Karim Sultanovich Sultanov

Karim Sultanovich Sultanov
Uzbekistan Academy of Sciences · Institute of Mechanics and Seismic Stability of Structures

PhD; DSc; Prof.

About

50
Publications
1,925
Reads
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307
Citations
Citations since 2016
29 Research Items
275 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
1. The wave theory of earthquake resistance of underground structures and its applications. 2. The theory of the strength of structurally unstable soils during deformation and wetting. 3. Strength in non-linear deformation of textile threads and yarns. 4. Mesomechanics of materials with a hierarchical structure.
Education
September 1971 - September 1977
Lomonosov Moscow State University
Field of study
  • Faculty of Mechanics and Mathematics

Publications

Publications (50)
Article
Full-text available
Nonlinear laws of interaction of underground pipelines with soil are considered, based on linear-elastic, visco-elastic laws of shear strain in soils, and Coulomb’s law. Mathematical expressions are derived that relate the parameters of interaction to the strength characteristics of soil under shear, which allows them to be used in calculations for...
Article
Full-text available
Wave propagation in an elastic cylindrical body interacting with an external moving absolutely non-deformable medium (a cage) under a shock load on the front end is considered. The friction force arising on the contact surface directly depends on the parameters of the propagating waves and, due to the external medium motion, - it is active. The sta...
Article
Full-text available
The object of the research is an underground straight horizontal pipeline subjected to seismic impact. The research method was analytical. The results were compared with the experimental results of other authors and computer calculations. It was shown that the main disadvantage of the dynamic theory of seismic resistance of underground pipelines is...
Conference Paper
Full-text available
Рассматривается распространение волн в упругом цилиндрическом теле, взаимодействующем с внешней движущейся абсолютно недеформируемой средой (обоймой) при ударной нагрузке на передний торец. Сила трения, возникающая на контактной поверхности, прямо зависит от параметров распространяющихся волн и в силу движения внешней среды - она является активной....
Article
Full-text available
One of the main reasons for the nonlinearity of the tension diagrams of cotton yarns is the variability of their moduli of elasticity and plasticity under strain. The changes in strain moduli obtained from the tensile diagrams confirm this. The strain curve has ten parameters, the values of which depend on the method of yarn manufacture and the str...
Article
Full-text available
Our results on the strength parameters of cotton yarns manufactured by carded and combed systems by ring and rotor spinning (CD-carded ring-spun, OE-carded rotor-spun, CM-combed ring-spun) are presented. Experiments to test yarns for strength were conducted on a “Statimat C” tensile installation at speeds of the lower end of the yarn from 100 mm/mi...
Article
Full-text available
The unsteady-state axisymmetric problem of longitudinal interaction of a cylindrical body with external elastic medium is considered in the paper. The condition of Coulomb friction is accepted at the contact boundary. The solution is implemented by the finite difference method. The results are shown in graphs and analyzed. The changes in stress, ve...
Article
Full-text available
Based on existing data of experimental studies of underground structure-soil interaction, a condition for boundary interaction between the underground pipeline and soil was developed. The proposed condition (a model) of interaction at the contact boundary takes into account the structural destruction of the contact soil layer and the cyclical natur...
Article
Full-text available
The results of numerical solutions of an axisymmetric two-dimensional problem of a rigid underground pipeline interaction with elastic-viscous-plastic soil are presented. The pipe-soil interaction begins when the underground pipeline moves in an axial (longitudinal) direction. The changes in velocity, displacement, shear stress, shear strains in th...
Article
Full-text available
This paper is devoted to the development of a method for determining longitudinal stresses in underground pipelines under periodic dynamic load, taking into account the complex process of pipe-soil interaction. The method is based on the solution of a two-dimensional axisymmetric unsteady wave problem for the “underground pipeline-soil” system. In...
Article
Full-text available
The paper presents the results of numerical solution obtained by the modified finite difference method according to the Wilkins scheme, to a two-dimensional unsteady-state problem of the plane shock wave propagation in an underground elastic pipeline, interacting with surrounding soil. Soil is considered to be an undeformable body moving relative t...
Article
Full-text available
A two-dimensional axisymmetric problem of shear wave propagation around an underground pipeline under longitudinal motion of the pipeline is solved numerically. Due to the significant difference in pipeline and soil rigidity, the underground pipeline is considered to be a rigid undeformable body and the soil medium around the pipeline is modeled by...
Article
Full-text available
The problem of longitudinal wave propagation in a cylindrical body in the presence of an incompressible external medium in a length limited area is solved in the paper in a one-dimensional statement. Along with the non-uniformity of motion, the friction force arising on the contact surface directly depends on the parameters of propagating waves. Nu...
Book
Full-text available
The monograph is devoted to experimental and theoretical study of rigid body interaction with soil. Based on experimental results the local laws of interaction of long underground pipelines and fragments of external surface of large-scale underground structures with soil of disturbed and undisturbed structure are built. Numeric solutions of the pro...
Book
Full-text available
Te monograph is devoted to the construction of the laws of strain in textile yarns (coton yarns) under tension, taking into account their nonlinear strain and structural changes. Te monograph gives a parametric analysis of the constructed law of nonlinear strain of coton yarn; the main parameters of the law and their changes are determined dependin...
Article
Full-text available
The results of laboratory experiments on the dynamic compression of loess soil samples at a falling weight deflectometer (FWD) are presented. From the results of the experiments, preliminary values of the mechanical characteristics of soils are determined. A numerical solution of the wave problem, the statement of which is identical to the experime...
Article
Full-text available
