IMPROVEMENT OF THE HIGHER EDUCATION SYSTEM IN THE ROAD SECTOR OF THE RUSSIAN FEDERATION
Chairman of the Technical Committee
for Standardization № 418 «Road management»,
President of «R.O.S. ASPHALT»,
Ph. D. (Tech.) N.V. Bystrov
Contact information: +7(495)211-07-48; info@rosasfalt.org
Abstract:The article deals with the issues of quality and improvement of the higher education system in the road sector. Based on the analysis of the state of road higher education, shortcomings in the system of training of the higher education graduates have been revealed. Specific directions for the development of professional road education are proposed, including the need to create an educational and methodological center for road education.
AN EFFICIENT STAKING METHOD OF BICLOTHOID CONJUGATION WITH A CIRCULAR INSERT FROM THE CURVE MIDDLE
Ph. D. (Tech.), Associate Professor S.P. Paudyal
(Moscow Automobile and Road Construction
State Technical University (MADI))
Contact information: suprapa@mail.ru
Abstract:Staking road curves with the conjugation of transition curves and circular inserts is usually carried out from several points – from the vertex of the angle, the beginning and end of the rounding and other points. However, for large values of the radius and turning angle it is a very time-consuming process.
When designing the road routes, among the range of several methods, the most widely used one is the «unambiguous axis determination» method, based on the principles of tangential axis design.
According to the regulatory documents, requirements are imposed for ensuring the safe and convenient movement of the vehicle. In almost all countries of the world, clothoid segments with different parameters in combination with circular inserts are used as the transition curves. However, the possibility of searching and developing new methods has not been exhausted.
The article proposes a new method for staking the curves of the route plan by biclothoids with a circular insert from one point – from its middle in order to significantly increase the accuracy and reduce the time consumption for staking out.
Keywords:Road, clothoid tracing, clothoid transition curves, circular insert, staking of clothoids and circular insert, vertex of the turning angle, system of polar coordinates.
Abstract:The destruction of roads as well as the decrease in their service life is usually caused by traffic of heavy vehicles, the axial loads of which have an increased destructive effect on the road structure, resulting in significant damage, particularly during periods of reduced strength. As known, during the spring period soil moisture increases significantly, consequently the reduction of the subgrade bearing capacity is occurred. In order to prevent premature destruction of road structures, there is a practice of introducing temporary restrictions that entails reducing permissible values of vehicle axial loads. In view of this, the determination of the spring thaw period to high precision is important. This article analyzes the measurement results of the road structure water-thermal regime and structures strength. Thus, the validity of using coefficients based on the summation of average daily air temperatures as a generally available indicator of the dynamics of climatic conditions has been confirmed. Based on the above analysis, the procedure for determining the boundaries of the spring thawing period of subgrade is proposed.
Keywords:Temporary restriction, soil moisture, road pavement, strength of road pavement, bearing capacity of subgrade soil.
PILOT AND EXPERIMENTAL IMPLEMENTATION OF INNOVATIVE DEDUSTING TECHNOLOGY ON INTERMEDIATE AND LOW TYPES ROAD SURFACE
Doctor of Engineering, Professor A.V. Kochetkov,
Engineer I.V. Chancev
(FAI «ROSDORNII»),
Engineer S.G. Merkushov
(«ZIRAX» LLC),
Engineer E.S. Hudoleeva
(«NIIPAV» LLC SPA)
Contact information: soni.81@mail.ru
Abstract:The article discusses the results of work on the pilot and experimental use of innovative dedusting materials based on anhydrous calcium chloride and 6-agueous magnesium chloride with a water-soluble multifunctional amine group surfactant.
INFLUENCE OF CHEMICAL SALT ADDITIVES ON THE AMOUNT OF FROST HEAVING OF THE ROAD SUBGRADE SOILS
Ph. D. (Tech.) S.A. Myasnikova,
Doctor of Chemistry V.A. Shorin,
Ph. D. (Tech.) A.Y. Velsovskij
(Vologda State University (VoSU)
Contact information: lana-m-11@mail.ru; ad@vogu35.ru
Abstract:The article deals with the research of chemical salt additives influence on the frost resistance of the road structure. The methods and technologies for introducing salt additives into the soil are given. The soil preparation treated with salt additives for frost heaving testing is considered. The kinetics of the frost heaving processes of the benchmark soil and the soil treated with salt additives has been studied. The type and concentration influence of salt additive on the degree of frost heaving of soils is examined. Correlative relations of the chemical salt additives influence on indicators of soil frost heaving are revealed.
