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The principal destabilizing (or overturning) force that acts on a gravity dam is the water pressure that is exerted on the upstream face of the dam.
What kinds of forces are at work within the gravity dam?
Forces from the Outside Operating on the Gravity Dam. Pressure of the Water Uplift Pressure. The Forces of an Earthquake
What is causing the dam to overturn?
Overturning Failure of a Gravity Dam: If the resultant of all the forces operating on a dam at any of its sections passes through the toe of the dam, then the dam will rotate and topple about the toe. This type of gravity dam failure is known as an overtopping failure.
What is the primary role that gravity plays in maintaining the dam’s stability?
The principal stabilizing force of a gravity dam is the dam’s own self-weight. The principal force that contributes to the instability of a gravity dam is the water pressure on the upstream side (Figure 29.2). It’s possible that the downstream side has pressure, too.
What exactly does it mean to have a gravity dam?
A gravity dam is a dam that is designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. A gravity dam can be constructed out of stone masonry or concrete, and it can be designed to hold back water.
Dam Breakage as a Result As a Result of Turning Over / Overturning Dam Break at the Gravity Dam
Found 36 questions connected to this topic.
What is the significance of the name “gravity dam”?
Concrete, masonry, or both are typically used in the construction of a gravity dam. This type of dam is known as a gravity dam because the force of gravity keeps it anchored to the earth, preventing the water in the reservoir from pushing it over.
How do gravity dams work?
The base of a concrete gravity dam is typically significantly wider than the crest, giving the dam its characteristic triangle cross section. If the face of the dam that faces upstream is sloped, then a portion of the water force will push downward on the dam, which will contribute favorably to the structural integrity of the dam.
Which of the following forces contributes to enhancing the gravity dam’s level of stability the most?
The shear strength at the base and at other joints is increased by stepping the foundation at the base, and additional precautions are taken to create a better bond between the dam and the rock foundation. The shear strength of these joints should be improved to the greatest extent possible by strengthening the link that exists between the two surfaces.
How do you determine whether or not a gravity dam is stable?
- Technique Based on Gravity Two-dimensional approaches are another name for this method of stability analysis, which is also known as this method. …
- Way of Twisting the Trial Load:…
- Slab Analogy Method: …
- Method of the Lattice Analogy… Experimentation Methods…
What is the strength of the horizontal force that destabilizes?
At a storage reservoir with a fetch of 52 kilometers and a wind speed of 172 kilometers per hour, what is the value of the horizontal destabilizing force caused by the production of waves? What is the value of this force? Pw = 19.62 x 3.022 = 179.69 KN. 7.
Under what circumstances does the dam no longer pose a threat of collapse?
When a dead load, live load, and earth pressures are evaluated together with a wind load or seismic forces, the factor of safety for shallow foundations against overturning shall not be less than 1.5. The factor of safety must be at least 2 when only dead load, live load, and earth pressures are taken into consideration.
What is the safety component that prevents the object from rolling over?
The minimal value for the factor of safety against overturning should be 1.50, and the factor of safety itself is defined as the resisting moment divided by the overturning moment.
With a dam, what exactly is the uplift force?
The foundation itself, as well as the concrete structure itself, are both actively contributing to the uplift of the structure. This pressure can be found in the cracks, pores, and joints of the concrete that makes up a dam, as well as in the interface between the dam and the foundation, as well as in the cracks, pores, and seams that are found in the rock that makes up the foundation.
What are the various parts that make up a gravity dam?
- Heel.
- Crest.
- Wall with a parapet.
- Toe.
- Abutment.
- Conduit.
- Cutoff.
- Galleries.
Which one of these forces does not have an effect on the dam?
9. Which of the following does not belong to the list of forces that act on the dam? The dam is not affected by the creep pressure, which is one of the other forces described above. The majority of the forces that will be operating on a gravity dam will be acting in a horizontal direction. These forces include water pressure, wave pressure, wind pressure, ice pressure, and others.
Which of the following is the most essential component of gravity dams?
- Topography. Topography dictates the first choice of the type of dam. …
- Geological and Foundation Conditions. …
- Availability of Materials. …
- Spillway Size and Location. …
- Earthquake Zone. …
- Height of Dam.
What exactly is meant by “stability analysis”?
1. The component of systems and control theory that is used to investigate and predict the features of a system’s stability or instability based on a knowledge of the mathematical model of the system.
In the event of a gravity dam, what exactly is the middle third rule?
According to the middle-third rule, which may be found in the field of civil engineering, there will be no development of tension in a wall or foundation if the resultant force is located within the middle third of the structure. This rule can only be applied to foundations that have a square or rectangular floor plan in order for it to be valid.
What are some of the assumptions that are used while designing a gravity dam in two dimensions?
The two-dimensional gravity method operates under the following set of assumptions: 1) the dam is thought to be made up of a number of cantilevers, each of which is 1 m thick and acts independently of the other; 2) no loads are transferred to the abutments by beam action; 3) the foundation and the dam act as if they were a single unit; 4) the…
What roles does the gallery play within the structure of a gravity dam?
It is a gallery that allows access to the interior of the mass that makes up the dam. This access is provided so that the structure can be inspected and the structural behavior of the dam throughout its post-construction era may be studied. In addition to that, it serves as an inspection gallery in addition to catering to the drainage, gate, and grouting galleries.
Which of the following forces should be considered the least significant when designing arch dams?
1. Which of the following forces is the least significant in the planning and construction of arch dams? Explanation: In an arch dam, the uplift pressure is typically disregarded due to the fact that it is relatively low as a result of the limited base width of its body.
What are some of the drawbacks of using a gravity dam?
- Their construction initially comes with a hefty price tag.
- Their duration while building is proportionately longer.
- These things require a solid and sturdy base to stand on.
- After they have been built, dams cannot have their height increased.
- Skilled manpower is essential for the oversight of concrete dam construction projects.
Which dam in the world has the distinction of being the highest gravity dam?
The dam with the greatest elevation in the world
At a height of 285 meters, the Grande-Dixence dam holds the title of the world’s highest gravity dam.
How exactly does an arch dam prevent water from leaking through?
These concrete and masonry constructions, which are known as arch dams, are resistant to the force of water pressure not just by depending on gravity, but also by transferring water pressure from side to side…. If canyon walls are utilized to assist in the containment of a reservoir, the dam that is used to create the reservoir does not have to be designed to handle all of the pressure.
Which Indian dam has the highest gravity wall height?
The Bhakra-Nangal Dam, which sits on the boundary between the states of Punjab and Himachal Pradesh, is the second-tallest dam in all of Asia. It has a length of 168.35 kilometers and a height of approximately 207.26 meters, making it the longest and highest straight gravity dam in India.