Critical Review on Stress-Sensitivity and Other Behavioral Aspects of Arch Dams

Panicker, K. Jiji; Nagarajan, Praveen; Thampi, Santosh G.

doi:10.1007/978-981-15-5644-9_42

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…For concrete dams, overstressing is the dominant factor leading to cracks, and it is also an important indicator affecting dam safety and overall stability [9][10][11][12][13]. Therefore, stress is commonly considered as a control indicator in design.…”

Section: Introductionmentioning

confidence: 99%

Stress Prediction Model of Super-High Arch Dams during Their Initial Operation Stages

Cheng,

Han,

2024

Water

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It is of great significance to identify the spatiotemporal stress distribution characteristics to ensure the safety of a super-high arch dam during the initial operation stage. Taking the 285.5 m-high Xiluodu Dam as an example, the spatiotemporal distribution characteristics were analyzed based on the five-year observation data after impoundment. Statistical and boosted-regression-tree-based prediction models for the dam stress were established. The boosted-regression-tree-based prediction model is more accurate than the statistical model. The monitoring indicators for the measuring points of focused locations were determined using the confidence interval estimation method. The results show that the dam was in a compression state, and the arching effect was obvious. The arch direction compressive stress gradually increased and stabilized, and the maximum appeared in the middle of the upstream face of the crown cantilever monolith. For the crown cantilever, the cantilever direction stress at the dam heel was significantly affected by the interior temperature recovery, and the arch direction stress in the middle of the upstream face was significantly affected by the reservoir water level. The measuring points of the focused locations with reliable observation data can be selected as a monitoring index to guide the initial operation.

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Section: Introductionmentioning

confidence: 99%

Stress Prediction Model of Super-High Arch Dams during Their Initial Operation Stages

Cheng,

Han,

2024

Water

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Safety considerations, failure scenarios and various factors affecting the behaviour and performance of concrete arch dams

Panicker K,

Nagarajan,

Thampi

2024

E3S Web of Conf.

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Dams which were primarily used for irrigation and water supply in ancient days makes their presence inevitable through their important roles in other arenas such as flood control, hydropower development, navigation, sediment control and water quality etc., as well. The overall basin development depends largely on various dams constructed at various salient location. To the world population –presently at 8 billion- the demand for water which is growing at 2 to 3% annually will be a concern and dams render a helping hand in that perspective. Concrete dams plays a prominent role. The failures of concrete gravity and arch dams are rare compared to other types. Comprehensive studies on dams attributed the failure modes to overtopping, foundation problems, piping, sliding, structural failure, inadequate spillways, earthquake motions and faults in operations etc. Thermal loading is a concern when there are large variations in temperature. Earthquakes can become a cause of failure of dams depending upon salient characteristics of the event, quality of the rock constituting the foundation strata, material of the dam and the design criteria adopted. The design methodologies have undergone commendable changes from the linear-elastic static analyses to dynamic analyses and the design techniques are capable of incorporating non-linearity and also for simulating the near real scenario. The pseudo-static seismic methods gave way to dynamic seismic simulations using the time histories of the seismic activities already occurred with the help of various mathematical models and refined software. Concrete dams are no exception in failures, if they are not implemented and monitored as per the latest guidelines of national and international standards. Apart from seismicity, there are various factors influencing the behaviour and safety of dams. Concrete arch dams are often constructed to impound very large volume. Adoption of state of the art analyses techniques, design as per latest guidelines, studying the performance and behaviour, safety evaluation and continuous dam health monitoring are essential to avert any potential hazard to these invaluable resources. This paper reviews extensively, the various considerations towards the design, behaviour, performance and the failure scenarios of concrete arch dams.

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Critical Review on Stress-Sensitivity and Other Behavioral Aspects of Arch Dams

Cited by 2 publications

References 6 publications

Stress Prediction Model of Super-High Arch Dams during Their Initial Operation Stages

Stress Prediction Model of Super-High Arch Dams during Their Initial Operation Stages

Safety considerations, failure scenarios and various factors affecting the behaviour and performance of concrete arch dams

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