75504 2712-8172 3 55 2015 1-109

RAR RUS 3-9 H-9967-2013 16412815600 0000-0002-8588-3871 National Research University "Moscow Power Engineering Institute" Kirsanov Mikhail mpei2004@yandex.ru

14, Krasnokazarmennaya, 111250 Moscow, Russia

Discrete model of the pile foundation The solid pile foundation is modeled by elastic vertical bars distributed over the area of the base in a uniform grid. It was assumed that the body of the structure is rigid, its weight is offset from the geometric center. The solution of statically indeterminate systems was obtained by the force method with the help of the Maxwell-Mohr formula. The method of induction made it possible to find a solution for an arbitrary number of piles. The dimensions of the foundation, the weight of the structure, the elastic characteristics of the piles (generalized stiffness), the number of the nodes in the grid of piles on both sides, the center of gravity coordinates were all the parameters of the solution. The computer algebra system Maple generated an analytical expression for the deformation and rotation angles of the foundation. The established dependencies exhibited limit (on the number of the piles) properties, allowing to estimate the deformation characteristics of the foundation and to optimize its design. 10.5862/MCE.55.1 foundation piles sediment exact solution Maple https://engstroy.spbstu.ru/article/2015.55.1/ 01.pdf

RAR RUS 10-20 Voronezh State University of Architecture and Civil Engineering Ikonin Sergey fornag@inbox.ru Voronezh State University of Architecture and Civil Engineering Sukhoterin Andrey asuhoterin@list.ru Design of the foundation slab with controlled forces Solid slab foundations, now widely used in foundation engineering, have one significant drawbackthe cost of steel used for their reinforcement. The authors proposed a design for the foundation slab with controlled forces. The solution differs from traditional ones as it implies adding hinged nodes into the body of the slab, which provides an almost universal decrease in the bending moments in the foundation. The article also presents the basic requirements for the design of the hinged node. In order to confirm the effectiveness of the proposed design, the paper provides a comparative analysis of the calculation results for the foundation slab with controlled forces versus the traditional solid foundation slab. The analysis of the calculation results leads to the conclusion that the hinged node provides substantial unloading for the sections of the foundation slab in bays and under the columns. 10.5862/MCE.55.2 slab foundation hinged node joint calculation https://engstroy.spbstu.ru/article/2015.55.2/ 02.pdf

RAR RUS 21-28 Institute of conitinuous media mechanics Russian Academy of Science Ural Branch Yepin Valeriy yepinv@gmail.com Institute of conitinuous media mechanics Russian Academy of Science Ural Branch Tsvetkov Roman flower@icmm.ru Institute of conitinuous media mechanics Russian Academy of Science Ural Branch Shardakov Igor shardakov@icmm.ru Deformation monitoring of building foundations by hydrostatic leveling When arranging a deformation monitoring system for a building, it is important to control the deformation state of its foundations. Various methods to control the deformation state of a building foundation include the method of hydrostatic leveling, which has a number of advantages. The article shows that this method, though underused now, is best applied to monitor differential foundation settlements on a continuous basis. This paper examines the factors affecting the accuracy of measurement by hydrostatic leveling and gives the recommendations for enhancing it. It was established that if measurements are made inside the building, it is possible to provide the level of measurement accuracy sufficient for most typical structures. The paper also gives examples of practical implementation of the self-engineered monitoring system based on the method of hydrostatic leveling, as well as their operating results. 10.5862/MCE.55.3 deformation monitoring foundation differential settlement hydrostatic leveling https://engstroy.spbstu.ru/article/2015.55.3/ 03.pdf

RAR RUS 29-37 North-Eastern Permafrost Station, Melnikov Permafrost Institute, Siberian Branch of Russian Academy of Sciences Guly Sergey svnims@mail.ru The study of the ground freezing method using natural cold to protect the foundation pit from groundwater inflow When the bottom of the foundation pit is below the groundwater level, groundwater drawdown is required; as a rule, it is extremely expensive. In order to reduce water drawdown costs in areas with consistently low air temperatures we suggest to excavate foundation pits in wintertime. As with hydraulic engineering constructions erected in the Far North, natural ground freezing allows for creating the waterproof ice wall that prevents the foundation pit from being flooded. The paper describes the sequence of ground freezing operations and methods to forecast the thermal state of the waterproof ground element during construction in Magadan, Russia. Calculations were made to reveal the conditions under which ice formation is probable in the foundation ditch when creating the ice wall, and a simple anti-icing method that involves using snow was proposed. The results can be applied in regions with extreme climatic conditions. 10.5862/MCE.55.4 foundation pit groundwater ice wall ground freezing snow cover icing https://engstroy.spbstu.ru/article/2015.55.4/ 04.pdf

