Estimation of the reliability of a high earth-rock dam

Rasskazov, L. N.; Zhelankin, V. G.

doi:10.1007/bf01425064

Cited by 3 publications

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“…To overcome the indicated difficulties, the method of linearization using a Taylor series expansion of the index of the state as a function of the acting factors is sometimes used [2,7,8]. The expected value M and dispersion D of the index of the state V i can be determined on the basis of such an expansion under certain additional assumptions.…”

Section: (1)mentioning

confidence: 99%

Engineering method of calculating the reliability of hydraulic structures

Ivashchenko¹,

Yancher²

1988

Hydrotechnical Construction

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The introduction of the methodology of reliability theory into the practice of designing, constructing, and operating hydraulic structures makes it possible to more well-foundedly solve problems of optimization of engineering decision being made. In this case, the quantitative indices of reliability, along with cost and technological factors, perform the role of optimization criteria. The considerable labor intensity of probabilistic calculations prevents their wide use. We will examine some techniques of simplifying the method of calculating reliability.The random variability of the characteristics of effects, materials, foundation rocks, as well as of the parameters of the initial state and construction and operating conditions determine the nonzero numerical value of the probability of failure P (or damage) of structures during a fixed time (for example, during a year or period of operation T). The probability of no-failure operation (i -P) is taken as the index of reliability [i, 2, 1.0].The probabilistic nature of the occurrence of limit states of hydraulic structures is taken into account by design standards when designating the probability of the design characteristics of effects and properties [3~ However, the deterministic form of such consideration leads to the necessity of regulating the limited number of design cases related to individual types of limit states and determining the combination and level of design effects and characteristics of the properties. As a consequence of this, noneconomical or extremely risky design decisions are possible. The indicated shortcomings are eliminated, as is known [i, 2, 7-10], by using a single index of the state of the structure -the probability of its no-failure (reliable) operation R.

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Section: (1)mentioning

confidence: 99%

Engineering method of calculating the reliability of hydraulic structures

Ivashchenko¹,

Yancher²

1988

Hydrotechnical Construction

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?Optimization of earth-dam structures? and the potential of numerical methods

Belyakov¹,

Sysoev²

1990

Hydrotechnical Construction

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From the Editorial Office:The attention of the paper's readers is called to analysis of the reliability of the results of computer-aided calculations of earth dams from mathematical models. Undisputably, mathematical modeling can be a powerful and reliable means of assessing the serviceability of a structure and ways to improve it; it cannot replace design, however, and as is demonstrated in this paper, the weak sides of mathematical models must also be soberly considered. The authors rightly focus attention on the need for reliable determination of the characteristics and properties of soils placed in the body of a dam, without which a valid result could not be obtained when using even the most complete body of mathematics. Also deserving mention is the analysis of other factors affecting the degree of reliability of computational results. The paper "Optimization of earth-dam structures" [i] is a further development of already several years of evolving ideas and methods of "optimization" [2,3], which assume a selection of "variable factors" (structural -the width and angle of incline of the core, the contour intervals of the slopes, and, technologica I -the density of soil placement, etc.) and their computed values ("levels"), the conditional formalization of factors and the selection of a group of computed variants of the dam profile ("computation plans," or "design matrix"). The cost and "critera of structure reliability," as well as their functional dependencies on variable factors are determined for these variants. The "optimal" variant is then sought proceeding from simultaneous fulfillment of conditions of the maximum reliability function and minimality of the cost function.Without touching upon the methods used to determine the cost indicators of the variants, note that the "reliability criteria," i.e., safety factors for stability, crack resistance, etc., are determined from the results of computatioDs of the stress-strain state [3, p. 32] using the software DAM-2M (the problem of plane deformation in accordance with the method of local variations (MLV), which is based on the "energy" soil model [2,4]. Rasskazov and Sepeda [i] fail to mention these "optimization" fundamentals, however, and the solution of the optimization problem is reduced to some formalized operations with values of the reliability criteria and cost indicators. It is therefore timely and expedient to return to these fundamentals and discuss them on the pages of this journal.i. Optimization of earth-dam structures during their design and construction, which is based on the use of numerical methods of calculating the stress-strain state (SSS), is an extremely urgent problem and promises economic benefits, raising the competitiveness of earth dams in connection with the pronounced cost increase for the construction of concrete dams formed from low-cement concrete.Firstly, however, the problem of optimization in dam-construction practice actually reduces to the search for the possibility of maximum utilization of soils found in the imme...

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Experimental Substantiation of Internal Strength Parameters of L. N. Rasskazov’s ≪Energy≫ Soil Model

Bestuzheva

2024

Soil Mech Found Eng

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Estimation of the reliability of a high earth-rock dam

Cited by 3 publications

References 3 publications

Engineering method of calculating the reliability of hydraulic structures

Engineering method of calculating the reliability of hydraulic structures

?Optimization of earth-dam structures? and the potential of numerical methods

Experimental Substantiation of Internal Strength Parameters of L. N. Rasskazov’s ≪Energy≫ Soil Model

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