Earthfill Dam Design and Analysis

Jansen, Robert B.; Kramer, Richard W.; Lowe, John; Poulos, Steve J.

doi:10.1007/978-1-4613-0857-7_9

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Some authors only include general information. Jansen [28] mentions that for earth dams the time to renovation is from 8 (Walter Bouldin Dam) to 85 years (Willow Creek Dam). According to Kledyński [29],…”

Section: Uncertainty Of the Mttfmentioning

confidence: 99%

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Mean time to failure of dams

Opyrchał

Bąk

2023

Preprint

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Dams are among the largest structures constructed by human. Their disasters result in numerous casualties and large material losses. The statistical analysis of the reasons for dam disasters was carried out by the International Commission on Large Dams. The hazard function h(t) and next, the reliability function R(t) were calculated based on that data, using the fitting of the power function in the infant mortality period and a constant function in the operation period. The knowledge of the reliability function allowed for calculating the mean time to failure which was 112957 ± 12443 years. It was also demonstrated that in the operation period the annual dam failure ratio is 8.719×10− 6 ± 0.297×10− 6. It is a value that is proximate to the recommendations of the U.S. Army Corps of Engineers which suggests the tolerance for the annual dam disaster risk not to exceed 10− 6 for newly-constructed dams and 10− 4 for already existing ones.

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Section: Uncertainty Of the Mttfmentioning

confidence: 99%

“…In order to calculate extended uncertainty (28), k = 2 was adopted, which corresponds to the confidence level 0.95 (Brand 1970) [36].…”

Section: = 12443 Yearsmentioning

confidence: 99%

Mean time to failure of dams

Opyrchał

Bąk

2023

Preprint

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“…In general, earthfill dams are designed using various material composition by considering particular site condition. Optimally integrated local materials are commonly utilized to construct earthfill dams [1]. Commonly, the main part of earthfill dam is made of rockfill material [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size Distribution on Shear Strength Characteristic of Random Fill Material at Keureuto Dam, Indonesia

Hakim,

Kamaruddin,

Sahadewa

et al. 2023

KEM

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Earth-fill dams are commonly constructed by composing different geomaterials to optimally utilize local natural resources. In Indonesia, random fill materials are frequently used as a major composition in dam construction. The term random fill material originated from its broad range of grain size. Grain size distribution influences shear strength characteristics of geomaterials. There are 2 shear strength equations to model the behavior of fill material, i.e., linear Mohr-Coulomb and non-linear power curve. Two series of large scale in situ direct shear tests were performed at Keureuto Dam, Indonesia. Sieve analysis tests were performed accordingly. The random fill material was composed of cobbles, gravel, and less than 25% of sand. The stress-displacement characteristics of random fill material indicated that plastic deformation occurred at shear strain of 1% to 4%. The shear failure was reached in shear displacements of 60 – 90 mm, equivalent to shear strain of 8% – 12 %. Stress-strain relationships showed a dilative behavior indicating the random fill was in a relatively dense form. The dilatancy tends to decrease as the normal stress increases. The linear Mohr-Coulomb failure criteria and non-linear power curve equation are suggested to characterize the shear strength of the random fill material. To obtain a realistic value of the non-cohesive strength parameter of granular material, the Mohr-Coulomb approach should be intercepted at zero. A relationship between secant friction angles for different normal stresses is presented. This angle tends to decrease at higher normal stresses.

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“…Seepage flow with a free surface is usually analyzed on the basis of a fixed finite element mesh as originally proposed by Neuman (NEUMAN, 1973), because in contrast to adaptive mesh methods, unfavourable distortions of finite elements are avoided. On the basis of the fixed mesh method, different numeric techniques have been proposed, such as the variable permeability method (BATHE et al, 1979), the residual flow method (DESAI & LI, 1983), the initial flow method (ZHANG et al, 1988), the virtual flux method (VFM) (ZHU & SU, 1991; ZHU, 1997), the variational inequality method (JANSEN et al, 1988), the refined Gauss point method (WANG & HUANG, 1997), the variational inequality method (ZHENG et al, 2005b) and related methods (SHU et al, 2007;ALT, 1980;WANG, 1998;ZHENG et al, 2005a;BORJA & KISHNANI, 1991;GABRIELLA et al, 2016;AZUSA et al, 2018). However, for determining the free surface with higher accuracy, most of the aforementioned numerical methods require a very fine discretization, especially in the vicinity of the free surface, which is computationally expensive for 3D problems in engineering practice.…”

Section: Introductionmentioning

confidence: 99%

A new numerical method for the analysis of monolithic seepage problems with complex drainage systems in a groundwater recharge area for a hydropower station in China

et al. 2019

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After construction of a dam impounding water in a reservoir, a monolithic seepage field develops in the surrounding rock mass. Here, a new finite element method is proposed for determining the shape and characteristics of the 3D monolithic seepage field including the free surface, considering complex drainage systems consisting of densely-spaced drainage holes and drainage galleries. To this end, the previously proposed virtual flux method is improved by a refined numerical integration scheme and a regularized Heaviside function for distinguishing the subregions below and above the free surface within a particular finite element. Leakage and overflow drainage holes are modeled as internal boundaries. The proposed numerical method is verified by an academic example, for which the analytical solution is available. Finally, the numerical simulation of the seepage field developing in the vicinity of a high dam and underground power house, constructed in the context of a hydropower plant project in China is used to show its application to a problem in engineering practice.

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Earthfill Dam Design and Analysis

Cited by 8 publications

References 22 publications

Mean time to failure of dams

Mean time to failure of dams

Effect of Grain Size Distribution on Shear Strength Characteristic of Random Fill Material at Keureuto Dam, Indonesia

A new numerical method for the analysis of monolithic seepage problems with complex drainage systems in a groundwater recharge area for a hydropower station in China

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