RAR RUS 38-48 Institute of Water Problems and Land Reclamation Pobereznichenko Olga olia-olenia@ukr.net Contact elimination of iron from groundwater in agricultural water supply The authors constructed an experimental setup for contact elimination of iron from groundwater with a bioreactor and a polystyrene foam filter at an agricultural enterprise to ensure a regulatory content of iron in potable water. A method to calculate structural and technological parameters for filters to ensure minimum capital and operating costs under the regulatory quality indicators for purified water was developed. Based on experimental research, the relationship between the speed of water filtering and the duration of filtering, as well as between the speed of water filtering and filter charging (and hence, the duration of the useful work of the filter) were defined. The efficiency of deferrization and pressure loss across the filter in relation to the specific contaminant capacity of the filter and the filtration rate were studied. The minimum specific contaminant capacity of the filter for the experimental setup was determined. 10.5862/MCE.55.5 groundwater elimination of iron bioreactor polystyrene loading https://engstroy.spbstu.ru/article/2015.55.5/ 05.pdf

RAR RUS 49-56 Yuri Gagarin State Technical University or Saratov Kalyakin Aleksandr elevadim@gmail.com Yuri Gagarin State Technical University or Saratov Chesnokova Elena adamas.elena@gmail.com Generalized model of free turbulent flows around obstacles The article summarizes the results and discusses the application of the method of dimensional analysis to the problem of a real fluid flow past a circular cylinder. It presents the models which take into account the basic laws of kinematics and dynamics of the free fluid flow on the front of the streamlined cylinder, which can be useful both for the qualitative analysis of the phenomenon and for obtaining quantitative estimates. Dependencies characterizing the kinematics and dynamics of the fluid flow to the streamlined cylinder were deduced. The solution of the problem of the flow past an obstacle is of practical importance and can be used, for example, to predict the erosion upstream of intermediate bridge supports, to calculate the forces acting on projections and to design certain types of water intake facilities, etc. 10.5862/MCE.55.6 cylinder liquid flow vortex formations local resistance flow around https://engstroy.spbstu.ru/article/2015.55.6/ 06.pdf

RAR RUS 57-66 36338165900 Peter the Great St. Petersburg Polytechnic University Semenov Konstantin semenov.k.k@gmail.com

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Baltic State Technical University "Voenmeh" D.F.Ustinov Leontiev Viktor leontiev.vict@yandex.ru 23 State Marine Design Institute – branch of “31 State Design Institute of Special Construction” Nudner Igor igor_nudner@mail.ru Sea wave impact on a ship moored at the berth with a stilling pool When designing berths and ship mooring systems near berths, it is necessary to protect ships from dangerous displacements. To make a well-reasoned choice, it is necessary to make estimates of the characteristics of sea wave impact on the ship (with respect to the steady-wave mode in the waters). The results of numeric calculations are better suited for engineering purposes. This paper presents a mathematical model to estimate hydrodynamic characteristics of wave impact on the ship moored at the berth with a stilling pool. To derive this mathematical model, the analytical method using eigenfunction expansion was employed. Also, the article shows the calculation data to demonstrate the influence of berth characteristics on loads experienced by the ship. 10.5862/MCE.55.7 berth stilling pool mooring of a ship wave impact https://engstroy.spbstu.ru/article/2015.55.7/ 07.pdf

RAR RUS 67-78 Sochi State University Makarov Konstantin ktk99@mail.ru Sochi State University Chebotarev Artem chebotarev-artem@mail.ru Breakwater placement at the root of a seawall The laboratory simulation established that the oblique wave approach and the absence of a beach expose the breakwaters made of shaped blocks at the root of seawalls to significant wave impacts, which results in their loss of stability. The mass of blocks required to maintain the stability of the structures is significantly greater than the one calculated in regulatory documents. This can be explained by the interference of direct and reflected waves. For a wave fully reflected from a seawall, the standing wave affecting the breakwaters will reach a height twice as great as the original. For a partially reflected wave, the height of the interfered wave depends on the angle of wave approach and the design of the seawall. The paper presents a theoretical rationale and a calculation methodology and introduces the results of numerical experiments. 10.5862/MCE.55.8 port seawalls protective breakwater wave impacts stability of shaped blocks https://engstroy.spbstu.ru/article/2015.55.8/ 08.pdf

RAR RUS 79-88 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 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 Selection of protective measures against scouring at the foundations of offshore gravity platforms One of the main problems in offshore engineering is associated with scour protection at marine structures. Operation of gravity platforms may be unsafe if the soil is washed out from under their foundations due to the effect of waves and currents. The structures may lose stability and collapse. When designing a fixed platform, it is necessary to exclude the occurrence of a significant bottom scour near its base. There are various measures to protect soil foundations under offshore gravity structures from local scour. This article gives an overview of existing constructions, proposes a classification of such structures and provides recommendations on the method of selecting protective measures. In conclusion, it asserts the importance of setting the terms of their inter repair maintenance, monitoring and inspection. 10.5862/MCE.55.9 gravity platform scour measures to protect the foundation classification life time https://engstroy.spbstu.ru/article/2015.55.9/ 09.pdf