Magazine of Civil Engineering

RAR RUS 12501-12501 57200276743 0000-0002-7003-3022 Moscow State University of Civil Engineering (National Research University) Bedov Anatoly bedovai@mgsu.ru

Moscow, Russian Federation

57190858958 0000-0001-7740-9400 Moscow State University of Civil Engineering (National Research University) Shaposhnikova Yulia yuliatalyzova@yandex.ru

Moscow, Russian Federation

Bearing capacity of steel-reinforced concrete floor elements before the operation period The paper reflects the results of a survey and assessment of the technical condition of steel-reinforced concrete floor slabs using the “Hoesch Additiv Decke®” technology. Poor execution of concreting and reinforcing, lack of combined action between the elements of the slab, various deviations from the project significantly affect the stress-strain state of the steel-reinforced concrete floor. The aim of the work is to study the influence of various factors on the stress-strain state of steel-reinforced concrete floor slabs using the “Hoesch Additiv Decke®” technology before their operation. The main objectives of this study are: assessment of the technical condition of the steel-reinforced concrete floor slab, detection of defects and damage in the elements of the slab; check calculations of strength, deformability and fluctuation of individual elements, taking into account the identified defects and damage; search for the main decisive parameters in the production of construction and installation works, which significantly affect the strength, deformability and durability of the structure. The object of the study is the elements of the combined steel-reinforced concrete floor. The paper considers the influence of various factors on the stress-strain state of a combined steel-reinforced concrete floor before the start of operation. The authors apply the calculation-analytical method of research. The strength of the slab elements is checked using the “Scad Office” program. The verification of the deformability and fluctuation of the overlap is carried out by manual calculation in accordance with current regulations. Results. The authors performed check calculations of the slab elements, taking into account the identified defects and damages, the actual reinforcement and the thickness of the slab. Deficiencies in the construction and installation works and design errors led to a large number of defects in the floor, such as overloading of the slab, the appearance of force cracks in the slab above the beams, excessive deflections of structures, defects in reinforcement and in concreting. It is required to carry out comprehensive measures to strengthen the floor slabs according to a specially developed construction project developed by a specialized organization. Conclusions. The authors give recommendations on ensuring the operational characteristics of the examined bearing elements based on the results of assessing the technical state of the structures. The results of the research can be used in practical work by engineers in the design and construction of steel-reinforced concrete floor slabs, as well as in the examination and assessment of their technical state. 10.34910/MCE.125.1 624.016 combined action condition survey steel-reinforced concrete structures structural assessment stud connector trapezoidal steel profiled sheeting “Hoesch Additiv Decke®” technology https://engstroy.spbstu.ru/article/2024.125.1/

RAR RUS 12502-12502 57190863290 https://orcid.org/0000-0002-0274-0673 Industrial University of Tyumen Maltseva Tatyana maltsevatv@tyuiu.ru

Tyumen, Russia

Industrial University of Tyumen Nabokov Alexander nabokovav@tyuiu.ru

Tyumen, Russian Federation

M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru

Polytechnicheskay, 29

Consolidation of water-saturated viscoelastic subgrade The stress-strain state of the foundations of buildings and structures made of weak viscoelastic soils is considered. The mechanical characteristics of a viscoelastic water-saturated soil base were determined experimentally. A macro sample of soil in a pipe about 1 m high had a water lock on top to create excess pore pressure in the sample. Excessive pore pressure simulated the depth of the sample from the surface. From the experiment, the universal parameter of the kinematic model was determined, and the foundation was calculated. Theoretical data obtained within the framework of a kinematic model considering the viscoelastic properties of the soil are compared with the known Flamant solution and experimental data for a stabilized state of the soil. The deviation of vertical displacements from experimental data is no more than 4 % (one-dimensional case). The deviation of the theoretical solution of the flat Flamant-type problem (considering residual pore pressures) from the known solution of the Flamant problem is 16 %. The proposed calculation method makes it possible to predict the deformation of foundations made of water-saturated viscoelastic soils more accurately than the solution for elastic and elastoplastic soils without the influence of pore pressure. The technique is novel because it allows one to simultaneously consider the soil's residual pore pressures and the soil's viscoelasticity. 10.34910/MCE.125.2 624.1 weak soils water-saturated foundation stresses and deformations soil viscoelasticity consolidation https://engstroy.spbstu.ru/article/2024.125.2/

