bluuebunny/crossref_metadata_2025_split huggingface dataset:
Algorithm for neural network regeneration of labor costs based on the assessment of relevant construction data
Authors: Babakr Hussein Khoshnaw Yousif , Bolotin Sergey , Bagulya Valeriya , Bohan Haitham 
Published: July 2020

Abstract
In the scheduling of construction production, which is an integral function of the organization of construction, the task often arises of choosing adequate labor costs. There is an obvious way to solve this problem - this is the use of previously developed databases. However, its implementation requires the creation of such reference standards by which an adequate choice can be made. On the other hand, creating an entirely new labor base will require even more time and resources. In order to reduce all costs associated with the creation of the database, a neural network algorithm for the regeneration of labor costs is proposed based on the assessment of relevant data, which can be formed on the basis of executive documentation for completed construction projects and for organizations involved in their implementation. As a result, the regenerated norms of labor costs are based on the secondary use of statistics fixing actual labor costs.
Management of construction prices in vietnam under market orientation In the period of international integration
Authors: Doan Duong Hai , Dinh Dang Quang , Do Huu Khoa , Dang Thi Hong Duyen , Nguyen Dinh Hieu 
Published: July 2020

Abstract
Different from countries with long-standing market economies, Vietnam and the Russian Federation are both transitioning from a centrally-planned economy to a market economy, so the determination of the state role in construction price management is particularly important. In Vietnam, the system of construction cost norms, issued by Vietnamese government applied throughout the country, is obsolete and does not keep pace with the development of construction technologies, leaving a huge gap in practice.
In developed countries, the collection and establishment of construction price data are based on detailed unit prices finished construction contracts, official published national statistics, and annual reports from professional associations and businesses.
This paper surveys literature review on the topic of construction price management and analyses, current situation and construction price formation in Vietnam which contributes to innovating the way of forming and managing construction prices in the direction of market and international integration.
Contract Form for Building Information Modelling (BIM) Projects Applied on Construction Industry in Vietnam
Authors: Tuan Hai Dinh , Nam Trung Nguyen , Dieu Huyen Khuat 
Published: July 2020

Abstract
Building Information Modelling (BIM) is a process supported by various tools, technologies and contracts involving the generation and management of digital representations of physical and functional characteristics of places. In general, BIM is researched and applied in many different fields related to construction investment projects. This paper focuses on analyzing the trends of the world in establishing BIM contract terms and assessing the sample of construction contract form in Vietnam piloted BIM. As a result, it proposes next steps for contract terms in projects using BIM in near future in Vietnam.
The blockchain technology in real estate sector: Experience and prospects
Authors: Pankratov Evgeny , Grigoryev Vladimir , Pankratov Oleg 
Published: July 2020

Abstract
Based on the study of existing practice and specific examples of the use of innovative blockchain technology in real estate transactions and its management, the article gives the basic concepts of this technology, analyzes foreign and domestic experience of its application, examines its sphere of use in the real estate market, substantiates main advantages and shortcomings, as well as the process of various mechanisms for financing real estate transactions. It was revealed that when using the blockchain system, all real estate transactions proceed faster, safer and cheaper. Thus, the objectives of the article include studying and summarizing the Russian and foreign practices of using blockchain technology, as well as determining the main ways and options for its further development and improvement, as a highly effective and promising financial and economic mechanism for participants in real estate transactions.
Resource assessment of large-block construction of NPP
Authors: Morozenko Andrey , Shashkov Alexey 
Published: July 2020

Abstract
This article explores the features of the use of prefabricated-cast-in-place structures in the construction of nuclear power plants (NPPs), the organizational and economic feasibility of using prefabricated-cast-in-place structures in the implementation of new projects for the construction of nuclear power plants. Modern technological solutions of prefabricated-cast-in-place structures are presented. The organizational and technological features of the use of large-block construction of nuclear power plants in the implementation of foreign projects are identified. Estimated labor and resource costs for the manufacture of large-block structures for the reactor building of nuclear power plants. The dependence of labor costs for the industrial production of reinforcement blocks is obtained, depending on the share of the use of reinforcement blocks in the construction of the reactor building of nuclear power plants. The basic daily resource costs for the production of reinforcement blocks are analytically calculated.
Information technology application in the construction project life cycle
Authors: Kuzina Olga 
Published: July 2020

