№ 2 on 2026:

GEOTECHNICAL MONITORING AND TECHNOLOGICAL REGULATION
OF SUBGRADE CONSTRUCTION ON PERMAFROST SOILS

Svyatoslav Ya. Lutsky, D. Sc. in Engineering, Professor, Chief Specialist, Research Center «Heat and Mass Transfer in Construction», IPSS RUT (MIIT), Moscow, Russia, lsy40@mail.ru

Taisiya V. Shepitko, D.Sc. in Engineering, Professor, Acting Director of the Institute of Track, Construction and Structures, Professor, Department of Railway Design and Construction, IPSS RUT (MIIT), Moscow, Russia. ORCID ID 0000-0002-4785-1625, shepitko-tv@mail.ru

Aleksandr M. Cherkasov, PhD in Engineering, Associate Professor, Head of the Department of Transport Construction in Extreme Conditions, IPSS RUT (MIIT), Moscow, Russia, ORCID ID 0000-0002-8233-9803, a.m.cherkasov@rut-miit.ru

Denis V. Epifantsev, Postgraduate Student, Leading Specialist, Research Center «Heat and Mass Transfer in Construction», IPSS RUT (MIIT), Moscow, Russia, epifantsev.d.2000@gmail.com

Abstract. The current problem of scientific support for the development of communication routes in the Arctic is considered. A structure of an integrated technology, geotechnical monitoring and control of technological processes during subgrade construction on high‑temperature permafrost is developed. Monitoring during construction operations and regulation of construction loads includes complementary investigations of mechanical and thermophysical processes occurring in layers of thawing and thawed soils. A methodology for technological regulation and a monitoring framework for the construction of railway subgrade in permafrost regions are proposed. Using sections of the "Northern Latitudinal Railway" as an example, the potential for hazardous cryogenic processes and phenomena to manifest during construction works is demonstrated. The functions of geotechnical monitoring are interrelated with the management of construction load parameters under the supervision of foundation stability and structural integrity The feasibility of including fiber optic sensing cable as a control subsystem in the monitoring system is demonstrated. For regulating and predicting the effect of construction progress on soil conditions, the integration of monitoring functions with construction machinery control systems is promising. Complementary control geophysical and regime observations with modeling of the stress strain state of the subgrade are proposed.

Keywords: permafrost soils, subgrade, monitoring, comprehensive technology

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FEATURES OF SPECIAL SURVEYS OF BRIDGE STRUCTURES

Boris A. Bondarev, D.Sc. in Engineering, Professor of the Department of Building Materials Science and Road Technologies, LGTU, Lipetsk, Russia, ORCID 0000-0001-7194-9270, lnsp-48@mail.ru

Alexander B. Bondarev, PhD in Engineering, Associate Professor of the Department of Building Materials Science and Road Technologies, LGTU, Lipetsk, Russia, ORCID 0000-0002-2902-7528, lnsp-48@mail.ru

Victor P. Yartsev, D.Sc. in Engineering, Professor of the Department of Construction of Buildings and Structures, TSTU, Tambov, Russia, jarcev21@rambler.ru

Vladimir K. Zhidkov, Postgraduate Student, Department of Building and Structure Design, TSTU, Tambov, Russia, ORCID 0009-0007-0681-5226, gidkov_vova_1999@mail.ru

Abstract. This article examines the organization and implementation of special unscheduled surveys of bridge structures to assess their technical condition and determine the feasibility of handling excessive loads. The objectives, tasks, and features of such surveys are described. An example of calculating the bearing capacity and in-kind tests at a specific site (an overpass along Bakinskaya Street in Taganrog) is provided. Diagnostic methods and criteria for permissible deformations are analyzed, as well as the main reasons for the need for unscheduled surveys, including emergency situations and material degradation. Particular attention is paid to the use of modern software and hardware for operational monitoring of bridge conditions and the use of beacons to monitor the development of defects. It is emphasized that such surveys provide a comprehensive picture of the condition of the structure, ensuring its safe operation until major repairs or reconstruction.

