Which is ideal condition for dam construction?
� The site should be as sound as possible: strong, impermeable and stable. � Strong rocks at the site make the job of the designer much easy: he can evolve best deigns. � Impermeable sites ensure better storage inventories.
What are the types of arch dams?
There are four types of arch dams i.e. constant radius arch dam, variable radius arch dam, constant angle arch dam, double curvature arch dam. An arch dam is curve shaped solid wall which is generally built with cement concrete.
What are the criteria of site selection for each types of dam?
Following are the factors affecting selection of dam site by dam type.
- Topography.
- Geology and Foundation Conditions.
- Availability of materials.
- Spillway size and location.
- Earthquake zone.
- Height of the Dam.
- Other factors such as cost of construction and maintenance, life of dam, aesthetics etc.
Which shaped valley is suitable for construction of arch dam?
Explanation: The choice of an arch dam is suggested for a narrow V-shaped valley. A separate site for the spillway must also be available and it is generally preferred to have the top width of the valley less than 1/4 of its height. 3. Which of the following foundations are suitable for earthen and rock-fill dams?
Is code for check dam design?
The check dam structure design in limit state method. Design should be followed by the rules of indian standard IS 6966-1973.
Is code design of gravity dam?
The dam shall be safe against overturning at any plane within the dam, at the base, or at any plane below the base; and The safe unit stresses in the concrete or masonry of the dam or in the foundation material shall not be exceeded.
How are concrete arch dams evaluated for safety?
Existing concrete arch dams should be evaluated by conducting a review and analysis of all existing data, a field inspection, and any analyses necessary to determine the safety of the dam for continued normal operation and resistance against the unusual and extreme loading conditions. 11-1.4.1 Review of Existing Data and Site Inspection
Is the FERC guidance applicable to arch dams?
This guidance is applicable to FERC engineers and licensees engaged in the safety evalu- ation of existing arch dams. The design of new arch dams should follow the guidance and criteria of the references (USBR, 1977 and COE, 1994) , but could also benefit from the evaluationphilosophy presented in this chapter.
Can a rock foundation support an arch dam?
However, arch dams with relatively flat abutment slopes, or arch dams with abut- ment thrust blocks supported by rock foundations with inadequate shear strength could be susceptible to sliding along the foundation contact and should be considered. 11-3
What happens when an arch dam is overstressed?
Overstressing of concrete arch dams may exhibit a tendency toward developing a partial failure, if large tensile stresses from the linear-elastic analysis indicate extensive joint opening and cracking .