Magazine of Civil Engineering

RAR RUS 3-9 Kazan (Volga region) Federal University Sultanov Lenar ls561@mail.ru Kazan (Volga region) Federal University Berezhnoi Dmitriy Berezhnoi.Dmitri@mail.ru Kazan (Volga region) Federal University Karamov Andrey akaramovvnedry@mail.ru FEM-based calculation of soil mass with the impact of dilatancy There are a lot of papers about dilatancy, it is typical for the majority of highly concentrated dispersed systems. A three-dimensional deformation in the active zone of such systems is contraction and deformation by dilatancy. An increase is called dilatancy, a decrease is called negative dilatancy or contraction. The violation of soil strength due to a shift in one of the ground on the other is the most common fracture in the construction of excavation slopes. In this paper, we use a model similar to the model of a perfectly plastic body. The construction of a computational algorithm is based on sampling the computational domain in the finite element method. The modeling of soil is based on specific strength properties which determine its bearing capacity. They include the cohesion coefficient, the angle of internal friction coefficient and dilatancy coefficient, which characterizes soil loosening or compaction under deviatoric loads. The paper considered a number of model problems of elastic-plastic deformation of a dirt mound, studied the convergence of the solutions. It may be noted that the inclusion of the dilatancy decelerates the mound transition to the limiting state, and thereby a second band slip is forming. The implemented methodology allows the calculation of elastic-plastic deformation of soil masses, complying with the law of dry friction with and without dilatancy. 10.5862/MCE.48.1 soil plasticity dilatancy FEM https://engstroy.spbstu.ru/article/2014.48.1/ 01.pdf

RAR RUS 10-16 Peter the Great Saint Petersburg Polytechnic University Sokolova Olga falconer87@mail.ru

Polytechnicheskay, 29

The selection of soil models parameters in Plaxis 2D Finite element method is often used to solve complex geotechnical problems. The application of FEM-based programs demands special attention to setting models parameters and simulating soil behavior. The paper considers the problem of the model selection to describe the behavior of soils when calculating soil settlement in the check task, referring to complicated geotechnical conditions of Saint Petersburg. The obtained settlement values in Linear Elastic model, Mohr – Coulomb model, Hardening Soil model and Hardening Soil Small model were compared. The paper presents results of calibrating parameters for a geotechnical model obtained on the data of compression testing. The necessity of prior calculations to evaluate the accuracy of a soil model is confirmed. 10.5862/MCE.48.2 computational modeling calibration model parameters Mohr – Coulomb model Hardening Soil model https://engstroy.spbstu.ru/article/2014.48.2/ 02.pdf

RAR RUS 17-27 Peter the Great Saint Petersburg Polytechnic University, PRDI “Venchur” Ulybin Alexey ulybin@mail.ru

Polytechnicheskay, 29

Peter the Great Saint Petersburg Polytechnic University Zubkov Sergey svzubkov@mail.ru

Polytechnicheskay, 29

LLC "OZIS-Venture" Fedotov Sergey fed87@mail.ru

4/1 Vavilovyh St., St. Petersburg, Russia, 195257

Peter the Great Saint Petersburg Polytechnic University Zakrevsky Aleksandr slice39@mail.ru

Polytechnicheskay, 29

Inspection of pile foundation before constructing additional storeys оn existing buildings The problem of constructing additional storeys on existing buildings is really up-to-date nowadays. Implementation of the above-mentioned process should be undertaken after the inspection of constructions. Foundation is the construction which takes additional loads. The inspection of constructions, which are located underground, i.e. piles, is a very complicated technical problem. This article considers the full inspection of the pile foundation, analysis of mistakes in the geological survey and ways of their elimination. The results of determining a bearing capacity of piles were described using three different methods: calculation, static penetration test, in-situ load tests were compared. The paper shows the essential difference between the results obtained by using different methods. The analysis of the survey’s results contributes to drawing up recommendations on the methodology of the pile foundation complex inspection. 10.5862/MCE.48.3 inspection of buildings excavation of test pits bearing capacity of piles construction of additional storeys https://engstroy.spbstu.ru/article/2014.48.3/ 03.pdf

RAR RUS 28-38 JSC “B.E. Vedeneev VNIIG” Stanislav Solsky solsky@yandex.ru “Atomenergoproekt” JSC Novitskaya Oksana o_novickaja@so2.spbaep.ru “NPK Proektvodstroi” LLC Kubetov Stanislav skubetov@proektvodstroi.ru Evaluating the effectiveness of drainage and impervious elements of concrete dams on bedrock (on example of Bureyskaya HPP) The proposed technique allows estimating the efficiency of individual elements of hydraulic structures that perform similar functions and work together, and determining the impact of their current state on the entire structure performance. The technique was elaborated for a separate evaluation of drainage and impervious elements of bases of concrete dams on bedrock when they work together. To implement this task, the authors used the method of numerical simulation (modeling) and comparisons with field observations data, which allowed calibrating the ground model. The technique was tested on one of the gates at Bureyskaya HPP, and the influence of drainage and impervious elements effectiveness upon the backpressure on the base of the concrete dam was estimated. The result of these studies allows the authors to suggest appropriate safety criteria K1 and K2. It should be noted that the developed technique allows giving priorities in determining the composition and volume of the repair and / or reconstruction of hydraulic structures elements. 10.5862/MCE.48.4 drainage grout curtain efficiency impact estimation safety criteria concrete dams https://engstroy.spbstu.ru/article/2014.48.4/ 04.pdf

