Slovak Journal of Civil Engineering最新文献_第8页

The Reinforcement of Sand by Fibres with a Non-Uniform Shape 非均匀形状纤维对砂土的加固

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0013

Pavel Koudela, J. Chalmovský, L. Míča

引用次数: 0

Effect of Modifying Aggregates by Rap and the Simultaneous use of Adhesives for the Stabilization of a Sandy Pavement Subgrade 振捣改性集料和同时使用胶粘剂对砂质路面路基稳定的影响

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0008

M. Khabiri, Bahareh Ebrahimialavijeh

{"title":"Effect of Modifying Aggregates by Rap and the Simultaneous use of Adhesives for the Stabilization of a Sandy Pavement Subgrade","authors":"M. Khabiri, Bahareh Ebrahimialavijeh","doi":"10.2478/sjce-2021-0008","DOIUrl":"https://doi.org/10.2478/sjce-2021-0008","url":null,"abstract":"Abstract The improvement, reconstruction and repair of roads in recent years have increased the content of recycled asphalt in pavements. Using these materials in road construction projects because they reduce the costs, will also be of great help in improving environmental issues. In the present study, dune sand, which can be found in most desert area soil but does not have proper strength and loading capacity for a subgrade, was used. In order to increase the strength parameters of dune sand, various contents of cement and recycled asphalt were examined in California Bearing Ratio (CBR) and compressive strength tests. The results showed that the addition of cement and recycled asphalt can increase compressive strength and bearing capacity and reduce rupture deformations. In a stabilized sample with 27.5% recycled asphalt, increasing the cement from 7.5 to 12.5% increased the compressive strength by 1.045 times, which is the highest amount of change in the samples studied. The maximum CBR and minimum rupture deformations are related to 35% of the recycled asphalt and 12.5% of the cement. The predicted functions of the compressive strength, deformation and CBR depend on two variables of the cement content; the recycled asphalt was then calculated using the response surface method","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":" ","pages":"1 - 8"},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49086989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

The Domaša Reservoir in the Spectrum of Climate Change 气候变化光谱中的多马沙水库

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0009

J. Skvarka, E. Bednárová, Marián Miščík, Ľubomír Uhorščák

{"title":"The Domaša Reservoir in the Spectrum of Climate Change","authors":"J. Skvarka, E. Bednárová, Marián Miščík, Ľubomír Uhorščák","doi":"10.2478/sjce-2021-0009","DOIUrl":"https://doi.org/10.2478/sjce-2021-0009","url":null,"abstract":"Abstract The importance of water reservoirs in the uneven distribution of discharges over time and space does not need to be explicitly justified. There is a more than 6,000-year history of convincing evidence. In Slovakia, the construction of reservoirs can be dated to two periods. The first period was the 18th century, when the construction of water reservoirs was stimulated by the need for water for the mining industry in the vicinity of the town of Bánska Štiavnica. The second period falls into the second half of the 20th century. The construction of reservoirs was initiated by the post-war period, including the need to increase society’s standard of living, the electrification of the region, the development of industry and agriculture, flood protection, etc. Reservoirs with multi-annual regulations have an essential position in the types of water reservoirs. While small water reservoirs and annual or seasonal regulation can regulate flows in a short period, reservoirs with multi-annual regulation can regulate flows over several years. This benefit is evident, especially during periods of extreme hydrological phenomena and short-term aquatic and long-term dry, so-called low water periods. We have illustrated our knowledge of and experience gained from their impact on the flows downstream of the Veľká Domaša dam. We analyzed two time periods, i.e., before and after the year 2000. The influence of extreme hydrological phenomena on the runoff conditions downstream of the dam is presented by statistical processing of the available flow series","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"29 1","pages":"9 - 15"},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45392628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Aerodynamic Study of the Wind Flow in the Area of the R2 Expressway in Slovakia 斯洛伐克R2高速公路区域气流的空气动力学研究

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0014

O. Hubová, M. Macák, Alžbeta Grmanová

引用次数: 0

Determination of Subgrade Reaction Coefficients and Spring Stiffnesses for a Combined Pile Raft Foundation (CPRF) by Means of a Cluster Analysis 基于聚类分析的组合桩筏基础地基反力系数和弹簧刚度的确定