AbstractDevelopment management models of object information base are necessary for definition the volume of resources and construction object cost at each stage of building life cycle taking into account the existing requirements to definition each type of cost at stages from PRE-BIM to RE-BIM. To develop and implement the cost management system of the object in the construction industry, it is necessary not only to determine the main levels and parameters of choice when taking into account decisions from the organizational and technological documentation, but also to build an architecture of application software based on artificial intelligence for the operation of the management system at all subsequent stages of the life cycle of the construction object. It is important to determine the main factors influencing on the process of decision-making, and the parameters of the formation of input and output data for modelling each stage of the life cycle of the object, as well as technical and economic indicators of the information model by stages. The diversity of digital technologies opens new possibilities for every project and the cost model help to connect the processes throughout project lifecycle.
Assessment of the safety of Rogun HPP dam in case of seismic impacts
Authors: Orekhov Viatcheslav , Alekseev German 
Published: July 2020

Abstract
The article considers the problem statement and the results of numerical studies of the formation of the stress-strain state of the rock-earthfill dam of the Rogun HPP under seismic impacts. In this case, the static stress-strain state of the dam is considered as the initial state. The purpose of this work is to assess the seismic stability of an ultra-high dam being built in a mountainous area with high seismicity. To study the stress-strain state of a rock-earthfill dam, we used a method based on the finite element solution of a system of differential equations for the dynamic theory of consolidation of quasi-two-phase ground media. To describe the nonlinear deformability of soil materials composing the body of the dam, we used a mathematical model formed in the framework of the theory of plastic flow with hardening. The calculations were performed in a spatial setting, taking into account the speed of propagation of the impact in the rock base. Packages of 3-component accelerograms synthesized for dam construction conditions were used as seismic effects in the calculations. To assess the safety of the rock-earth dam in case of seismic impacts, a calculation was made for the most dangerous impact when the strength characteristics of the dam body materials were reduced by 1.08. As shown by the results of the calculations in this case, after seismic excitation is not observed the appearance in the body of the dam areas of marginal soil conditions, the value of the total reserve coefficient is greater than the minimum standard value for a special combination of loads and seismic stability of the rock-earthfill dam is provided.
Numerical modeling of the controlled lifting of the structure
Authors: Bestuzheva Alexandra , Chubatov Ivan 
Published: July 2020

Abstract
The numerical simulation of the stress-strain state of the soil mass at the base of the settled foundations of structures with the aim of predicting the possibility of their rise by the method of compensating directed discharge is based on the developed finite element method (FEM) program, verified on a number of test problems. The verification results are compared with the decisions of O. Zenkevich [ p. 3], with analytic solutions of V.G. Rekacha [p. 5] and G. Lame [p. 6]. Comparisons of the results of a numerical solution of the inverse Lame problem are presented. The error in the results of the comparisons does not exceed 0,5 %. In the framework of the linear theory of elasticity, inverse problems have been solved for obtaining displacements on the day surface of the soil at the base of the foundation of the structure with targeted injection of self-expanding mixtures in the thickness of the soil base. The process of targeted injection of self-expanding mixtures using the FEM is modeled by point displacements of the nodes of the computational domain and a change in the boundary conditions. The results obtained on the displacements of the day surface, depending on the local increase in volume in the soil stratum, allow us to judge about the adequate operation of the program and the possibilities of numerical modeling of the processes of work during compensatory injection.
Predicting the reduction of embankment pressure on the surface of the soft ground reinforced by sand drain with random forest regression
Authors: Duc Pham Tiep , Duc Bui Nang , Tien Nguyen Tuan , Chi Phan Hieu 
Published: July 2020

Abstract
The consolidation acceleration of embankment with sand drain has been studied in many researchs and standards. However, the pressure distribution on the surface of soft ground with the appearance of sand drain has not focused. Intuitively, because of the much higher stiffness of sand drain compared to this of soft soil, the stress concentration at the top of sand drain occurred along with the pressure decrease on the surface of soft ground. In this paper, the Finite Element Analysis (FEA) is implemented to obtain a labeled database with inputs are sand drain and soft soil moduluses, diameter of sand drains and distance between them. The predicted variable is the ratio of pressure on the surface of soft ground with and without sand drain (K) obtained based on simulation with Plaxis. Consequently, the developed database used as the input of a machine learning model, the Random Forest Regression (RFR). To the end, observations from FEA reinforced the initial intuition of this phenomenon and a predicting model for K also proposed with Random Forest Regression.
Increasing flow turbidity in pressure systems
Authors: Rakhimov Qudratjon , Allayorov Davronjon , Ibragimova Zaytuna 
Published: July 2020

