Magazine of Civil Engineering

RAR RUS 3-8 Kagan Andrey kagan_55@mail. Horkina Zh. - Zueva A. - Urban development monitoring, including the use of information technology --- 10.18720/MCE.35.14 urban development of territories dynamics of urban development reconstruction renovation https://engstroy.spbstu.ru/article/2012.35.1/ 01.pdf

RAR RUS 9-13 Ponomarev Andrey 9293522@gmail.com “KBSM” Public Company Ltd. Guskov V. -

Saint-Petersburg, Russia

“KBSM” Public Company Ltd. Vorontsov V. -

St. Petersburg, Russia

“NTTS PN” Private Joint Stock Company I.V. Ageyev I. -

St. Petersburg, Russia

“NTTS PN” Private Joint Stock Company Kemenov L. -

St. Petersburg, Russia

Petrozavodsk State University Romanov A. 9293522@gmail.com

Petrozavodsk, Russia

Petrozavodsk State University Shegelman I. 9293522@gmail.com

Petrozavodsk, Russia

A new high performance neutron-absorbing materials based on the mineral binder and polymer components This paper concerns the problems of designing the light, fireproof, temperature stable and manufacturable neutron-absorbing materials and also shows the way for solving these problems. In the case of using the Astralenes it is possible to increase the irradiation stability of polymer components of the composite neutron-absorbing materials. In that way it is possible to bring its mobility to the level of self-packed material (R9) with a minimal amount of carboxyl plasticizer (0,16% wt). There is an opportunity to create the new composite having no equal analogs for the combination of properties, including the amount of hydrogen (0,05-0,06 g/cm3) in the wide range of the temperature. It is found that using the modified polymer components in the composite neutron-absorbing material in quantity not exceeding 12% wt does not exclude these compounds from the class of noncombustible materials. For the first time the method of increasing the mobility of working mixture is tested on magnesium matrix with using modified carboxylate hyper plasticizer, that allowed to get a qualification of neutron-absorbing material R9 with amount of modified plasticizer less than 0,16% wt. Neutron-absorbing material, created on the basis of the research, exceeds known analogs in combination of specific weight, manufacturability, fire hazard class and specific content of hydrogen at elevated temperatures. 10.5862/MCE.35.1 fire safety temperature resistance neutron-absorbing materials irradiation resistance Astralenes modified hyperplasticizers self-packed composite https://engstroy.spbstu.ru/article/2012.35.2/ 02.pdf

RAR RUS 14-22 Irkutsk State Technical University Burdonov Aleksandr slimbul@rambler.ru Irkutsk State Technical University Barakhtenko Vyacheslav antivsyo@yandex.ru Irkutsk State Technical University Zelinskaya E. -

Irkutsk, Russia

Irkutsk State Technical University Suturina E. -

Irkutsk, Russia

Irkutsk State Technical University Burdonova A. -

Irkutsk, Russia

Irkutsk State Technical University Golovnina A. -

Irkutsk, Russia

Physical and mechanical properties of composite materials of different compositions based on waste products 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. This type of waste products has never been used for the production of polymer-mineral composites. Depending on the type of ash, its chemical composition and its quantity in the material, we can adjust the properties of the resulting composites. The use of fly ash as a filler will not only make a product less expensive, but it also will reduce development pressure on the environment and improve the physical and mechanical properties of the material. 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. 10.5862/MCE.35.2 fly ash polyvinylchloride filler composite materials radiation safety glass-transition temperature https://engstroy.spbstu.ru/article/2012.35.3/ 03.pdf

RAR RUS 23-28 Peter the Great St. Petersburg Polytechnic University Nguyen Phuong Dzung hatmit_cep@mail.ru

St. Petersburg, Russia

The dependence of the strength properties of soil on its physical state Soils of hydraulic facilities and foundations are basically in the unsaturated state. Strength properties of these soils inside of each building area may be extremely various and should be carefully studied. It especially applies to tropical and arid areas. Soils that are above ground waters can remain in the unsaturated state in the areas with temperate climate. 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. 10.5862/MCE.35.3 strength properties of soil density; moisture water saturation degree triaxial test direct shear apparatus https://engstroy.spbstu.ru/article/2012.35.4/ 04.pdf

RAR RUS 29-34 Peter the Great St. Petersburg Polytechnic University Badanin A. chinnab@mail.ru

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Bugrov A. -

St. Petersburg, Russia

CJSC “EUROMONOLIT” Krotov A. -

St. Petersburg, Russia

The determination of the first critical load on particulate medium of sandy loam foundation The article deals with application problems of the mechanics of particulate media in construction. The main body of the article is devoted the contribution of foreign and Russian scientists to the theory of mechanics of granular environments, first of all, of the author of this theory. 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 full-scale 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. At the end of the article the proposal on continuation of research in this direction and revival of the domestic school of the I.I. Kandaurov theory of particulate media is stated. 10.5862/MCE.35.4 geomechanics theory of soil mechanics mechanics of particulate media https://engstroy.spbstu.ru/article/2012.35.5/ 05.pdf

