75504 2712-8172 Magazine of Civil Engineering 6 50 2014 1-100
RAR RUS 4-12 Peter the Great Saint Petersburg Polytechnic University Belyaev Nikolay dnd@mail.ru
Polytechnicheskay, 29
 23 State Marine Design Institute – branch of “31 State Design Institute of Special Construction” Lebedev Vladimir vladimir.v.lebedev@mail.ru 23 State Marine Design Institute – branch of “31 State Design Institute of Special Construction” Nudner Igor igor_nudner@mail.ru "23 State Marine Design Institute" – branch of OJSC "31 State Design Institute of special construction" Mishina Anastasiya mishina-anastasi@mail.ru 36338165900 Peter the Great St. Petersburg Polytechnic University Semenov Konstantin semenov.k.k@gmail.com
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 23 State Marine Design Institute – branch of “31 State Design Institute of Special Construction” Schemelinin Dmitry dimabens@gmail.com Experimental study of tsunami-type waves impact on soil at foundations of offshore gravity platforms 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. The results of the physical modeling of interaction of long tsunami-type waves with an offshore gravity platform are presented in this article. The reaction of seabed soil to wave impact at the platform foundation has been studied and the obtained results have been analyzed. Conclusions about changes in the seabed profile, density of the top layers of the seabed soil and their influence on the platform stability have been made. 10.5862/MCE.50.1 tsunami gravity platform soil density scour https://engstroy.spbstu.ru/article/2014.50.1/ 01.pdf
RAR RUS 13-23 6602848417 0000-0002-0587-4722 National Research Moscow State Civil Engineering University Kantardgi Izmail kantardgi@yandex.ru The Institute of Mathematical Machines and Systems Problems NAS of Ukraine Kivva Sergey skivva@gmail.com Moscow State University of Civil Engineering Shunko Nataliya natshunko@rambler.ru Wave run-up on permeable fixed reveted slopes 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. In addition, both flow velocity field in the upper protected layer and moisture distribution in the soil body of the slope were defined. The model is verified with the results of the published large-scale tests that have been conducted at Technical University Braunschweig in the wave flume with the slopes protected according to Elastocoast technology. The numerical model can be applied to calculate the run-up of extreme waves on protected engineering and beach slopes in natural conditions. 10.5862/MCE.50.2 reveted slopes permeable polyurethane layers wave run-up water filtration numerical modeling comparison with large-scale tests https://engstroy.spbstu.ru/article/2014.50.2/ 02.pdf
RAR RUS 24-31 Peter the Great St. Petersburg Polytechnic University Bukhartsev Vladimir gts.bu@cef.spbstu.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Nguyen Tkhay Khoang hoang293@gmail.com
Polytechnicheskay, 29
 Application of the variation method to assess stability of waterlogged soil masses 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. To find the most hazardous hypothetical failure surface a variational method was used, which involves solving Euler-Lagrange differential equation as a necessary condition for the existence of functional extremum. Since the problem can be solved in the framework of the scheme of limit equilibrium of soil masses with the use of the Mohr-Coulomb strength criterion, one of the parameters of soil strength acts as a functional for the given values of another parameter. Sufficiency of the existing functional extremum is verified numerically. 10.5862/MCE.50.3 stability of soil mass seepages forces depression surface variational method equilibrium conditions boundary conditions https://engstroy.spbstu.ru/article/2014.50.3/ 03.pdf
RAR RUS 32-39 Peter the Great St. Petersburg Polytechnic University Minaev Oleg minaev.op@bk.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 An effective method of explosive compaction of hydraulic structures foundations If an explosive compaction method is used, there are two ways to blast charges in each turn: simultaneous and consecutive. This paper presents the results of theoretical studies, field trials and pilot sealing in production conditions, proving the effectiveness of the method of sequential detonation compared to the simultaneous one with base soils compacting on site. The conducted theoretical studies have shown that sequential detonation of neighboring charges with the time interval Δt that is smaller than the time of compaction of liquefied soil base layer t UP1 from previous charge multiple destruction of soil structure occurs with its consolidation within the limits of the compacted base. The obtained results of experimental trials have showed an increase in the relative values of average and maximal settlement on the site with sequential detonation compared with the one with the simultaneous one. Accordingly, the resistance of the implementation of the static probe tip Qz increased to the values that showed a solid build of sand bases after compacting using the method of sequential detonation of charges. 10.5862/MCE.50.4 bases and structures hydraulic engineering water-saturated sand soils blasting method of compaction the method of sequential blasting of charges settlements density https://engstroy.spbstu.ru/article/2014.50.4/ 04.pdf