Abstract
Clearing the water reservoirs from sediments is one of the most pressing problems. There are several ways to deal with this problem, and in most cases, they require enormous amounts of money and energy. Studying the motion of a muddy flow in pressure pipelines is one of the important works for solving this problem. Designed by the Department of Hydraulics and Hydroinformatics (TIIAME), the the inkjet apparatus is considered to be an energy-saving device and uses the potential of the flow itself to remove the muddy sediment from the water structures to the bottom. Typically, the flow carrying capacity depends on several hydraulic flow elements. The article discusses that fuzzy transporting ability depends on relative depth. Relative depth is the ratio of the suction height to the water head in front of the water outlet. The studies were conducted in laboratory conditions. Theoretical work is justified by the law of energy conservation. As a result, a new expression is obtained showing the relationship between the transporting ability of the flow and relative depth.
Calculating the maximum pressure on the diaphragm wall subjected to seismic loading accounting for geotechnical conditions of Vietnam
Authors: Nikiforova Nadezhda , Van-Hoa Nguyen 
Published: July 2020

Abstract
The Russian standards have not provided a method for calculating the pressure on the diaphragm wall under seismic impacts. Vietnamese geotechnical standards use the approach outlined in Eurocode-8. In this study, an empirical and analytical method for determining the maximum pressure on the diaphragm wall for typical types of engineering and geological conditions in Vietnam are proposed based on the pseudo-static method and numerical studies. The results are compared with the values obtained from PLAXIS-2D program, showing a good agreement.
Water jet cutting resistance
Authors: Volgina Ludmila , Sergeev Stanislav 
Published: July 2020

Abstract
The main purpose of the study was establishing the coefficient of hydraulic resistance of two-phase flow using in water jet cutting. In waterjet cutting (JWC) and in abrasive waterjet cutting (AJWC), a two-phase flow consist of water and abrasive solid particles, moves at a high mean velocity (more than 8.0 m/s). Such flows differ from natural and well-studied flows in hydraulic transport. The aim of this work is to investigate experimentally the additional pressure losses during transportation of the abrasive. For the experimental research were used. The supply of fire extinguishing agents is carried out along the sleeve lines, and, as is known, there are pressure losses. In this regard, the problem arises, at what maximum distance from the pumping unit is possible to supply fire extinguishing agents in the form of water and a mixture of water and abrasive particles, and how pressure losses occur in this case, because the flow rates and working pressure of fire extinguishing systems with waterjet cutting are high enough (the working pressure is 30 MPa). The loss of pressure during transportation depends on the flow rate, its viscosity, pipeline characteristics, etc. The results of field studies to determine the basic kinematic characteristics of the two-phase flow are presented. The combination of these parameters is largely characterized by the coefficient of hydraulic friction, which is insufficiently studied for the systems under consideration. As a result of the obtained experimental data, based on the Darcy-Weisbach equation, the coefficient of hydraulic friction was determined, the value of which was 0.019. The coefficient of local resistance was 0.45.
Interaction of a long barrette with three-layer base taking into account elastic and elastic- viscous properties of hereditary creep
Authors: Ter-Martirosyan Zaven , Huu Hung Dam 
Published: July 2020

Abstract
The formulation and solution for the problem of interaction of a single barrette with the surrounding inhomogeneous massif are considered, taking into account the elastic property and elastic-viscous hereditary creep of soils on the basis of mathematical functions and models of the soil environment. In this case, determining the stress-strain state (SSS) of a single barrette with surrounding and underlying soil is complexity. It is shown that when the elastic-viscous hereditary creep of soils is available, there is a redistribution of effort on the barrette between the side surface and the lower end of the barrette in time. Resulting solution can be used to predict the sediment of a single barrette, as well as to determine the limit of the long-term load capacity of a single barrette.
Modification of structural properties of filled soil by the “Geocomposite” method in the base of foundation slab
Authors: Znamensky Vladimir , Morozov Evgeniy , Chunyuk Dmitriy , Vlasov Alexandr 
Published: July 2020

Abstract
The article is devoted to one of the most effective and promising methods for improving the structural properties of soils - the method of “Geocomposite”. The method is based on the compaction and reinforcement of the soil through the injection of mortar under high pressure, as a result of which there is a fundamental change in the soil body and the formation of a rigid structure naturally inscribed in the soil layer. The method is widely used both to improve the mechanical properties of soils for new construction, and for raising and eliminating the tilt of the operated buildings (compensation injection). The article presents brief information about the technology of shoring soil using the “Geocomposite” method and the main differences in the formation of fixed volumes in cohesiveless and cohesive soils.
A resource-efficient development of VELOX-technologies during erection and reconstruction of prefabricated monolithic floor slabs
Authors: Akimov Seyran , Shalenny Vasiliy , Leonenko Kirill , Malahov Vladimir 
Published: July 2020

