Magazine of Civil Engineering, 9(35), 2012
The special. Hydraulic and specialized construction


 SOFTWARE

Search

Subject plan
for this half-year

Monitoring of the urban territories development, including the use of special software (rus)

Monitoring of the urban territories development, including the use of special software (rus)

The technology concept for the analysis and monitoring of the town-planning development is given. This technology will allow forecasting and complex planning the urban development of districts depending on current situation.
Read the article (rus)>>>


MATERIALS
A new high performance neutron-absorbing materials based on the mineral binder and polymer components

A.N. Ponomarev, V.D. Guskov, V.V. Vorontsov, I.V. Ageyev, L.A. Kemenov, A.V. Romanov, I.R. Shegelman
A new high performance neutron-absorbing materials based on the mineral binder and polymer components (rus)

This paper concerns the problems of designing the light, fireproof, temperature stable and manufacturable neutron-absorbing materials and also shows the way for solving these problems. It is found that using the modified polymer components in the composite neutron-absorbing material in quantity not exceeding 12% wt does not exclude these compounds from the class of noncombustible materials.
Read the article >>>

Physical and mechanical properties of composite materials of different compositions based on waste products

A.E. Burdonov, V.V. Barakhtenko, E.V. Zelinskaya, E.O. Suturina, A.V. Burdonova, A.V. Golovnina
Physical and mechanical properties of composite materials of different compositions based on waste products (rus)

This paper presents a study on the effect of mineral filler on the polymer composite material based on waste products of heat and power engineering - fly ash. The article shows research results of the ash chemical composition as well as the properties of the resulting materials on its basis. According to the research conclusions there is a prospect for using this material in the construction industry.
Read the article >>>

SOILS
The dependence of the strength properties of soil on its physical state

Nguyen Phuong Dzung
The dependence of the strength properties of soil on its physical state (rus)

Research results of the dependence of the soil strength on its physical state (density and moisture) are presented. It was found that increase in the soil density brings to increase in the angle of internal friction and cohesion, but increase in the moisture, on the contrary – to its decrease. Collapse mode of specimens tested in stabilometer depends on how the value of the effective vertical stress relates to preconsolidation pressure, determined by compression test.
Read the article>>>


The determination of the first critical load on particulate medium of sandy loam foundation

A.N. Badanin, A.K. Bugrov, A.V. Krotov
The determination of the first critical load on particulate medium of sandy loam foundation (rus)

A theoretical substantiation of definition of the first critical load on the foundation according to the mechanics of particulate media theory by I.I. Kandaurov is presented. Further comparison of results of full-scale ground tests on a real building site and calculations by the offered theoretical substantiation is executed. The comparison results show the possibility of application of the mechanics of particulate media on foundations’ design.
Read the article>>>

Plotting the stress-path for unsaturated soil during consolidated undrained tests in stabilometer

A.L. Goldin, Nguyen Fuong Dzung
Plotting the stress-path for unsaturated soil during consolidated undrained tests in stabilometer (rus)

Tests of soils taken from the collapsed slope of the Hua-Na Hydropower Station (Vietnam) were conducted in stabilometer in consolidated-undrained state. The changes in strength parameters of the unsaturated soils depending on the value of absorption and therefore volume humidity are examined. The stress paths were plotted for these samples; it can be used to determine the stress strain behavior of the soil, found knowing the initial absorption and stress.
Read the article>>>


CALCULATIONS
Estimation of the soil body stability (rus)

V.N. Buhartsev (Buharans), Nguyen Tkhay Khoang
Estimation of the soil body stability (rus)

The special methodfor estimation of stability of the soil body is stated. Search for the most dangerous surface of failure is based on the variation principle. The proposed method is used to identify the impact of such factors like boundary conditions, the shape of the surface of failure, the law of normal stress distribution over the surface of failure on the estimating the slope stability.
Read the article>>>

Stability evaluation of slopes of earth dams with account of soil rheological properties

M.M. Mirsaidov, T.Z. Sultanov, D.A. Khodzhaev
Stability evaluation of slopes of earth dams with account of soil rheological properties