Keywords: bridge structure, load-bearing capacity calculation, special survey, structure monitoring, survey, transport and operational condition

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FEATURES OF THE PRODUCTION OF SULFUR ASPHALT CONCRETE MIXTURES
AND QUALITY CONTROL OF RAW MATERIALS AT THE ASPHALT PLANT

Yuri E. Vasilyev, D.Sc. in Engineering, Professor, Head of the Department, MADI, Moscow, Russia, ORCID ID 0000-0002-1634-0152, yu.vasilev@madi.ru

Ulyana O. Menkina, Senior Lecturer, MADI, Moscow, Russia, ORCID ID 0009-0001-6950-9329, uliana.mienkina@mail.ru

Gleb A. Ponarin, Postgraduate Student, MADI, Moscow, Russia, gleb_ponarin@mail.ru

Abstract. The article discusses the technological features of the production of sulfur-asphalt concrete mixtures on the basis of a typical asphalt concrete plant. The relevance of the topic is due to the presence of sulfur surplus in the industry and the need to involve this resource in road construction. Considered the option of production of sulfur-asphalt concrete mixture on mixing units for the production of mixtures by hot technology. Special attention is paid to the adaptation of cyclic equipment, temperature conditions and the sequence of input components, ensuring the homogeneity of the mixture and the environmental safety of the process. The issue of the duration of testing the input control of raw materials and the need for accelerated methods for determining the initial components is considered. Approaches to strengthening the production control of the initial components using express methods for testing bituminous binders are proposed. The calculation of the economic efficiency of using sulfur in asphalt concrete mixtures is given.

Keywords: asphalt production plant, bituminous binder, economic efficiency, environmental safety quality control, express methods, mixing sequence, modified sulfur, sulfur asphalt concrete, temperature regime

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PROCESSING AND USE OF ASPHALT-CONCRETE GRANULATE FOR PREPARATION
OF ASPHALT-CONCRETE MIXTURES

Andrey P. Lupanov, D.Sc. in Engineering, Professor, MADI, Moscow, Russia, abz4@abz4.ru

Vyacheslav V. Silkin, PhD in Engineering, Professor, Dorexpert LLC, Moscow, Russia, vvsilkin@mail.ru

Alexey S. Sukhanov, PhD in Engineering, Associate Professor, Dorexpert LLC, Moscow, Russia, dorexpert@yandex.ru

Alexey V. Silkin, Engineer, ABZ KAPOTNYA LLC, Dzerzhinsk, Moscow Region, Russia, alesilkin@yandex.ru

Abstract. The article discusses the main measures for expanding the production of asphalt concrete mixtures using asphalt concrete granulate. It describes the composition of domestic and foreign equipment for crushing and dosing granulate. The advantages of warm asphalt concrete mixtures with granulate are highlighted, including reduced emissions and fuel savings. The purpose of this work is to justify measures aimed at expanding the production of asphalt concrete mixtures with asphalt concrete granulate. The analysis showed that this requires adjustments to the regulatory framework, the development and implementation of modern equipment for preparing granulate, and the renewal of the fleet of asphalt mixing plants. The results of the study are important for the construction industry, as they provide evidence for expanding the use of asphalt concrete granulate in the preparation of mixtures at asphalt mixing plants. The widespread use of this technology will reduce the cost of road construction and repair, while preserving.

Keywords: asphalt concrete granulate, asphalt concrete mix, environmental safety, granulator

EMPIRICAL ASSESSMENT OF THE LOAD-BEARING CAPACITY
OF STABILIZED FINELY DISPERSED SOILS

Polina M. Loeva, Postgraduate Student, Department of Road Construction and Operation, MADI, Moscow, Russia, P.Loeva@Avtodor-eng.ru

Ekaterina V. Kalenova, PhD in Engineering, Associate Professor, MADI, Moscow, Russia, katerina_k_83@mail.ru

Abstract. The paper considers analytical methods for recalculating the determination of the deformation modulus of stabilized soils through the index of direct bearing capacity (IPI). A calculation algorithm has been tested, including the determination of IPI in the Proctor compaction device and the use of a special formula for loamy soils. To verify the proposed method, comparative calculations were performed using data actually measured at the site, based on the work of D.A. Razuvaev. The results obtained exhibit a considerable error, which necessitates the search for other formulas for a correct assessment of the soil bearing capacity. Considered an example of the actual elastic modulus values after the operational period for both laid stabilized soil and untreated soil (without additional soil improvement technologies). A hypothesis is proposed for further work: to develop a database of statistical field data for subsequent consideration in the design of non-rigid pavements.

Keywords: deformation characteristics, recalculation of the modulus of elasticity, index of direct bearing capacity, stabilization of loam

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FEATURES OF ENGINEERING-GEOLOGICAL CONDITIONS
OF THE SEVEROMUYSKY TUNNEL AREA (ending)

Sergey L. Filippov, Engineer, PoliEco LLC, Moscow, Russia, transport-stroy@mail.ru

Abstract. Engineering-geological conditions of the proposed route of the second Severomuysky tunnel are characterized by high seismicity, the presence of numerous zones of tectonic faults with disintegrated soils and significant levels of hydrostatic pressure. In seismically active areas, the complex of special surveys for the design of tunnels cannot be the same not only in different seismogenic zones, but also in the same seismic region, which must be taken into account during the construction of the second Severomuysky tunnel.

