Transverse Vibrations of Underground Pipelines with Different Interaction Laws of Pipe with Surrounding Soils

Mardonov, B.; An, E. V.; Shojalilov, Shuhrat; Khakimova, Yakutxon; Ismoilova, Gulchexra

doi:10.1051/e3sconf/202126402035

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The proposed developed method and algorithm for solving seismic resistance problems for soil structures (dams, levees), based on the numerical solution to problems of the mechanics of a deformable rigid body (the finite element method), allows taking into account the above characteristics within the framework of the standards, and, in contrast to the current design standards [16] make a forecast of the stress state of the structure under certain loads. There are a large number of scientific publications in this direction concerning the seismic resistance of surface and underground structures [17][18][19][20][21][22][23][24][25]. These publications propose methods for solving problems of seismic resistance of surface and underground structures using numerical methods within the framework of current design standards.…”

Section: Methodsmentioning

confidence: 99%

Seismic stress state of a high earth dam using the spectroscopic method

Salyamova,

Toshmatov Alimjon ogli,

Nishonov

et al. 2023

E3S Web Conf.

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The reliable and safe operation of earth dams located in seismic regions of the Republic of Uzbekistan requires engineers and researchers to constantly improve the design normative methods for their calculation in order to identify safety margins and stability under various types of loads. A method is proposed for calculating the seismic stress state of an earth dam (on the example of the Pskem HPP being designed), based on the spectral method, in accordance with the current standards for the design of hydro-technical structures in seismic areas. Structural and piecewise non-homogeneous physical and mechanical characteristics of soils of the structure body were provided by Hydroproject JSC of the Republic of Uzbekistan. The results of the calculations show that under a horizontal seismic impact, the dam performs transverse oscillations. It was determined that the maximum vertical stresses are observed in the lower part of the upper slope, where the maximum hydrostatic pressure is reached. The maximum shear stresses appear at the base of the dam and on the surface of the downstream slope, where the risk of loss of strength under shear is greater..

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Section: Methodsmentioning

confidence: 99%

Seismic stress state of a high earth dam using the spectroscopic method

Salyamova,

Toshmatov Alimjon ogli,

Nishonov

et al. 2023

E3S Web Conf.

Self Cite

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“…In [16], the coupled finite element stress-flow procedure was improved to explore the rise of the underground pipes in the liquefied surrounding soil. Several problems in the study of the stability of underground pipelines with an initial deflection were solved in [17][18][19]. An extensive review of real observations, computational methods, and numerical simulations linked to the stability of underground pipelines in liquefied soils was presented in [20].…”

Section: Introductionmentioning

confidence: 99%

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Mardonov,

Mirzaev,

Nishonov

et al. 2023

E3S Web of Conf.

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The problem of loss of stability of underground pipelines with a middle part in the form of a straight or П-shaped part located in liquefied soils is considered in the article. The pipeline lifting process occurs under the action of buoyancy force in the liquefied soil zone and then under the action of the longitudinal compressive force that appears due to the temperature of the transported product and its pressure. The problem is solved by the finite element method. The results are presented as a table and graphs of changes in the values of transverse displacements along the coordinate depending on the pipeline geometric characteristics and the soil rheological properties. It is established that the П-shaped part is a damper against pipeline buckling.

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“…Interesting results were obtained when evaluating the dynamics of the dynamic damper's elastic plate and the liquid section [16]. Transverse vibrations of underground pipelines under different laws of pipe interaction with the surrounding soils and the dynamic interaction of the embedded cylindrical rod under axial harmonic forces are considered respectively by the authors of [17,18].…”

Section: Introductionmentioning

confidence: 99%

Transverse vibrations of underground pipeline with pinched ends

Abduvaliev,

Abdulkhayzoda

2023

E3S Web of Conf.

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The study of transverse oscillations of extended underground structures from the action of constant harmonic forces is of practical interest. Transverse vibrations of an underground cylindrical structure of finite length under the action of a system of concentrated forces that change according to a harmonic law are considered. The environment surrounding the structure is assumed to be elastic, while the interaction of the “environment-structure” system is studied. When considering the problem, the Fourier method and the results of solving the problem of vibrations of an unbounded cylindrical structure in an elastic medium from the action of concentrated harmonic forces were used. The problem of transverse vibrations of a cylindrical rod of finite length interacting with an elastic homogeneous medium is solved by the method of compensating loads. In this case, the structure is considered a source of waves radiated into space and satisfying the conditions of radiation to infinity. The resulting solution is approximate and reliable within the length of the rod. The analysis of the influence of soil conditions and geometric dimensions on the amplitude of oscillations of an underground structure was carried out according to the graphs of the amplitude-frequency characteristic of the object.

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Transverse Vibrations of Underground Pipelines with Different Interaction Laws of Pipe with Surrounding Soils

Cited by 5 publications

References 18 publications

Seismic stress state of a high earth dam using the spectroscopic method

Seismic stress state of a high earth dam using the spectroscopic method

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Transverse vibrations of underground pipeline with pinched ends

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