Abstract:The article presents the problem solution of identifying weakened zones (areas of increased moisture, materials disintegration or decompaction, settlements, etc.) in road pavement structural layers. The use of different automated image recognition algorithms (attribute analysis methods together with the computer vision tool) in georadar data processing and interpretation helps to quickly enough detect heterogeneous areas on radarograms that correspond to weakened zones in base underlayers of road pavement.
Abstract:The article considers the aspects of GPR application in close connection with the precise geodetic referencing methods when working in the conditions of dense urban area. Batch processing with the use of algorithms of attribute analysis is used for the interpretation of volumetric data sets. For visualization and presentation of data the GIS technology is used.
IMPROVEMENT OF THE METHOD FOR ASSESSING THE FATIGUE CRACKS CHARACTERISTICS IN WELDED METAL STRUCTURES OF BRIDGES BY THERMAL METHOD
Ph. D. (Tech.), Associate Professor L.Yu. Solovyov,
Postgraduate student V.A. Fedorenko
(Siberian State Transport University (SSTU))
Contact information: lys111@yandex.ru; sky.97@bk.ru
Abstract:The article deals with the research of the possibility of using infrared thermography to control the fatigue crack length and determine the true position of its tip. Based on the accumulated experience and analysis of the results obtained, the authors present the key characteristics of the equipment used, which must be taken into account for the effective use of the thermal control method. On the comparative analysis basis of the most commonly used methods of non-destructive testing used as a part of the inspection of welded steel spans for diagnostics fatigue cracks, the significant advantages of the modern method of infrared thermography are shown. The thermal method effectiveness has been revealed when fixing the actual location of fatigue crack tips in laboratory conditions; this has also been confirmed on operational bridges in the field.
ANALYSIS OF BRIDGE STRUCTURE FAILURE DUE TO THE NEGLIGENCE OF ITS CONSTRUCTION STAGING
Ph. D. (Tech.), Associate Professor I.I. Ovchinnikov
(Yuri Gagarin State Technical University
of Saratov (SSTU)),
Ph. D. (Tech.), Professor Sh.N. Valiev
(Moscow Automobile and Road Construction
State Technical University (MADI),
Post-graduate student O.N. Gerasimov
(Yuri Gagarin State Technical University
of Saratov (SSTU)),
Doctor of Engineering, Professor I.G. Ovchinnikov
(Industrial University of Tyumen (IUT)),
Graduate Student I.R. Gasanov
(Yuri Gagarin State Technical University
of Saratov (SSTU))
Contact information: bridgeart@mail.ru; vshn2014@gmail.com; oleg96-2011@mail.ru; bridgesar@mail.ru; bridge899@mail.ru
Abstract:The article deals with the problem concerning bridge structures failures. The state of the problem is briefly analyzed according to domestic and foreign literature sources and it is noted that insufficient attention is paid to the failure rate of bridge structures. Then, the analysis of a bridge structure with a steel-reinforced concrete span in the Republic of Dagestan in the process of its construction due to the negligence of the construction staging is given. In the process of computational analysis, it has been found that the main cause of the overpass span failure is the discrepancy between the technology of concrete laying and the stability of the designed bridge steel structures elements. It is specified that the received results of the computational analysis are in full compliance with the picture of destruction defined during the inspection of the bridge structure after the accident.
Keywords:Bridge structure, steel-reinforced concrete span, failure, construction staging, computational analysis.