RAR RUS 12503-12503 University of Transport and Communications Nguyen Dang Phong phongnd@utc.edu.vn

Hanoi, Vietnam

University of Transport and Communications Hoang Nam Binh binhhn@utc.edu.vn

Hanoi, Vietnam

University of Transport and Communications Tran Huy Thiep thiepth_ph@utc.edu.vn

Hanoi, Vietnam

Geological Survey of India Indra Prakash indra52prakash@gmail.com

Kolkata, India

University of Transport Technology Pham Binh Thai binhpt@utt.edu.vn

Hanoi, Vietnam

Impact of roughness elements on reducing flow velocity at outlets of box culverts For culverts on slopes greater than critical, rougher material causes greater depth of flow and less velocity in culverts of equal size. Velocity varies inversely with resistance thus roughness elements resistance is obviously an important factor in reducing velocity at the outlets of culverts on steep slopes to prevent scour in downstream of culverts on roads. The criteria for design directives of new energy dissipaters must provide for sufficient energy dissipation, characterized by simplicity of design, effectiveness of energy dissipation and low construction cost. In this study, two physical models were built with producing roughness elements at the end part of the culverts to evaluate the outlet velocities of high-energy culverts. The results showed that with a slope ranging from 5 % to 13 %, the proposed roughness elements reduce energy dissipation from 48.7 % to 52.9 % for roughness elements without gaps and from 51.6 % to 53.9 % for roughness elements with gaps. This result also indicated that the roughness elements in the sloping box culverts can be used to replace energy dissipater structures in the downstream of the box culverts in the Central region of Vietnam. 10.34910/MCE.125.3 532.5 flow velocity roughness elements box culverts energy dissipaters https://engstroy.spbstu.ru/article/2024.125.3/

RAR RUS 12504-12504 University of Thi-Qar Al-Kinani Ali Majid ali-majid@utq.edu.iq

Thi-Qar, Iraq

University of Thi-Qar Thajeel Jawad K. jawad.thajeel@utq.edu.iq

Thi-Qar, Iraq

University of Thi-Qar Al-Umar Mohammad Hydar mohammad.hydar@utq.edu.iq

Thi-Qar, Iraq

University of Technology Fattah Mohammed Y. myf_1968@yahoo.com

Baghdad, Iraq

Utilizing seismic techniques and dynamic field tests for soil dynamic response prediction in clay soils When evaluating the dynamic response of soil, shear modulus is an essential parameter to consider. In most cases, the shear modulus is estimated using the shear wave velocity (Vs) of the soil as observed in field geophysical testing. Consequently, shear modulus is the main parameter for geotechnical earthquake engineering problems, both quantitatively and qualitatively. Its measuring must be done meticulously. In many cases, however, the shear wave velocity may be predicted using field dynamic tests such as the SPT N-value of soil when direct measurements of Vs are unavailable. There are various empirical formulae that associate soil type and SPT N-value to predict the shear wave velocity. On the other hand, all of these equations are based on several field observations related to specific places and geology. In this paper, different approaches for estimating the actual shear wave velocity measurements from SPT data were clarified and compared. The data of 59 boreholes in Al Nasiriya’s soil investigation were used. The standard penetration test data computations were applied. The current study investigated and possessed shear wave velocity based on Standard Penetration Test (SPT) N-values using the Excel application, then represented it in the Geographical Information System (GIS) and compared it with geophysical exploration. The SPT-Vs correlation generated for Al Nasiriya, Iraq, demonstrated a better degree of fitness for the dataset. There was also a suggestion for a site-specific SPT-Vs connection. On the other hand, most of the SPT-Vs expressions evaluations indicated a valuable predictive ability. 10.34910/MCE.125.4 624 shear wave velocity SPT N-value geophysical measurement GIS https://engstroy.spbstu.ru/article/2024.125.4/