Mechanical characteristics of soils under dynamic and static loads are determined in laboratory conditions on special devices. Dynamic loads in the devices are initiated by an impact on a soil sample. Under the impact the waves are initiated in soil; they significantly affect the stress-strain state of soil samples placed in the device. Depending o...
Article
Full-text available
The experimental diagrams between stress and strain components for soft soils are non-linear. Nonlinear diagrams qualitatively differ for soils of undisturbed and disturbed structures. It is believed that the manifestations of nonlinear properties of soil are associated with micro-destruction of soil structure under compression and, therefore, with...
Article
Full-text available
Topical issues of textile yarn breakage in technological processes are considered in the paper. Based on a comparative analysis of cotton yarns specific breaking load with cotton fibre specific breaking load obtained in experiments, it was concluded that when the yarn breaks, the cotton fibres do not. This conclusion contradicts hypothesis of Aleks...
Article
Full-text available
The idea that mathematical simulation of the process of textile yarn stretching which reveals new features of its destruction in technological processes is substantiated in the paper. Mathematical model should take into account textile yarn motion velocity in technological processes, acting external forces, and the reliable law of yarn strain under...
Article
Full-text available
The method to define strain characteristics of soil under dynamic loading is proposed based on the results of experiments on dynamic compression of soils on the device for dynamic loading in laboratory conditions; the method allows solving wave problems with the statement similar to the statement of experiments. Using the proposed method, the modul...
Article
Based on the physically nonlinear law of deformation under tension, a formula for determining and predicting the strength of cotton yarn is proposed. © 2018 Ivanovo State University of Chemistry and Technology. All rights reserved.
Article
Full-text available
Nonlinear relations based on Winkler-like and Coulomb laws are proposed to describe the process of shear interaction between structures and soil. Their advantages and shortcomings are illustrated, along with the suitability of experimental results.
Article
Full-text available
The existence of a soil contact layer when there is shear interaction between a rigid body and the soil has been demonstrated by an analysis of the numerical solution of a one-dimensional unsteady problem on the interaction of a rigid strip with a non-linearly deformable soil medium. The occurrence of a peak value of the shear stress and subsequent...
Article
Full-text available
On the basis of results of experiments on stretching of a cotton yarn nonlinear dependences of the stretching force on longitudinal deformation of a thread are received. It is assumed that change of mechanical characteristics of a yarn is the reason of manifestation of nonlinear deformation of a cotton yarn at stretching and changes of the module o...
Article
Full-text available
On the basis of results of experiments the nonlinear elastic and visco-plastic model of deformation of cotton yarn at stretching is constructed and adequacy to the received model to skilled data is shown.
Article
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We present the results of quasistatic extension tests for a cotton thread until break. The obtained nonlinear dependence of the tensile force on the thread strain in elongation are used to construct the laws of nonlinear deformation of cotton threads treated as composite materials. To determine the parameters of the developed nonlinear deformation...
Article
Full-text available
The results of numerical solution of the nonstationary wave problem of longitudinal wave propagation in the bar-soil system are given. The barmaterial and the soil are assumed to be linearly viscoelastic (standard linear body). A nonlinear interaction condition is satisfied on the bar-soil contact boundary. The laws of propagation of longitudinal w...
Article
Full-text available
Some mechanisms by which longitudinal waves are attenuated in non-linear viscoelastic media, whose equation of state takes into account the presence of structural changes, are demonstrated. It is shown that the degree of attenuation of a longitudinal wave in such media is a linear function of the frequency.
Article
Full-text available
Results are presented for numerical solutions of the nonunidimensional problem of determining the slump-type deformations of a soil mass subject to uniform wetting. An equation that we developed for the state of the soil, which accounts for variation in the stress-strain state as the soil is wetted, is used here. Results of calculations are compare...
Article
Full-text available
Equations of state of soils prone to slump-type settlement, which take into account the degree of wetting in the initial stage, are developed on the basis of familiar models of the deformation of continua. Moreover, parameters characterizing the strength characteristics (indicators) of the soils are treated as functions dependent on degree of wetti...
Article
Full-text available
Using a model of an elastic and viscoelastic (standard-linear) solid, a non-linear equation of state is constructed to model the volume deformation of soft soils. The moduli of bulk compression are assumed to be non-linear functions of a parameter which characterizes the structural failure of the soil. It is shown that this law describes observed e...
Article
Full-text available
Experimental studies have established that the shear interaction of underground structures with soil is influenced by the physicomechanical properties of the soil, the roughness of the structure-soil contact surface, the contact pressure normal to the surface, and the rate of relative displacement (shear). Thus, the laws governing the interaction o...
Article
Mathematical model for soil-structure interaction is built on the basis of experimental studies of underground structure fragment - soil interaction. The model shows that tangential stress dependence relative displacement on underground structure - soil local surface is function of normal pressure to contact surface, relative displacement, undergro...
Article
Full-text available
Studies of the interaction between seismic blast waves and underground structures are conducted to select boundary conditions on the contact surface between these structures and the soil. In relation to this, a law governing longitudinal interaction between an elongated underground structure and the soil which, among other things, combines conditio...
Article
Full-text available
The stresses and the particle velocities in the soil, the loading at the obstacle, and its displacement were investigated earlier in experimental investigations of the interaction of explosion waves with obstacles [1–4]. Below we present the results of experimental investigation involving simultaneous measurement of stresses and strains of soil dur...

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