Magazine of Civil Engineering, No.6(50), 2014
Engineering networks. Hydraulic construction. Soil mechanics
for this half-year
N.D. Belyaev, V.V. Lebedev, I.S. Nudner, A.V. Mishina, K.K. Semenov, D.I. Shchemelinin
Scouring, caused by waves, currents and races of
ship propellers, has been a subject of theoretical investigations, physical
modeling in hydraulic laboratories and full-scale experiments in several
countries. The results reported on these tests usually recommend
formulas and diagrams to determine water velocities that can be used to
estimate the risk of scouring and design the required protection measures.
I.G. Kantardgi, S.L.
A numerical model of surface wave movement and
water filtration in saturated-unsaturated porous medium has been developed. The
model can be used to define the parameters of the wave run-up on the slope
protected with a permeable fixed layer. The model is applied to determine
positions of the free wave surface at the different times, including such
parameters as the height of wave run-up and wave run-down on the slope.
V.N. Bukhartsev, H.T. Nguyen
One of the main issues in designing earth
structures is to ensure their slope stability. To analyze the stability of soil
mass affected by seepage forces a new method has been proposed where all equilibrium conditions and boundary conditions at
the ends of the surface profile are satisfied by strain and orientation of
areas of shear.
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A brief analysis of the
examined groundwater models has shown that since there is a large variety of
soil types and their properties it is impossible to create a universal ground
model. A variant of the
engineering kinematic theory of ground contact pressure as applied to
calculation of certain types of foundations has been suggested. To disclose
static indetermination of soil behavior under load, interacting with
foundations or fencing, its dimensionless diagram of soil deformation was used,
presented as a nonlinear function.
V.A. Emelianova, D.V. Nemova, D.R. Miftakhova
Today, one of the most
universal types of lining, in terms of the value for money, is rightly believed
to be suspended facade systems. Ventilated facade is characterized by the
presence of the vertical air gap. If the system has been installed with
violations, unventilated areas appear. Insufficient ventilation leads to
decreasing heat-shielding properties of the structure. It has to be clearly
understood how the ventilated air gap works and how its width affects the performance of the entire system.
V.N. Chechevichkin, N.I. Vatin
The degree of surface runoff pollution in large cities has been assessed
in modern conditions in the case study of production sites of St. Petersburg.
Increased content of petroleum derivatives and heavy metal ions both in
rainwater runoff and especially in snowmelt runoff has been revealed. It has been established that the composition of
infiltration runoff from the newly built-up sites within the city limits
commonly depends on their background, especially in the places of former
unauthorized dumps, which are usually buried under the building sites.
V.V. Titkov, S.M. Dudkin, P.D. Tukeev, A.V. Kosorukov
present study analyses heat modes of high voltage cable lines typical for
laying in the area of communications, different obstacles and engineering
networks, such as, for instance, hot water supply lines. It
is well-known that the load capacity of modern high voltage cable lines with a
plastic insulation is limited by the maximum permissible heating temperature of
90 °C. This
study focuses on two typical cases of heating mains influence on heat exchange
of a power cable line with surrounding ground.