RAR RUS 12505-12505 0000-0003-1892-006X Glavtatdortrans Baimukhametov Gadel baimuhametovi@mail.ru

Kazan, Russian Federation

0000-0001-9927-6100 Glavtatdortrans Gayfutdinov Rustem rustem_iben@list.ru

Kazan, Russian Federation

0000-0003-4227-1733 Kazan State University of Architecture and Engineering Hafizov Eduard edward_76@bk.ru

Kazan, Russia

Calculation of the influence of various compaction on the wear resistance of asphalt concrete using material loss calculation approach Rutting is the most common and most dangerous defect of asphalt pavements. One of the problems of northern countries such as the Russian Federation is abrasive rut due to studded tire loading. Precise prediction of the asphalt concrete abrasion and wear resistance allows improving the durability and reliability of asphalt pavements. Several laboratory tests are used for the prediction of asphalt concrete abrasion resistance. An abrasive wear model of asphalt concrete is needed to predict wear resistance changes under different conditions. The aim of this article is to evaluate compaction quality effect and air voids value on the abrasion resistance of asphalt concrete. To estimate the influence of the percentage of connected voids on abrasive wear of asphalt concrete, an asphalt wear model was presented. This model is based on G.Y. Lee’s approach. This approach divides the abrasive processes into normal abrasion and particle loss. Air voids lead to the aggregate loss and affect the abrasion resistance of the asphalt pavements. Calculation of these effects is possible using G.Y. Lee’s approach. Calculations of the lost particles include the empirical coefficient (1/mm) characterizing the influence of the pores on the lack of adhesion to the aggregate particle surface and the influence of the lack of adhesion on the fraction of lost particles. The Prall test was used for the abrasion resistance estimation. The saturation degree method was used for the estimation of compaction quality and air voids content. For the coefficient estimation, 63 samples of different mixes were tested. The mixes were used for the construction of the Republic of Tatarstan road network. The used asphalt concretes correspond to requirements of Russian standards GOST 9128-2013 and GOST 31015-2002. The experiments show good reliability of the presented model. This model predicts abrasion resistance of asphalt concretes under uncompaction and provides insight into the abrasive wear processes in the asphalt concretes. Furthermore, the study results allow us to improve the laboratory tests precision by 2.3 % by excluding the uncompaction effect during the comparison of the results. 10.34910/MCE.125.5 625.852 air voids asphalt abrasive wear asphalt compaction wear model asphalt pavements experimental investigations wear resistance https://engstroy.spbstu.ru/article/2024.125.5/

RAR RUS 12506-12506 0000-0002-6165-2550 Tunis El Manar University, National Engineering School of Tunis, Civil Engineering Laboratory Hamrouni Facker fakher.hamrouni@gmail.com

Tunis, Tunisia

0000-0002-9430-3920 Northern Border University, Engineering College Jamei Mehrez mehjamei@yahoo.fr

Arar, Kingdom Saudi Arabia (KSA)

Northern Border University, Engineering College Alassaf Yahya ysalassaf@gmail.com

Arar, Kingdom Saudi Arabia (KSA)

Numerical analysis of rainfall-induced slope instability using a reduced-scale model The climatic changes induce now more and more serious environmental problems such as landslides, especially in arid and semi-arid countries where rainfalls happen with high and short duration intensity. This paper aims to study the influence of unsaturated mechanical properties on the slope instability. The research was conducted based on the combination of a physical model and numerical simulations with the aim to analyze rainfall-induced slope failure. The benefits of the proposed method are: 1) increase of monitoring efficiency by considering several parameters in large ranges of variation; 2) cost reduction by a combination of minimal laboratory physical model data and numerical modeling. In this study, the effect of rainfall intensity and duration as a hydraulic loading was investigated. The used model is an elastoplastic one based on effective stresses and a non-associative flow rule. A function of a reduction of mechanical parameters with suction was implemented in CODE_BRIGHT software. The results are presented in terms of: 1) displacement values; 2) evolution of pore water pressure (PWP); 3) plastic deviatory strains and saturation zones. 10.34910/MCE.125.6 624.13 climate changes landslide rainfall finite element modeling unsaturated soil physical model https://engstroy.spbstu.ru/article/2024.125.6/