Keywords: earthquakes, faults, granites, groundwater, magnitude, power, points, seismic activity, Severomuysky tunnel, surveys

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ANALYSIS OF THE RETAINING CAPACITY OF SHEET PILES
DURING URBAN ROAD CONSTRUCTION UNDER SEISMIC CONDITIONS

Darya V. Leyer, PhD in Engineering, Associate Professor, Head of the Department of Bases and Foundations, Kuban State Agrarian University named after I.T. Trubilin, Krasnodar, Russia, dasha_leyer@mail.ru

Denis A. Chernyavsky, PhD in Engineering, Associate Professor, Kuban State Agrarian University named after I.T. Trubilin, Krasnodar, Russia, asp_projekt93@mail.ru

Alexander Vitalievich Nikolaichuk, PhD in Geography, Associate Professor, Kuban State Agrarian University named after I.T. Trubilin, Krasnodar, Russia, geomor@rambler.ru

Diana Borisovna Latipova, student, Kuban State Agrarian University named after I.T. Trubilin, Krasnodar, Russia, diana.2005.30@mail.ru

Abstract. In seismically active regions, ensuring the stability of temporary retaining structures is a critically important task. Sheet pile walls used for excavation stabilization must withstand not only static but also dynamic loads, including seismic vibrations, which directly affects the safety of construction operations. This paper presents an analysis of methods for ensuring the seismic resistance of sheet pile enclosures during road construction in densely built-up areas (using the example of Krasnodar). The main objective of the study was to assess the stability of Larsen L5-UM sheet pile structures under special loads, including seismic impacts of intensity 7. As part of the research, design models for sheet piles of 8 m and 15 m length were developed and analyzed; the performance of the structures under basic and special load combinations was evaluated in accordance with the requirements of SP 14.13330.2018 and ODM 218.2.006-2011; changes in key parameters of the structure and soil under seismic loading were analyzed.

Keywords: sheet pile walls, seismic stability, dynamic loads, safety factor, geotechnical calculations, urban construction, numerical modeling

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ENHANCEMENT OF SKID RESISTANCE OF CEMENT CONCRETE PAVEMENTS
IN TUNNEL STRUCTURES

Viktor V. Ushakov, D.Sc. in Engineering, Professor, Head of the Department of Road Construction and Maintenance, MADI, Moscow, Russia, kafedra_sed@mail.ru

Daniil S. Keo, Master’s Degree student of the Department of Road Construction and Maintenance, MADI, Moscow, Russia, kafedra_sed@mail.ru

Abstract. This study addresses the problem of traffic safety in tunnel structures with concrete pavements. The research aims to substantiate the necessity of measures to enhance skid resistance of road surfaces in tunnels. The methodology includes statistical analysis of traffic accidents in eight tunnels along the A-148 "Dubler Kurortnogo Prospekta" highway (Sochi, 2014–2025); evaluation of factors influencing the friction coefficient (condensation, temperature fluctuations, and ice formation). Results indicate that 63 accidents occurred in the studied tunnels, including 9 fatalities and 68 injuries. The primary cause was identified as the abrupt change in skid resistance at transition zones between asphalt approaches and concrete pavement inside tunnels. The study justifies implementing specialized measures: increasing surface roughness (diamond grinding, aggregate exposure), installing heating systems for portal zones, and employing specialized maintenance equipment to ensure operational safety of tunnel roadways.

Keywords: cement concrete pavements, road pavement, traffic safety, tunnel structures

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MATHEMATICAL MODEL FOR CALCULATING RAINFALL RUNOFF FROM A ROAD SURFACE

Irina A. Purkina, Postgraduate Student, Department of Road Surveying and Design, MADI, Moscow, Russia, airina9093@gmail.com

Abstract. Currently, when designing road surface drainage, calculations of maximum flow rates and hydraulic flow parameters are performed for individual cross-sections or points. These calculations use calculation relationships for uniform fluid flow, whereas in reality the flow is non-uniform, with mass increasing along the length. This article proposes a mathematical model for calculating rainfall runoff along road surfaces, based on the combined finite-difference solution of the equation for non-uniform fluid flow with increasing mass along the length and the continuity equation. The computer program developed on this basis will allow for the consideration of actual water flow conditions and the determination of hydraulic characteristics at multiple points with a specified step over long sections, thereby increasing the accuracy of hydraulic characteristic calculations and the reliability of design solutions.

Keywords: mathematical model of rainfall runoff on the road surface, the depth of the water layer and its velocity on the road surface, equations of non-uniform fluid motion and continuity

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