RAR RUS 35-40 JSC Vedeneyev VNIIG Goldin A. -

Saint-Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nguyen Phuong Dzung hatmit_cep@mail.ru

St. Petersburg, Russia

Plotting the stress-path for unsaturated soil during consolidated undrained tests in stabilometer It is almost impossible to do calculations by the effective stresses for unsaturated soils as excess pore pressure remains unknown. Purpose of this research is to verify experimentally the basic statement of the N.N. Maslov’s theory of density-humidity and Fredlund’s theory of absorption for determining strength properties of binder soils and taking into account calculation of slope stability. Tests of soils taken from the collapsed slope of the Hua-Na Hydropower Station (Vietnam) were conducted in stabilometer in consolidated-undrained 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. 10.5862/MCE.35.5 soil strength water saturation degree triaxial test for unsaturated soils absorption pore air pressure pore water pressure https://engstroy.spbstu.ru/article/2012.35.6/ 05.pdf

RAR RUS 41-48 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

Estimation of the soil body stability Estimation of stability of the soil body is the main objective in the design of structures and foundations. But the laws of mechanics, such as the equilibrium conditions and the boundary conditions are not observed in most methods used for estimating the stability of the soil body. To correct the noted disadvantages, the special method, in which all laws of mechanics are observed, 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. It is established that all these factors significantly effect on the estimating the stability of the soil body. 10.5862/MCE.35.6 stability of the soil body Coulomb criterion equilibrium conditions boundary conditions surface of failure law of normal stress distribution https://engstroy.spbstu.ru/article/2012.35.7/ 06.pdf

RAR RUS 49-58 S-1676-2017 6507460407 0000-0002-8907-7869 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Mirsaidov Mirziyod theormir@mail.ru

39, Kori Niyoziy St., Tashkent, Uzbekistan, 100000

55586710000 0000-0002-6498-5043 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Sultanov Takhirjon tz-sultanov@mail.ru

Tashkent, Republic of Uzbekistan

Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Khodzhaev Dadakhan khodzhaevda@mail.ru Stability evaluation of slopes of earth dams with account of soil rheological properties Numeric model, methods and algorithm to evaluate the strength of earth dams were developed in the paper using Boltzmann-Volterra hereditary theory of viscoelasticity and Rzhanitsyn relaxation kernel. The estimated results of stress-strain state and strength of earth dams under dynamic effects are considered. The basis of this method is finite-element discretization of structure’s model, which leads to solvable system of integral differential equations and further to step-by-step method of its solution. Reliability of worked out algorithms and programs of design was checked by test examples. Study results of stress-strain state of three (different in height) dams under various effects permit to obtain stresses appearing in them and to reveal the most stressed parts of the structure in both resonant and above resonant modes. 10.5862/MCE.35.7 dynamic behavior stress-strain state earth dams strength stability viscosity creeping accelerogram https://engstroy.spbstu.ru/article/2012.35.8/ 07.pdf

RAR RUS 59-69 JSC "B.E. Vedeneev VNIIG" Kaufman Boris KaufmanBD@vniig.ru

St. Petersburg, Russia

Accounting for the impact of uncertain factors on the determination of the hydrodynamic pressure on the dam Issues, related to the clarification of hydrodynamic pressure on arch and gravity dams, were the topic of all last congresses on seismic resistance, because they are directly connected with reliability control of these important facilities. Impact of water pressure on the dam in case of earthquake depends on a number of factors, including vibratory energy absorption by the bottom of the reservoir that plays a significant role. However the determination of the absorption parameter involves considerable difficulties, because it is influenced by properties of a bottom material and alluviums, silt, debris and so on. It makes this characteristic substantially uncertain. Stationary and non-stationary plane problems of hydromechanics for a semi-infinite 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 non-resonance conditions are given. 10.5862/MCE.35.8 dam basis seismic influence hydrodynamic pressure uncertain factors probability theory theory of possibilities https://engstroy.spbstu.ru/article/2012.35.9/ 08.pdf

RAR RUS 70-78 The Institute of Telecommunications and Global Information Space of the National Academy of Sciences of Ukraine Stefanyshyn D. -

Kiev, Ukraine

7801674259 JSC “B.E. Vedeneev VNIIG” Shtilman Vladimir ShtilmanVB@vniig.ru Towards assessing the probability of water overflow across the dam crest According to the Federal law № 117-FZ "On the safety of hydraulic structures", an owner of a hydraulic structure has to develop a declaration of safety of the dam. It should include the potential accident scenarios with assessment of the probabilities of their realization. The methodology of the development of scenarios and the water overflow probability that is one of the basic causes of the emergency situations at the dams is given in the study. The causes of the spillway failure and most frequent events leading to the failures or disturbances of the spillway structures are analyzed. 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. The general form of the event tree “Overflow across the crest” or in other words fault tree that leads to the water overflow across the dam crest is presented. The application of this approach is illustrated by an example of estimating the probability of the scenario of an emergency related to the overflow the reservoir on the Lower Bureya HPP in case of emergency release from the reservoir of the Bureya HPP. The analysis of the fault tree makes it possible to form a logical model of the origination and the development of the complex processes and phenomena leading to the water overflow across the dam crest and permits to make the quantitative and the qualitative analysis of the event with the assessment of the overflow probability. 10.5862/MCE.35.9 dam crest water overflow probability fault tree https://engstroy.spbstu.ru/article/2012.35.10/ 09.pdf