RAR RUS 12507-12507 YakutPNIS-Commercial Center Matveeva Olga matveeva_oi@mail.ru

Yakutsk, Russian Federation

North-Eastern Federal University named after M.K. Ammosov Baishev Nikolay nbaishev@gmail.com

Yakutsk, Russian Federation

0000-0001-7226-9859 North-Eastern Federal University named after M.K. Ammosov Makarov Andrey andrmakarov16@mail.ru

Yakutsk, Russian Federation

57207737267 0000-0002-7829-6839 Institute of Oil and Gas Problems of Siberian Branch of the Russian Academy of Sciences Popov Aleksandr surrukin@gmail.com

Yakutsk, Republic of Sakha (Yakutia), Russia

JSC Yakutsk State Design, Research Institute of Construction Pavlyukova Irina pavlyukova-irina@mail.ru

Yakutsk, Russian Federation

North-Eastern Federal University in Yakutsk Grigoriev Nikolay matsugauser@mail.ru

Yakutsk, Russian Federation

Enhancing lightweight concrete strength through modified zeolite-alkaline porous aggregate: composition optimization and structural application The work is aimed at research of technology of lightweight concrete with porous aggregate with improved strength characteristics to expand the field of its application in reinforced concrete structures. The lack of demand for lightweight concrete in structural construction is due to its low reliability in view of the increased ultimate deformation of compression and tension. However, as recent studies show, when taking into account the ultimate compressive strain of lightweight concrete, it is quite possible to ensure the reliability of such structures. In order to expand the scope of application of light concretes in bearing layers of multilayered enclosing and bearing reinforced concrete structures, our purpose was to determine the features of the lightweight concrete composition selection technique with improved characteristics using a porous aggregate of modified zeolite-alkaline charge. Empirical equations of dependence of lightweight concrete strength on concrete density and aggregate density as well as dependence of lightweight concrete strength on coarse aggregate volume concentration and aggregate strength were established to determine rational compositions of lightweight concrete. The possibility of producing structural lightweight concrete of strength classes B15 to B27.5, with the frost-resistance mark F₁ 150 with the use of porous aggregate modified zeolite-alkaline batch is shown. 10.34910/MCE.125.7 691.3 lightweight concrete porous aggregate modified zeolite strength characteristics structural application composition optimization https://engstroy.spbstu.ru/article/2024.125.7/

RAR RUS 12508-12508 6507800801 0000-0003-4288-8709 Platov South-Russian State Polytechnic University (NPI) Burtseva Olga kuzinaolga@yandex.ru

Novocherkassk, Russia

57190962075 0000-0003-3708-380X Moscow State University of Civil Engineering (National Research University) Evtushenko Sergej evtushenkosi@mgsu.ru

Moscow, Russia

56099732300 0000-0002-9962-3966 Platov South-Russian State Polytechnic University (NPI) Kokhanenko Viktor kokhanenkovn@mail.ru

