Deformation Parameters of Macrofragment Soils in Soil Dams

Sainov, M. P.

doi:10.22227/2305-5502.2014.2.2

Cited by 3 publications

(5 citation statements)

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“…The accumulation of the field monitoring data of the deformation of built rockfill dams enabled Pinto and Marques [14], Hunter [15], Fitzpatrick 11 to perform behavior analyses of the rockfill in real conditions. By the moment, much more monitoring data have been accumulated [16][17][18][19][20]. In papers [21][22][23], by means of numerical modeling a so-called back-analysis All those studies found out that the deformation modulus of the rockfill is different at accommodation of the own weight load and the hydrostatic pressure.…”

Section: Comparison Of the Results Of Laboratory Tests And Field Monimentioning

confidence: 99%

“…Веденеева (СССР) для испытаний грунтов применялся стабилометр ПТС-300, в котором образец грунта имеет диаметр 300 мм и высоту 650 мм. На этом приборе проводились испытания модельных грунтов каменной наброски плотин Тери, Зарамагских ГЭС [18].…”

Section: описание лабораторных испытаний каменной наброскиunclassified

“…300 mm and sample height 650 mm. In this instrument, model soils of the rockfill of Teri, Zaramagsky HPP dams were tested [18].…”

Section: Rockfill Laboratory Tests Descriptionmentioning

confidence: 99%

“…Rasskazov the effect of the deformability lowering along with the growth of the circumferential pressure and the effect of the deformability increase along with the approaching of the strength state of the soil to the limit are accounted for. Under recognition of the changes the model was subject to in the course of our studies [18], the expression to determine the shear modulus has the following appearance: whereby m is the empirical exponent; G 0,elast is the initial (at σ 3 = 1) shear modulus for elastic deformations; G 0,plast is the initial (at σ 3 = 1) shear module for plastic deformations; k is the relative strength factor; B is the empirical parameter accounting for the number of the destroyed elastic links.…”

Section: Plotting Of a Deformation Model Of The Rockfill Based On Thementioning

confidence: 99%

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Deformation of rockfill in bodies of rockfill dams

Sainov

2019

Stroitel’stvo: nauka i obrazovanie

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Introduction. The main factor determining the stress-strain state (SSS) of rockfill dam with reinforced concrete faces is deformability of the dam body material, mostly rockfill. However, the deformation properties of rockfill have not been sufficiently studied yet for the time being due to technical complexity of the matter, Materials and methods. To determine the deformation parameters of rockfill, scientific and technical information on the results of rockfill laboratory tests in stabilometers were collected and analyzed, as well as field data on deformations in the existing rockfill dams. After that, the values of rockfill linear deformation modulus obtained in the laboratory and in the field were compared. The laboratory test results were processed and analyzed to determine the parameters of the non-linear rockfill deformation model. Results. Analyses of the field observation data demonstrates that the deformation of the rockfill in the existing dams varies in a wide range: its linear deformation modulus may vary from 30 to 500 МPа. It was found out that the results of the most rockfill tests conducted in the laboratory, as a rule, approximately correspond to the lower limit of the rockfill deformation modulus variation range in the bodies of the existing dams. This can be explained by the discrepancy in density and particle sizes of model and natural soils. Only recently, results of rockfill experimental tests were obtained which were comparable with the results of the field measurements. They demonstrate that depending on the stress state the rockfill linear deformation modulus may reach 700 МPа. The processing of the results of those experiments made it possible to determine the parameters on the non-linear model describing the deformation of rockfill in the dam body. Conclusions. The obtained data allows for enhancement of the validity of rockfill dams SSS analyses, as well as for studying of the impact of the non-linear character of the rockfill deformation on the SSS of reinforced concrete faces of rockfill dams.

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Section: Comparison Of the Results Of Laboratory Tests And Field Monimentioning

confidence: 99%

Section: описание лабораторных испытаний каменной наброскиunclassified

“…300 mm and sample height 650 mm. In this instrument, model soils of the rockfill of Teri, Zaramagsky HPP dams were tested [18].…”

Section: Rockfill Laboratory Tests Descriptionmentioning

confidence: 99%

Section: Plotting Of a Deformation Model Of The Rockfill Based On Thementioning

confidence: 99%

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Deformation of rockfill in bodies of rockfill dams

Sainov

2019

Stroitel’stvo: nauka i obrazovanie

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“…Coarse-clastic soils are one of the most promising building materials in the eld of earth dam construction. Building materials for such structures can more often be destroyed [10][11][12]. As is known, coarse-clastic soils are widely used for supporting the prism of rock and earth structures and occupy an average of 70% of the total volume of the dam [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Compaction of Course-Clastic Soils at an Experimental Site During the Earth Dam Construction

Artykbaev,

Nazarov,

Kanat

2023

Preprint

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This paper examines the results of laboratory and field studies on the compaction of coarse-clastic soils. In the laboratory conditions, a 300 mm diameter vibratory unit and a standard compaction device, developed by SRI Soyuzdor, were used for the soil compaction. In the field conditions, the compaction was carried out using a smooth SANY-type roller weighing 27 tons. In the laboratory, to determine the maximum density and optimal moisture content, a dry soil density – moisture content curve was plotted; the maximum density and optimal moisture values were determined according to the maximum of the obtained curve. The paper presents the results of soil compaction in the field conditions at a layer thickness of 50, 70, and 80 cm. The densities in these cases were 2.19, 2.10, and 2.04 t/m3, respectively. The soil compaction was implemented using a 27-ton roller compactor for 6–8 passes along one track. In addition, the effectiveness of the applied method of drilling and blasting in a quarry for obtaining stone material with the required fractional composition is shown

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Impact of Dam Rockfill Creep on Reinforced Concrete Face Stress-Strain State

Sainov

Kirichenko

2019

Stroitel’stvo: nauka i obrazovanie

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Introduction. Rockfill deformations are developed during long time. It is known that most intensive they are during construction period, but their increment continues also during operation period due to creep. Therefore, creep may affect the reinforced concrete face stress-strain state. Nevertheless, search for the scientific and technical information showed that the problem of creep impact on the face strength is poorly studied. Materials and methods. Studies of stress-strain state were conducted with the aid of numerical modeling by finite element method. They were carried out on the example of in-situ Toulnustouc dam, which deformations during the operation period are known by the results of field measurements. For simulation of the time-dependent dam, deformation increment process there was chosen a rheological model of soil and a technique was worked out for calculating the dam stress-strain state. At plotting the rheological model, the use was made of the simplest exponential relationship of time-dependent deformations. Results. The parameters of the rockfill model were determined by selection from condition of matching between the dam design displacements and the field data. For the considered dam, the rockfill creep has not resulted in cardinal changes in the reinforced concrete face stress-strain state. Conclusion. It was revealed that increase of the dam settlements due to creep has a favorable effect: they create additional compressive longitudinal force in the face.

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Deformation Parameters of Macrofragment Soils in Soil Dams

Cited by 3 publications

References 3 publications

Deformation of rockfill in bodies of rockfill dams

Deformation of rockfill in bodies of rockfill dams

Compaction of Course-Clastic Soils at an Experimental Site During the Earth Dam Construction

Impact of Dam Rockfill Creep on Reinforced Concrete Face Stress-Strain State

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