Magazine of Civil Engineering, ¹9(35), 2012
The special. Hydraulic and specialized construction
SOFTWARE 
Search Subject plan for this halfyear 

Monitoring of the urban territories development, including the use of special software (rus)The technology concept for the analysis and monitoring of the townplanning 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.N. Ponomarev, V.D. Guskov, V.V. Vorontsov, I.V.
Ageyev, L.A. Kemenov, A.V. Romanov, I.R. Shegelman
This paper concerns the
problems of designing the light, fireproof, temperature stable and
manufacturable neutronabsorbing materials and also shows the way for
solving
these problems. It is found that using
the modified polymer components in the composite neutronabsorbing
material in
quantity not exceeding 12% wt does not exclude these compounds from the
class
of noncombustible materials. 

A.E. Burdonov, V.V. Barakhtenko, E.V. Zelinskaya, E.O.
Suturina, A.V. Burdonova, A.V. Golovnina
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. 

SOILS  
Nguyen Phuong Dzung
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. 

A.N. Badanin,
A.K. Bugrov, A.V. Krotov
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 fullscale
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. 

A.L. Goldin, Nguyen Fuong Dzung
Tests of soils taken from the collapsed slope of the HuaNa Hydropower
Station
(Vietnam) were conducted in stabilometer in consolidatedundrained
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. 

CALCULATIONS  
V.N. Buhartsev (Buharans), Nguyen Tkhay Khoang
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. 

M.M. Mirsaidov, T.Z. Sultanov, D.A. Khodzhaev
Numeric model, methods
and algorithm to evaluate the strength of earth dams were developed in
the
paper using BoltzmannVolterra hereditary theory of viscoelasticity and
Rzhanitsyn relaxation kernel. The estimated results of
stressstrain state and strength of earth dams under dynamic effects
are
considered. The basis of this method is finiteelement discretization
of
structure’s model, which leads to solvable system of integral
differential
equations and further to stepbystep method of its solution. 

B.D. Kaufman
Stationary and nonstationary plane problems of
hydromechanics for a semiinfinite 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 nonresonance
conditions are given. 

METHODS  
D.V. Stefanyshyn, V.B. Shtilman
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. 

I.U. Albert,
S.G. Shulman
In this paper, the estimated base model is a
semiinfinite 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. 

E.A. Andrianova, B.D. Kaufman, S.G. Shulman
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. 

STRUCTURES  
A.E. Andreyev, T.V. Ivanova
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 nearcritical 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. 

A.S. Bolshev, S.A. Frolov, V.A. Chernetsov, T.V.
Filipovskaya
Research results of floating caisson damping system
of Ñ1 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. Softlanding system of each floating dam involved the groups
of
hydraulic dampers and supporting structures, equipped with damping
elements. 