RAR RUS 40-52 Peter the Great Saint Petersburg Polytechnic University Korovkin Vladimir korovkin40@yandex.ru
Polytechnicheskay, 29
 Engineering kinematic theory of ground contact pressure as applied to calculation of certain types of foundations 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. An equation for the contact soil pressure on foundations with the use of the proposed coefficient of vertical pressure associated with the coefficients of lateral pressure on the walls of conventional seal wedge was given. An engineering solution has been obtained for rigid foundations settlement for a complete cycle of vertical load. The way to determine the stiffness coefficient of the foundation soil was presented. Application of the engineering kinematic theory of ground contact pressure was shown on some practical examples. 10.5862/MCE.50.5 models of soil mechanics continuum foundation ground contact pressure mixed problem stiffness coefficient of the foundation elastic and plastic medium https://engstroy.spbstu.ru/article/2014.50.5/ 05.pdf
RAR RUS 53-66 Peter the Great Saint Petersburg Polytechnic University Emelianova Varvara shein91@mail.ru
Polytechnicheskay, 29
 56227381900 0000-0003-2673-4566 Peter the Great Saint Petersburg Polytechnic University Nemova Darya darya.nemova@gmail.com
Polytechnicheskay, 29
 Miftakhova Dinara Optimized structure of ventilated facades 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. If the dependence between the size of the channel (height L and width h) and the average speed of free-convective flows is determined it is possible to choose an optimal width of the air gap. This will allow the system to work as efficiently as possible and thus pay off the costs related with installation of the system. The aim of this work was to enhance the structure of the ventilated facade, find methods to define a hydraulically optimal air gap and estimate savings for the system with maximum efficiency. As a result it has been proved that it is reasonable to apply a hydraulically optimal facade. 10.5862/MCE.50.6 hydraulics ventilated facade free convective flow vertical air gap the price of pressure losses hydraulically optimum channel https://engstroy.spbstu.ru/article/2014.50.6/ 06.pdf
RAR RUS 67-74 Peter the Great Saint Petersburg Polytechnic University Chechevichkin Viktor filter-w@mail.ru
Polytechnicheskay, 29
 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Specifics of surface runoff contents and treatment in large cities 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. The content of petroleum derivatives in such surface runoff can exceed significantly their content in the runoff of landfills. Most petroleum derivatives appear in the surface runoff as emulsified and associated with suspended matters forms, which are a source of secondary pollution of waste water as it is accumulated in settlers and traps of local waste water treatment plants. Filtrational-sorptive technologies of surface runoff treatment are the most effective and simple in terms of both treatment and waste disposal. 10.5862/MCE.50.7 surface runoff treatment rainwater runoff snowmelt runoff infiltration runoff heavy metals petroleum derivatives https://engstroy.spbstu.ru/article/2014.50.7/ 07.pdf
RAR RUS 75-83 Peter the Great St. Petersburg Polytechnic University Titkov Vasiliy titkovprof@yandex.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Dudkin Sergey dudkin@eef.spbstu.ru
Polytechnicheskay, 29
 Tukeev Pavel paultuk@yandex.ru Peter the Great St. Petersburg Polytechnic University Kosorukov Anton kosorukov_anton@inbox.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 The capacity limitations of power transmission cable lines in the structure of civil and industry engineering networks The 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: 1) the rapprochement of a power cable line with a heating main – the segment of a parallel disposal of a cable line and a heating pipe; 2) the intersection of a cable line and a heating main – the area where the cable line going above the heating main crosses it at the angle of 90 degrees. We have proposed the model of a prolonged cylinder with inhomogeneous thermophysical and heat exchange parameters distribution along this cable for the temperature distribution along a power cable in terms of non-regular laying. The finite-element method has been used to solve the problem of cable line heating fields near heating main calculation. A quantitative analysis of the cases described above has revealed that the local cable temperature excess up to several tenths of degrees is typical for them. It leads to the transmission capacity decrease by 20–30 % and limits the cable line ability to cover peak loads occurring in industrial, natural or other disasters. Besides, cable line segment spillover out of permissible temperature mode leads to emergency, power shortage and further repairing efforts. While engineering and calculations of the cable lines modes, our proposed techniques allow avoiding critical temperature conditions which may lead to the consequences described above. 10.5862/MCE.50.8 underground high voltage power cable capacity limitation specially developed math models https://engstroy.spbstu.ru/article/2014.50.8/ 08.pdf