Determination of the stress-strain state of earth dams with account of elastic-plastic and moist properties of soil and large strains

Scientific papers [7–20] are devoted to the solution of certain aspects of this problem: • in [8] the method for simulation of the structure response subjected to seismic excitation of high level is offered; it allows to account geometric non-linearity and inelastic character of material. Performed studies in non-linear dynamics show a good agreement with experimental results; • in [10] finite element is used for numeric calculation of earth dams; it takes into consideration moist, non-moist and plastic properties of soil. Calculations of three dams were carried out with the use of the offered model; • the work [11] considers the model which takes into account geometric factors, depending on stress-strain state of earth dams at the process of filling it with water. The use of such model allows determining factual mechanism of strains and explaining the reasons of strain in case of unexpected behavior of the structure under the study; • the work [12] with the use of different software evaluates a possibility of occurrence of large displacements; it is noted that input acceleration increases with the rise of the height of a dam and in the crest of a dam the large displacements appear; so the evaluation of the dam strength should be carried out with consideration of both static and seismic loads; • the work [13] offers the methods which allow predicting the behavior of a dam and the degree of its reliability under given expected strains from external effects and calculating the parameters of required protective constructive-technological measures; • [14] considers the determination of stress-strain state of heterogeneous structure, which rests on elastic half-space; its mathematical model and algorithm of design were realized for investigation of stress-strain state of earth dam. Numerical simulation of stress-strain state of earth dams furnished with aseismic belts with account of both elastic and moist properties of soil is considered in [15]; these studies allow to reveal that an installation of aseismic belts strengthens the area of slope directly adjoining it. The problem of influence of these factors on the stress-strain state and strength of earth dams is not thoroughly studied and needs detailed research. The paper presented below is devoted to the development of mathematical model, methods and algorithms for determination of the stress-strain state of earth structures with account of elastic-plastic properties, moisture content of soil and large strains; it presents the study of stress-strain state of concrete earth dams of different heights with account of mentioned factors under different static effects.

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