RAR RUS 39-48 “B.E. Vedeneev VNIIG” JSC Badenko Nikolay badenkonv@vniig.ru "Institute Hydroproject" JSC Vaksova Evgeniya hydro@hydroproject.ru “B.E. Vedeneev VNIIG” JSC Ivanov Timofey ivanovts@vniig.ru "Institute Hydroproject" JSC Lomonosov Aleksey a.lomonosov@hydroproject.ru Peter the Great Saint Petersburg Polytechnic University Nikonova Olga olganikonova@yandex.ru

Polytechnicheskay, 29

Research center "Kronshtadt" Petroshenko Maksim MaxPetroshenko@gmail.com Detecting prospective regions in the Russian Federation for hydroelectric development based on analytic hierarchy process The aim of the article was to describe the method of detecting the prospective regions in the Russian Federation for hydroelectric development. The method is based on Analytic Hierarchy Process (AHP). According to the method, every region is estimated by a decision-maker. The authors of the method elaborated 23 criteria, characterizing the electric power generation and consumption, the current economic and sociodemographic conditions of the regions and also their forecasting. The regions were estimated by these criteria. Data for this study were collected from the Russian Federal State Statistics Service, Federal Subjects Development Programs and Power Industry Development Programs for regions. As a result of this method, every estimated region gains a status: prospective, normally prospective and non-prospective for hydroelectric development. The results can be applied to calculate the economic hydroelectric potential. The method was tested for detecting the prospective regions of the Volga Federal District, North Caucasian Federal District, Northwestern Federal District, Siberian Federal District for hydroelectric development. 10.5862/MCE.48.5 renewable energy hydroelectric potential prospective region geographical information system Analytic Hierarchy Process (AHP) decision support hydropower plant hydroelectric development https://engstroy.spbstu.ru/article/2014.48.5/ 05.pdf

RAR RUS 49-62 6602848417 0000-0002-0587-4722 National Research Moscow State Civil Engineering University Kantardgi Izmail kantardgi@yandex.ru Institute of Marine Geology and Geophysics FEB RAS Kuznetsov Konstantin konstantin.kouznetsov@gmail.com Field measurement of waves for defining loads on marine hydraulic structures In accordance with the current Russian normative documents, determining wave loads and impacts on hydraulic structures should be calibrated by field measurements and laboratory studies. However, it is problematic to satisfy this norm, because there are no measured wave parameters for the main coastal areas. Moreover, the equivalent virtually designed waves cannot be compared directly with the measured real ones. The situation may be improved by the method of reanalyzing meteorological conditions for the region within 30–50 years and then modeling dangerous storms. The method of reanalysis has been applied for the coastal zone in Imeretinskaya Lowland in Sochi to develop the coastal protection structures. The calculated waves have been compared to the existing buoy measurement (Gelendzhik) and coastal wave station’s measurement (Sochi). It is advisable to take field measurement of waves with near-bottom pressure gauges. They are acceptable for complicated conditions. Surface waves are calculated by wave theory. 10.5862/MCE.48.6 wave loads on hydraulic structures calibration field measurements method of reanalysis Imeretinskaya Lowland near-bottom pressure gauges https://engstroy.spbstu.ru/article/2014.48.6/ 06.pdf

RAR RUS 63-71 Peter the Great Saint Petersburg Polytechnic University Shkhinek Karl karl-1303@mail.ru

Polytechnicheskay, 29

Structures vibration induced by ice action Ice induced vibration of fixed offshore structures has been observed in different seas, for example, Beaufort Sea, Cook Inlet, Gulf of Bothnia, Bohai Gulf, Sea of Okhotsk, Caspian Sea. It can have a significant impact, as it may lead to failure due to structural fatigue (Bohai Gulf) or softening foundations, or cause problems with the serviceability of platforms. The experimental works have been conducted for a long time and give results which can be used only for conditions corresponding to the experiment. Moreover, approximate analytical solutions have a limited area of application, because of complexity of the phenomenon. A 2D solution for the numerical study of ice-induced vibration of vertical-sided fixed offshore structures based upon the discrete elements method has been developed by Saint Petersburg State Polytechnical University. The results of the comprehensive numerical analysis have been presented by authors to determine the main parameters of the environment and construction which influence the phenomenon. 10.5862/MCE.48.7 structures vibration velocity natural frequency reaction ice action https://engstroy.spbstu.ru/article/2014.48.7/ 07.pdf

RAR RUS 72-88 CJSC GT Morstroy Salganik Evgeniy salganikea@mail.ru Peter the Great Saint Petersburg Polytechnic University Shkhinek Karl karl-1303@mail.ru

Polytechnicheskay, 29

Ice induced vibrations of offshore structures The aim of the article was to analyze the process of the dynamic interaction between ice and offshore structures and find conditions of vibration beginnings. The problems of creating a full-scale finite element model of ice and offshore structure interaction and comparison of the received results of vibration conditions with the field data were solved. Modeling was realized with the finite element analysis software ANSYS. The problems of modeling cracks formation, checking the multilateral model using basic ice strength tests and finding ice loads level on different types of structures were solved in order to create a destructible ice model. The object of the investigation is the role of elastic and inertial offshore structure parameters and geometrical and dynamical ice field parameters in the process of ice-induced structure vibrations. Molikpaq drilling and oil production platform in Canada and Norströmsgrund lighthouse in Sweden were chosen as objects for modeling. The research contains verification of the results, their comparison to field data, load magnitudes from ISO 19906 «Petroleum and natural gas industries – Arctic offshore structures» algorithm and results of discrete element modeling. The results are acceptable in comparison with the results of other iceinduced vibration research. 10.5862/MCE.48.8 vibration ice load offshore structures fracture mechanics computer simulation finite element method ANSYS https://engstroy.spbstu.ru/article/2014.48.8/ 08.pdf