CALCULATION METHOD AND APPLICATION PRACTICE OF RETAINING WALLS OF BLOCKS WITH GROUND FILLER
Ph. D. (Tech), Associate Professor N.Y. Tsimbelman,
Postgraduate student I.V. Kuzovatkin
(Far Eastern Federal University (FEFU)),
Director General Ya.I. Kotyk
(«Zahar» LLC),
Design engineer D.Yu. Ivannikov,
Director General V.N. Babkin
(«KorBet» LLC)
Contact information: d.ivannikov@korbetstroy.ru; info@korbetstroy.ru
Abstract:This article examines the calculation sequence and provides implementation examples for a retaining quickly erectable structure design having increased dynamic load resistance, as well as aesthetic appeal at comparatively low cost. The retaining structure represents a stepped semi-gravity type construction in which the joint work of ground-filled blocks is provided by friction forces due to compacted ground infill inside each one of the blocks and the formation of a compacted foundation of the structure which prevents ground failure. The considered structure possesses a range of advantages including rapid mounting (as well as the possibility of dismounting while maintaining the integrity of basic elements), lack of «wet» processes during construction, structural flexibility and comparatively high dynamic load resistance. The solving the problem of creating a computational modeling method for retaining structures with a complex-shaped pressure face consisting of blocks without rigid constructive connection and filled with granular material will allow to provide a sufficient computational substantiation for the use of considered structure in transport construction facilities, as well as a part of bridge abutments and road embankment reinforcement.
PREREQUISITES FOR IMPROVING THE EFFICIENCY OF THE DRAINAGE PIPES CAPACITY ON BRIDGE STRUCTURES
Engineer, Senior Lecturer N.A. Novikov
(Moscow Automobile and Road State
Technical University (MADI))
Contact information: kaman_job@inbox.ru
Abstract:The peculiarities of the installation and operation of stormwater inlets in the form of drainage pipes used on bridge structures are described. The existing researches on determining the capacity of various stormwater inlets are considered. The analysis of the energy state of the stormwater flow moving in the drainage near-edge roadway gutter and its effect on the drainage pipes operation is presented. A number of methods have been proposed to increase the capacity of a drainage pipe located on a section with a longitudinal slope. The constructive solution, which is one of the most convenient for use in the practice of construction and operation of bridge structures, is highlighted and justified by comparative calculation.
Keywords:Drainage pipe, stormwater inlet, operation of stormwater inlets in low sites, operation of rainwater basins on a section with a slope, flow energy state, capacity, bridge structure.
Abstract:The article concerns the use of the method for vibration control of technical condition of bridge structures as applied to bridge spans. The peculiarity of the described method is the integration of accelerograms to obtain the displacement values at the measurement point, which allows to determine the stress-strain state of the structure.
An example of testing a metal span of a road overpass is given. The comparison of experimental and theoretical values is carried out: dynamic coefficient, frequency of natural oscillations and vertical displacements.
Abstract:The article considers the requirements for road conditions when introducing an increased speed limit on motorways and highways of the Russian Federation, which are given in the developed national standard GOST R 70124-2022 «Automobile roads of general use. Organization and safety of road traffic on motorways and highways. General requirements». The standard formulates basic requirements for engineering and ensuring road traffic safety in design, new construction, reconstruction and overhaul of motorways and highways.
Keywords:Motorways and highways, road traffic safety, traffic engineering, increased speed limit, elements of facilities, intelligent transport systems.
METHODOLOGICAL ASPECTS OF FURTHER MEASURES TO IMPROVE ROAD TRAFFIC SAFETY IN THE RUSSIAN FEDERATION
Doctor of Engineering, Professor V.D. Kondrat'ev
(Moscow Automobile and Road Construction
State Technical University (MADI)),
Doctor of Medicine, Academician V.V. Lisin
(Russian Academy of Medical and Technical Sciences)
Contact information: k-051310@mail.ru
Abstract:The article considers the main stages of systematic work to improve road traffic safety in the world and in the Russian Federation. The results of purposeful work for the past almost 20 years in the country are given. Innovations which have been realized in activity to increase the protection of road user against road accidents and their consequences are specified. Proposals for further improving road traffic safety have been formulated.
Keywords:Road traffic safety, road accidents, global crisis, federal targeted program, federal project of the national project, United Nations General Assembly, decade of action for road safety, photo and video recording of violations of traffic rules, social risk, transport risk, mobility.