Numeric model, methods and algorithm to evaluate the strength of earth dams were developed in the paper using Boltzmann-Volterra hereditary theory of viscoelasticity and Rzhanitsyn relaxation kernel. The estimated results of stress-strain state and strength of earth dams under dynamic effects are considered. The basis of this method is finite-element discretization of structure’s model, which leads to solvable system of integral differential equations and further to step-by-step method of its solution.
Read the article>>>

Accounting for the impact of uncertain factors on the determination of the hydrodynamic pressure on the dam (rus)

B.D. Kaufman
Accounting for the impact of uncertain factors on the determination of the hydrodynamic pressure on the dam (rus)

Stationary and non-stationary plane problems of hydromechanics for a semi-infinite fluid layer of finite depth are considered. Hydrodynamic pressure on the vertical upstream face of the dam under the horizontal seismic load with energy absorption on the reservoir bottom and a layer of sediment is determined. Uncertain factors are the amplitude of the impact and the absorption parameter. Point estimation (based on probability theory) and interval estimation (using theory of possibilities) of the spread of hydrodynamic pressure on dam under acoustic resonance and non-resonance conditions are given.
Read the article>>>

METHODS
Towards assessing the probability of water overflow across the dam crest (rus)

D.V. Stefanyshyn, V.B. Shtilman
Towards assessing the probability of water overflow across the dam crest (rus)

The probability assessment of the water overflow across the dam crest using the fault tree method is given. Within the framework of this method various heuristic procedures may be most adequately realized and for the probabilistic assessment of the basic events the methods of the statistical and / or expert’s reliability assessment may be used besides the parametric reliability theory methods. Such an approach permits to unify the procedure of the probabilistic assessment of the water overflow across the dam crest.
Read the article>>>


I.U. Albert, S.G. Shulman
Probabilistic assessment of the ground base reliability under the seismic load (rus)

In this paper, the estimated base model is a semi-infinite homogeneous medium, but the described methods can be used for more complex models of soil bases. The method consists in adapting the relations used in the regulatory methodology to assess the reliability with the random nature of the values within the relations. This adaptation is realized by the construction of the model response function followed by Fourier series expansion and preservation of the linear terms in the expansion.
Read the article >>>

Evaluation of the damping effect of the base on the vibrations of the structure (deterministic, probabilistic and possibilistic approach) (rus)

E.A. Andrianova, B.D. Kaufman, S.G. Shulman
Evaluation of the damping effect of the base on the vibrations of the structure (deterministic, probabilistic and possibilistic approach) (rus)

The solution of problems of dynamic structure interaction with its base is always connected with a problem of uncertainty of initial information. However, in recent decades other methods are being developed, for example, the theory of possibilities, which allows estimating with incomplete statistics, when the use of probabilistic methods is incorrect. The procedure for estimating the impact of different factors on the structure reliability with incomplete or inaccurate initial information is given.
Read the article >>>

 STRUCTURES
Bottom paving as a part of the low pressure culvert erected by the float-on method (rus)

A.E. Andreyev, T.V. Ivanova
Bottom paving as a part of the low pressure culvert erected by the float-on method (rus)

Article is devoted to the issues of the improvement of bottom paving structures in low pressure constructions and the technology of its erecting. Features of controlling the near-critical flows arising during the operation are analyzed. Possible ways of technology improvement of structures are given illustrated by the example of bottom paving structures with guide elements. Results of hydraulic researches validating this construction are given.
Read the article >>>

The damping system for floating caisson of -1 navigation pass of St.-Petersburg flood protection barrier (rus)

A.S. Bolshev, S.A. Frolov, V.A. Chernetsov, T.V. Filipovskaya
The damping system for floating caisson of -1 navigation pass of St.-Petersburg flood protection barrier (rus)

Research results of floating caisson damping system of -1 navigation pass are presented in the study. Substantial vibrations of floating dams in the process of putting it on the threshold caused by wave disturbance and flow determined the necessity of the development of special devices, providing damping these oscillations in the final phase of the dam immersion. Soft-landing system of each floating dam involved the groups of hydraulic dampers and supporting structures, equipped with damping elements.
Read the article >>>

Contact us Site map
All rights reserved. When using the information from this site the mention of the resource is obligatory