop’s simplified, Janbu’s simplified, | |
| Spencer, and Fellenious (Ordinary) methods for | |
| downstream and tabulate the values. Graphically | |
| show all the trial surfaces considered for | |
| Morgenstern-Price method and one with the | |
| minimum FOS (30%) | |
| (iv) | Provide three recommendations to increase the |
| FOS of dam slopes during/after construction | |
| (10%) |
|
| The long-term stability of downstream slope under steady- | 15 |
| state seepage (question 7 in the problem) | |
| (i) | Give SLOPE/W model showing boundary |
| conditions, material zones (regions), entry and | |
| exit zones chosen for trial failure surfaces | |
| considered for both service and overtopping water | |
| levels, tabulate material properties used for each | |
| region (20%) | |
| (ii) | For the service water level of the reservoir, |
| estimate the minimum FOS using Morgenstern | |
| Price, Bishop’s simplified, Janbu’s simplified, | |
| Spencer, and Fellenious (Ordinary) methods for | |
| downstream and provide details (graphically) of | |
| failure surface with minimum FOS for each | |
| method (30%) | |
| (iii) | For the overtopping water level of the reservoir, |
| estimate the minimum FOS using Morgenstern | |
| Price, Bishop’s simplified, Janbu’s simplified, | |
| Spencer, and Fellenious (Ordinary) methods for |
Faculty of Science and Engineering
| show all the trial surfaces considered for | |
| Morgenstern-Price method and one with the | |
| minimum FOS (40%) | |
| (iv) | Provide three recommendations to increase the |
| FOS of downstream of the dam under steady-state | |
| seepage conditions (20%) |
|
| The stability of upstream slope during/after sudden | 10 |
| drawdown of reservoir water level (question 8 in the | |
| problem) | |
| (i) | Give SLOPE/W model showing boundary |
| conditions, material zones (regions), entry and | |
| exit zones chosen for trial failure surfaces | |
| considered upstream slope stability for sudden | |
| drawdown, tabulate material properties used for | |
| each region (20%) | |
| (ii) | Selection of four drawdown levels, estimate |
| minimum FOS for each drawdown level using | |
| Morgenstern-Price method, provide details | |
| (graphically) of the failure surface with minimum | |
| FOS for each drawdown level (40%) | |
| (iii) | For each drawdown level, graphically (plotting a |
| graph) show how the FOS change over 30 days | |
| after sudden drawdown (20%) | |
| (iv) | Plot a graph between minimum FOS and |
| drawdown levels determine the safest drawdown | |
| level (20%) | |
| Total | 100 |
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