EVALUATION OF THE EFFICIENCY OF THE USE OF ION STABILIZER FOR STRENGTHENING AND PROVIDING FROST RESISTANCE OF CLAY SOILS FOR ROAD CONSTRUCTION
Ph. D. (Tech.) S.A. Myasnikova,
Ph. D. (Tech.) A.Yu. Velsovsky,
Doctor of chemistry V.A. Shorin,
(Vologda State University (VOGU))
Contact information: lana-m-11@mail.ru; ad@vogu35.ru
Abstract:The article deals with the research of the possibility of using the «UNDERBOLD» stabilizer for clay soils of the Vologda region. The effect of the stabilizer on maintaining compressive strength of reinforced soils is shown, which depends on the content of clay particles (type of soil) and can reach 30 % provided that the manufacturer’s recommended technology is applied. The use of the «UNDERBOLD» stabilizer according to the technology proposed by authors (treatment with stabilizer – drying – strengthening with cement) provides an increase in the strength of the strengthened soil after water saturation up to 2 or more times compared to samples without stabilizer. It is shown that when designing a pavement using local clay soils strengthened with the «UNDERBOLD» stabilizer, it is necessary to performing a waterproofing layer, as well as the drainage to increase the efficiency of the structural layer. It is noted that this stabilizer is not a reagent that reduces the phenomenon of frost heave.
Keywords:Soils, road pavement, chemical stabilizer, soil strengthening, frost heave, strength, water resistance.
EXPERIMENTAL AND PRODUCTION RESEARCHES OF ASH AND SLAG WASTE USE IN ROAD CONSTRUCTION
Ph. D. (Tech.), Associate Professor S.A. Chudinov
(Ural State Forest Engineering University (USFEU),
Deputy General Director for Development R.D. Chernyak
(«PROFINTECH» LLC),
Doctor of Engineering, Professor V.N. Dmitriev,
Senior Research Associate O.N. Bayts
(«URALDORNITS» LLC)
Contact information: r.megahim@gmail.com
Abstract:The article deals with the researches results of experimental road sections realized using ash and slag waste in road pavement materials, as well as the assessment of transport and operational condition of such sections. Based on the research results, conclusions about the effectiveness of ash and slag waste use in road construction technologies are done.
Keywords:Ash and slag waste, design, construction, experimental section, road, technology.
MODERN APPROACHES TO MODELING THE AGING OF BITUMEN BINDERS IN THE LABORATORY
Ph. D. (Econ.), General Director E.N. Simchuk
Deputy Head of Reseach_ Laboratory A.V. Kharpaev
Head of Research Laboratory I.M. Rozhkov
(«NII TSK» ANO)
Contact information: niitsk@niitsk.ru
Abstract:The article considers the factors influencing the aging of bituminous materials and reviews the main and advanced methods of their aging. The results of researches, which have been carried out when developing the standard for the methods of aging in a thin layer, are done.
CLIMATE CHANGES AND THEIR IMPACT ON THE OPERATION OF LINEAR AND NON-LINEAR OBJECTS OF TRANSPORT INFRASTRUCTURE
Head of Division A.S. Kuznetsova,
Deputy Director M.V. Kudinkina,
First Deputy Director V.V. Murashov
(FSBI «Research and Analysis Centre for Integrated Transport Solutions» of the Ministry of Transport of the Russian Federation)
Contact information: ask@mintrans.org
Abstract:The article discusses the issues of the impact of global climate changes on transport infrastructure objects and their adaptation to climate change. The data on the change in the number of days with negative air temperatures, the number of air temperature transitions through 0 ºC have been summarized.
In most of the territory of Russia in all seasons of the year there is an increase in the number of days with abnormally high air temperatures and a decrease in the number of days with negative average daily temperatures. The increase of 1,5 times in the number of air temperature transitions through 0ºC is noted.
Keywords:Transport infrastructure, roads, road facilities, climate, average daily air temperature, transition through 0 ºC, adaptation, dangerous natural events.
Abstract:On September 21, 2022, Boris Pavlovich Kutko died suddenly at the age of 74. A wonderful man, a true intellectual, has passed away. Boris Pavlovich's entire career is connected with construction, transport and road industries. The staff of the FAI "ROSDORNIA" is grieving and experiencing the pain of loss in connection with the death of a domestic scientist, an expert in road management and our colleague Kutko Boris Pavlovich.