Novocherkassk, Russia

Determining parameters of high-velocity open water flow In the planar hydraulics, the problems with previously unknown boundaries are most difficult. The best adequacy in terms of flow parameters is provided by simplified analytical methods based on a potential flow model. A mathematical model of a stationary, potential, 2D planar high-velocity open water flow of an ideal fluid, freely spreading back from a non-pressure orifice is studied. The boundary problem of flow free spreading in plane were formulated. Studying the system of dimensionless equations of motion resulted in identification of the criteria influencing the process of flow spreading. A critical analysis was carried out and a description of various methods for solving the problem of free spreading of a high-velocity water flow was given. The problem in an analytical form was solved in the velocity hodograph plane. All flow parameters are determined in the physical plane. For the first time, the conjugating flow "simple wave" was applied. The proposed analytical method for solving the problem of flow free spreading is effective, unambiguous and has no singularities and discontinuities, particularly, at the outlet of a non-pressure pipe. The adequacy of the mathematical model was verified on a test example. The relative error of the flow parameters does not exceed 10 % compared to the experimental data. 10.34910/MCE.125.8 626.31 mathematical model two-dimensional water flow equations of motion resistance forces open-channel hydraulics analytical solution simple wave characteristics method https://engstroy.spbstu.ru/article/2024.125.8/

RAR RUS 12509-12509 Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy of Sciences Suprun Veronika suprun-v@vfanc.ru

Volgograd, Russian Federation

0000-0001-6490-7072 Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy of Sciences Ustinova Viktoriya ustinova-v@vfanc.ru

Volgograd, Russian Federation

Pilot installation of a biosorption facility on a rice irrigation system The article presents the composition and design of the developed biosorption facility designed to purify drainage and waste water from rice irrigation systems. The object of the study is the Sarpin watering and irrigation rice System (SWIS) located in the semi-desert zone of the Republic of Kalmykia. The studies were conducted and tested in field and laboratory conditions. The composition of the biosorption facility should include at least four stages of purification. The main elements of the biosorption facility design are a settling tank (section 1), a filtration chamber filled with medium-sized crushed stone (20–40 mm) and NDP-600 diatomite powder (section 2), as well as a bioplateau complex (section 3) and a filter chamber with a mixture of sorbents (section 4). The parameters of the bioplateau were calculated and its design was improved by including dampers that provide the necessary contact time of the treated water with higher aquatic vegetation on a smaller area of the structure, increasing the efficiency of purification. A graphical model of the structure was created in the AutoCAD program. Also, the project of the biosorption facility module developed in AutoCAD made it possible to calculate the volume of earthworks and implement them on the SWIS in the Republic of Kalmykia. 10.34910/MCE.125.9 631.6.03 water quality mineralization water purification drainage and waste water bioengineering technology sorbents bioplateau https://engstroy.spbstu.ru/article/2024.125.9/

RAR RUS 12510-12510 Vologda State University Utkin Vladimir UtkinVoGTU@mail.ru

Vologda, Russia

0000-0003-2076-4377 Vologda State University Kosheleva Zhanna koshelevazhv@vogu35.ru

Vologda, Russian Federation

Vologda State University Yarygina Olga

Vologda, Russian Federation

Buckling analysis of piles in solid frozen soils The object of the research is the behavior of axial compressed piles in the foundations on continuous permafrost soils under global warming. There is a degradation of permafrost soils at present. The permafrost layer is vertically divided into two parts: 1) the top, the active layer; 2) the bottom, the frozen mass. The active layer of soil thaws in summer and freezes in winter. Frozen soil behaves as a rock in winter and as a liquid mass on some soil thickness in summer. Accordingly, the surface forces acting on the pile surface in winter time disappear in the entire melted liquid soil layer in summer time. We considered the design of a pile by the condition of the first kind buckling (form) under axial compression. We took into account the conditions when the depth of the base thawing soil increases in the upper part of the pile at the stages of operation (in the summertime of the pile operation). In addition, we considered the calculation of the pile length under the same conditions at a given load on the pile at the stage of its design. To forecast the piles operating time in pile foundations or individual piles during global warming on the Earth, an algorithm for calculating pile length at the design stage is proposed. The paper provides a numerical example of calculating the pile operational life in the solid frozen soil of the foundation in an oil pipeline support. 10.34910/MCE.125.10 624.139 soil bearing capacity solid frozen soil soil thawing axial compression longitudinal bending critical force critical pile length https://engstroy.spbstu.ru/article/2024.125.10/