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0010

Szilárd Kanizsár

{"title":"Determination of Subgrade Reaction Coefficients and Spring Stiffnesses for a Combined Pile Raft Foundation (CPRF) by Means of a Cluster Analysis","authors":"Szilárd Kanizsár","doi":"10.2478/sjce-2021-0010","DOIUrl":"https://doi.org/10.2478/sjce-2021-0010","url":null,"abstract":"Abstract An analysis of combined piled raft foundations could be performed by means of a special geotechnical finite element software that utilizes 3D modeling and advanced constitutive models for the soil. However, a foundation is generally included in the structural models in a structural design program. The least advanced part of finite element software that has been developed for structural FEM modeling are the tools used for modeling behaviour. A method is required with which the input parameters of the structural design software that are used for modeling the soil structure interaction as well could be determined so that the results calculated by means of a geo-technical software that approximates realistic soil behaviour the best can be reproduced by structural design software as well. The procedure outlined in this paper by means of a cluster analysis provides a tool for a substantial and innovative improvement in subsoil modeling, to which not enough attention is generally paid in the structural FEM software, thereby resulting in a reduced amount of work associated with the task of inputting data.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"29 1","pages":"16 - 29"},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42346821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-Hydrostatic Transitional Open-Channel Flows from a Supercritical to a Subcritical State 从超临界状态到亚临界状态的非静水过渡明渠流

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Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI: 10.2478/sjce-2021-0012

Y. Zerihun

{"title":"Non-Hydrostatic Transitional Open-Channel Flows from a Supercritical to a Subcritical State","authors":"Y. Zerihun","doi":"10.2478/sjce-2021-0012","DOIUrl":"https://doi.org/10.2478/sjce-2021-0012","url":null,"abstract":"Abstract In this study, a depth-averaged numerical model was employed to investigate the two-dimensional flow features of transitional open-channel flows from a supercritical to a subcritical state. Compared to a shallow-water model, the proposed model incorporates supplementary terms to account for the effects of non-uniform velocity and non-hydrostatic pressure distributions. The model equation was solved numerically by means of the Adams–Bashforth–Moulton scheme. A wide variety of transitional open-channel flow problems such as hydraulic jumps was considered for assessing the suitability of the numerical model. The results of the model for the free-surface profile, pressure distribution, and characteristics of the first wave of an undular jump were compared with the experimental data, and the agreement was found to be satisfactory. Despite the effects of the three-dimensional characteristics of the flow and the bulking of the flow caused by air entrainment, the model performed reasonably well with respect to the simulations of the mean flow characteristics of the curvilinear turbulent flow problems. Furthermore, the results of this investigation confirmed that the model is more suitable for analyzing near-critical turbulent flow problems without cross-channel shock waves.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"29 1","pages":"39 - 48"},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45486484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermaly Active Interior Panels with an Integrated Active Area 具有集成活动区域的热活动内部面板

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Slovak Journal of Civil Engineering Pub Date : 2021-03-01 DOI: 10.2478/sjce-2021-0007

D. Kalús, Mária Kurčová, Z. Straková, Matej Kubica

引用次数: 0

Evaluation of the Cohesive Properties of SBS-Modified Binders at Low Temperatures sbs改性粘结剂的低温粘结性能评价

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Slovak Journal of Civil Engineering Pub Date : 2021-03-01 DOI: 10.2478/sjce-2021-0005

B. Kök, Yunus Erkuş, M. Yılmaz

引用次数: 2

Simulation Modelling of Aerial Works and Its Role in the Preparation of Construction 航空工程仿真建模及其在施工准备中的作用

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Slovak Journal of Civil Engineering Pub Date : 2021-03-01 DOI: 10.2478/sjce-2021-0004

A. Bisták, Z. Hulínová, Michal Neštiak

{"title":"Simulation Modelling of Aerial Works and Its Role in the Preparation of Construction","authors":"A. Bisták, Z. Hulínová, Michal Neštiak","doi":"10.2478/sjce-2021-0004","DOIUrl":"https://doi.org/10.2478/sjce-2021-0004","url":null,"abstract":"Abstract The construction process is characterized by a diverse technological composition and the use of a wide range of construction machinery and mechanization. The amount of machinery increases with the complexity of the construction, which increases the demands concerning the preparation and overall organisation of the construction. The preparation of construction processes carried out by helicopters (aerial work) must respect the effect of randomly changing construction conditions as well as the specific working conditions of helicopters. The complexity of such a system can be modelled using simulation models. In the work presented, we designed and practically tested a simulation model of aerial work in the MATLAB software environment. An essential part of the simulation model is an algorithm designed on the basis of commercial numerical weather prediction models. We consider the outputs of the simulation to be reliable, because they are very close to the actual results achieved in the case of the implementation of construction of this type. The concept of the simulation model enables its wider use not only in the construction sector, but also in other branches of industry.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"29 1","pages":"20 - 26"},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43128371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Sound Absorption Properties of Materials Based on Recycled Plastic Granule Mixtures 基于再生塑料颗粒混合物的材料吸声性能研究

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Slovak Journal of Civil Engineering Pub Date : 2021-03-01 DOI: 10.2478/sjce-2021-0003

Andrea Biskupičová, M. Ledererová, S. Unčík, C. Glorieux, M. Rychtáriková

引用次数: 5