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The critical condition for stability of slope of an earth dam at down stream will be
- a)Reservoir empty with max. seepage
- b)Reservoir full without pore water pressure
- c)Reservoir full with max. percolation rate
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
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The critical condition for stability of slope of an earth dam at down ...
Explanation:
Critical condition for stability of slope of an earth dam at downstream:
- The critical condition for stability of the slope of an earth dam at the downstream side occurs when the reservoir is full with the maximum percolation rate.
Reasoning:
- When the reservoir is full, the water pressure against the downstream face of the dam is at its highest level.
- If the percolation rate is also at its maximum, it means that water is flowing through the dam structure at a high rate.
- This combination of high water pressure and high percolation rate can lead to an increase in pore water pressure within the dam, reducing the effective stress and potentially causing instability.
Importance of considering maximum percolation rate:
- The maximum percolation rate is a critical factor because it directly affects the rate at which water flows through the dam structure.
- High percolation rates can lead to increased pore water pressures, reducing the effective stress within the dam and potentially leading to slope failure.
Conclusion:
- In conclusion, the critical condition for stability of the slope of an earth dam at the downstream side occurs when the reservoir is full with the maximum percolation rate. It is important to consider this condition when designing and monitoring the stability of earth dams to prevent potential failures.
Critical condition for stability of slope of an earth dam at downstream:
- The critical condition for stability of the slope of an earth dam at the downstream side occurs when the reservoir is full with the maximum percolation rate.
Reasoning:
- When the reservoir is full, the water pressure against the downstream face of the dam is at its highest level.
- If the percolation rate is also at its maximum, it means that water is flowing through the dam structure at a high rate.
- This combination of high water pressure and high percolation rate can lead to an increase in pore water pressure within the dam, reducing the effective stress and potentially causing instability.
Importance of considering maximum percolation rate:
- The maximum percolation rate is a critical factor because it directly affects the rate at which water flows through the dam structure.
- High percolation rates can lead to increased pore water pressures, reducing the effective stress within the dam and potentially leading to slope failure.
Conclusion:
- In conclusion, the critical condition for stability of the slope of an earth dam at the downstream side occurs when the reservoir is full with the maximum percolation rate. It is important to consider this condition when designing and monitoring the stability of earth dams to prevent potential failures.
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The critical condition for stability of slope of an earth dam at down ...
Failure of an embankment dam can result from instability either the upstream or downstream slopes. The failure surface may lie within the embankment or may pass through the embankment and foundation soil.
The critical stages in an upstream slope are:
The critical stages in an upstream slope are:
- At the end of construction
- During Sudden or rapid drawdown
The critical stages in a downstream slope are:
- At the end of construction
- During steady seepage when reservoir is full.
To ensure stability, the various conditions must be investigated:
- The slopes must be safe against surface slipping. To ensure this the slopes must be no steeper than the angle of repose.
- The dam must be safe against sliding on the foundation.
- The mass of the embankment must be safe against circular arc failure or composite line failure. This is likely to occur within the earth core or weak foundation.
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