Abstract
A resource-efficient method of installation of prefabricated monolithic floor slabs by increasing the degree of their construction readiness is proposed in the article. This effect is achieved by the reducing of their own weight and the use of fixed formwork. The reduction in the dead weight of the precast-monolithic floor slab is ensured by the use of light three dimensional lined forms of trapezoidal or rectangular shape, preferably made of expanded polystyrene during the installation of the floor slab. The use of fixed timber formwork will obviate the need for the later implementation of labor-intensive finishing and insulation works. Thus, the installed floor slab will have an increased degree of building readiness immediately after its manufacture, and will also reduce the weight of the structure, which in turn will reduce the material consumption and accordingly the cost of the supporting structures of the building.
Composite Modelling in Port Engineering
Authors: Hadla Ghinwa , Anshakov Alexander , Kantarzhi Izmail 
Published: July 2020

Abstract
An introduction and review of the composite modelling, defined as the combining of physical and numerical models, are presented in this paper. Although the composite modelling is still in its infancy in the hydraulic community, in MSUCE it has been applied in many coastal projects, which will be described in this paper. The strengths and weaknesses of numerical and physical models for each case studies, are described. The optimal methodologies and guidelines on how to decide if the composite modelling is beneficial and how to set up a composite modelling experiment, are given. Finally, it was concluded that despite the challenges and difficulties, there is a growing trend toward applying the composite modelling as an effective tool in the field of coastal engineering.
To the problem of determining the deformation characteristics of jointed rock mass
Authors: Zertsalov Michail , Vlasov Daniil , Minin Kirill 
Published: July 2020

Abstracts
The article considers the results of the study of a fragment of rock mass weakened by a system of parallel joints. Using numerical modelling, its deformation characteristics at different ratios of the characteristic size of the fragment to the characteristic size of its structural element (layer) are studying. The conditions for the representativeness of a fragment are discussed. The results of numerical calculations are compared with the results of the previously proposed analytical calculation method and the conditions for their convergence are discussed.
Transient processes and optimization of HPP hydraulic structures
Authors: Berlin V V , Fink A K , Golubev A V , Muraviov O A 
Published: July 2020

Abstract
In the scope of Hoabinh HPP extension an additional powerhouse is being designed on the common reservoir with two units 240 MW each and two pressure tunnels 765-785 m long. Due to unfavorable geological conditions the design organization made the decision to abandon the construction of the compensating reservoirs on the tunnels. To reduce the hydraulic hammer the current speed in tunnels was decreased to 3 m/s which is half as much of the speeds normally accepted in energy conduits. The article presents a set of calculations of transient processes required for feasibility study of decreasing the internal diameter of the head conduit in abandonment of the construction of the compensating reservoir. The calculations were performed using the specialized program of calculations of the transient processes of HPP. There were considered the processes of load rejection, frequency regulation in allocation to the isolated energy district and power regulation at constant frequency in the power grid. There is presented the system of limitations of the parameters of transient processes which permitted to justify the decrease in the internal diameter of the conduit from 11.5 to 10.5 m. It is shown that with decrease of the pressure tunnel diameter there are fulfilled the given guarantees of regulation in pressure and in rotation frequency, the conditions of fluctuation stability in frequency regulation, specific speed of power regulation.
Ejecting ability of circulating flows of liquid and gas
Authors: Orekhov Genrikh 
Published: July 2020

Abstract
The process of aeration of liquid plays an important role in many structures and devices. In water-works and hydropower construction during operation of the spillway systems, aeration allows for hydrodynamic and cavitation effects on the elements of the structures to be monitored. Aeration is also used to saturate water with oxygen depending on the purpose of the chemical or biochemical processes in various industries, for example, in fisheries and hydro ecology. Of all known methods the most widespread is the gas-liquid aeration. It allows not only to generate air bubbles, but also to control technological parameters. Various types of circulating flows of liquid and gas, which are swirling flows in circular cylindrical channels, are widely used in various fields of engineering. One of the effects of such flows is the emergence of recirculation areas with pressure in the near-axial zone of the flow below atmospheric one, which makes it possible to eject air into water masses. This feature allows the use of efficient aeration devices based on circulation flows. The report presents the results of physical studies of a complicated flow formed by interacting, oppositely rotating, coaxially located liquid layers. The description of the experimental stand for model studies of such flows is given. Analytical dependences of pressure distribution and specific energy in circulation flow of the viscous liquid are presented. The results of physical modeling to determine the ejection ability of circulating flows, the experimental dependences of the ejection coefficient for different methods of swirling the flow are presented.