RAR RUS 79-84 JSC “VNIIG im.B.E.Vedeneeva” Albert Yuliy AlbertYU@vniig.ru JSC “VNIIG im.B.E.Vedeneeva” Shulman Sergey Probabilistic assessment of the ground base reliability under the seismic load The article describes the method of probabilistic reliability assessment of the ground bases constructions based on the adaptation of the regulatory assessment methodology and the use of the probability theory. In contrast to the standard (deterministic) methods, probabilistic assessment provides a quantitative expression of the reliability with the random nature of seismic effects and properties of soils. An analysis of the reliability index sensitivity to random changes in the parameters can be simultaneously performed, that reduces the number of random factors in the calculation of reliability. In this paper, the estimated base model is a semi-infinite 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. Next, the apparatus of probability theory is used, which calculates the probability characteristics of the response function (the mean and variance). Subject to the requirements of a normal distribution of the original random variables obtained data allow us to compute probability of the reliable operation of the base. 10.5862/MCE.35.10 reliability ground bases limit state theory regulatory assessment of reliability seismic load quantitative assessment adaptation probability theory estimated base model https://engstroy.spbstu.ru/article/2012.35.11/ 10.pdf

RAR RUS 85-96 JSC Vedeneyev VNIIG Andrianova Elena elena-andrianova@bk.ru

St. Petersburg, Russia

JSC "B.E. Vedeneev VNIIG" Kaufman Boris KaufmanBD@vniig.ru

St. Petersburg, Russia

JSC “VNIIG im.B.E.Vedeneeva” Shulman Sergey Evaluation of the damping effect of the base on the vibrations of the structure (deterministic, probabilistic and possibilistic approach) The solution of problems of dynamic structure interaction with its base is always connected with a problem of uncertainty of initial information. Most of it concerns the properties of the base. A traditional approach to the solution of problem in such conditions is the probabilistic approach. 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. In this paper these methods are used to estimate the outflow of energy from the vibrating structure. The procedure for estimating the impact of different factors on the structure reliability with incomplete or inaccurate initial information is given. 10.5862/MCE.35.11 construction building base vibrations probability theory theory of possibilities https://engstroy.spbstu.ru/article/2012.35.12/ 11.pdf

RAR RUS 97-102 Peter the Great St. Petersburg Polytechnic University Andreyev A. -

St. Petersburg, Russia

“B.E. Vedeneev VNIIG”, JSC Ivanova Tatyana IvanovaTV@vniig.ru

21, Gzhatskaya St., Saint Petersburg, Russia, 195220

Bottom paving as a part of the low pressure culvert erected by the float-on method The widely used low pressure culverts are operated in the drop range between 1.5 and 5.0 meters. They distinguish by the near critical pairing mode of bays: in the downstream the true hydraulic jump does not develop. In this case the undular hydraulic jump develops in the downstream. 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 near-critical 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. 10.5862/MCE.35.12 bottom paving near-critical flows control technology improvement guide elements https://engstroy.spbstu.ru/article/2012.35.13/ 12.pdf

RAR RUS 103-112 6507403952 Peter the Great St. Petersburg Polytechnic University Bolshev Аleksandr bolshev_as@spbstu.ru

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

7102906681 0000-0002-1811-7712 Peter the Great St. Petersburg Polytechnic University Frolov Sergey frolov_sa@spbstu.ru

St. Petersburg, Russia

CDB ME “Rubin” Chernetsov V. -

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Filipovskaya T. -

St. Petersburg, Russia

The damping system for floating caisson of С-1 navigation pass of St.-Petersburg flood protection barrier Floating caisson of navigation pass C-1 is designed for shutdown in case of threat of flooding the main ship canal in St.-Petersburg flood protection barrier. Conditions, in which the floating caisson must work, resulted in creation of a special design. Research results of floating caisson damping system of С-1 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. Soft-landing system of each floating dam involved the groups of hydraulic dampers and supporting structures, equipped with damping elements. The data received by mathematical modeling and by means of physical experiment are stated. The investigation became the basis for the developing and perfecting the floating caisson damping system elements during the ship canal С-1 shutdown. Commissioning tests confirmed the validity of the research results and calculations. 10.5862/MCE.35.13 floating caisson floating dam water level difference sea roughness mathematical modeling experimental research hydraulic damper elastic damper support https://engstroy.spbstu.ru/article/2012.35.14/ 14.pdf