Studia Geotechnica et Mechanica最新文献_第10页

Laboratory tests and analysis of CIPP epoxy resin internal liners used in pipelines – part II: comparative analysis with the use of the FEM and engineering algorithms 管道用CIPP环氧树脂内衬的实验室试验和分析——第二部分：有限元法和工程算法的比较分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-05-11 DOI: 10.2478/sgem-2021-0007

T. Abel

{"title":"Laboratory tests and analysis of CIPP epoxy resin internal liners used in pipelines – part II: comparative analysis with the use of the FEM and engineering algorithms","authors":"T. Abel","doi":"10.2478/sgem-2021-0007","DOIUrl":"https://doi.org/10.2478/sgem-2021-0007","url":null,"abstract":"Abstract In the case of underground network infrastructure it can be seen that objects functioning in the second technical condition, according to DWA-ATV 143-2, and subjected to rehabilitation with the use of close-fit trenchless technologies are capable of withstanding external loads. The main external load that is taken into account in engineering calculations in the case of conduits in the second technical condition is external groundwater pressure. In order to compare design parameters obtained with the use of various calculation methods, a comparative analysis was conducted in order to determine the values of critical pressure. The calculations were carried out using popular engineering algorithms. In addition, analyses using the Finite Element Method and Abaqus software as a computational tool were carried out for the purpose of verifying laboratory tests. This paper aims to broaden knowledge concerning the possibility of performing control numerical analyses for close-fit liners installed in pipelines that are in the second technical condition according to DWA-ATV 143-2. The analyses were carried out on ten 3D models. The models were parameterized in order to reflect the CIPP samples in the most accurate way. The computational models were built based on assumptions, which are commonly used in this type of scientific analysis, regarding material parameters and their interactions. The direct value of the performed engineering calculations and numerical analyses is the extension of knowledge in the field of strength parameters that are obtained by various material groups of close-fit liners. Comparative analysis of the results of laboratory tests and numerical analyses, and the conclusions that result from them, constitute the basis for the optimization of the design process and the individual approach to issues related to the use of liners that strengthen underground pipelines.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"307 - 322"},"PeriodicalIF":0.6,"publicationDate":"2021-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44668350","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 effect of the pre-wetting of expanded clay aggregate on the freeze-thaw resistance of the expanded clay aggregate concrete 膨胀粘土骨料预润湿对膨胀粘土骨料混凝土抗冻融性能的影响

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-01-20 DOI: 10.2478/sgem-2020-0011

M. Musiał, F. Grzymski, T. Trapko

{"title":"The effect of the pre-wetting of expanded clay aggregate on the freeze-thaw resistance of the expanded clay aggregate concrete","authors":"M. Musiał, F. Grzymski, T. Trapko","doi":"10.2478/sgem-2020-0011","DOIUrl":"https://doi.org/10.2478/sgem-2020-0011","url":null,"abstract":"Abstract This paper presents experimental research on expanded clay aggregate concrete. The aim of the investigations was to determine if the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. Five concrete series based on the same concrete mix design were made and tested. The degree of pre-wetting of the aggregate was varied: dry aggregate was used in the first series, aggregate with a moisture content of 10% was used in series IA and IB and aggregate with a moisture content of 25% was used in series IIA and IIB. Also the approach to the production process was varied: in series A the water contained in the aggregate was taken into account in the global water-cement ratio (consequently a reduced amount of water was added to the mix), whereas in series B the nominal amount of water was added to the mix (as in the case of dry aggregate). The freeze-thaw resistance criterion was based on the assessment of the decrease of compressive strength and increase in weight loss after exposure to freeze-thaw cycles. The expanded clay aggregate concrete's strength and mass decrements caused by freeze-thaw cycling were used as the measure of its freeze-thaw resistance. The investigations have shown that the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. The differences of concrete compressive strength decrease related to freeze-thaw durability may be 2 to 5 times greater when inadequate method of calculating mixing water for concrete is used.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"65 - 73"},"PeriodicalIF":0.6,"publicationDate":"2021-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49384663","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

3D DEM simulations of basic geotechnical tests with early detection of shear localization 具有剪切定位早期检测的基础岩土工程试验的三维DEM模拟

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-12-01 DOI: 10.2478/sgem-2020-0010

A. Grabowski, M. Nitka

引用次数: 4

Numerical analysis of tailing dam with calibration based on genetic algorithm and geotechnical monitoring data 基于遗传算法和岩土监测数据的尾矿坝标定数值分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-11-24 DOI: 10.2478/sgem-2020-0008

Szczepan Grosel

引用次数: 1

Numerical Modeling of Wall Pressure in Silo with and Without Insert 有镶块和无镶块筒仓壁压的数值模拟

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-10-28 DOI: 10.2478/sgem-2020-0009

Frzat Askif, Hala Hammadeh, A. Ubysz, M. Maj

引用次数: 1

Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis 基于等效非线性随机土结构相互作用分析的地震规范

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-10-23 DOI: 10.2478/sgem-2020-0007

M. Guellil, Z. Harichane, E. Çelebi

{"title":"Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis","authors":"M. Guellil, Z. Harichane, E. Çelebi","doi":"10.2478/sgem-2020-0007","DOIUrl":"https://doi.org/10.2478/sgem-2020-0007","url":null,"abstract":"Abstract The aim of this study is to consider the effects of the variation of shear modulus ratio (G/G0) and damping ratio (ξ) of soil, obtained by a linear iterative method based on the design spectra of seismic codes, the soil environment in terms of uncertainties in shear modulus using Monte Carlo simulations and the foundation damping (ξf) of flexible base for analyses of the Soil-Structure Interaction (SSI) problems. A squat structure with circular shallow foundation resting on a soil layer over a homogeneous half-space is studied by using cone model and considering seismic zone effect on structural response. Firstly, after showing the effects of the correction of G and ξ on impedance functions and the responses of soil-foundation-structure system, a study is carried out to compare these effects to those of the modelling of uncertainties in shear modulus as random variations. Secondly, a comparative analysis on design response spectra and base shear forces was carried out for four seismic codes (Algerian Seismic Rules RPA99-2003, Eurocode 8–2004, International Building Code IBC-2015 and Indian Code IS-1893-2002) considering the three cases of SSI: SSI effects (initial G and ξ), nonlinear SSI (corrected G and ξ) and stochastic SSI (random G with COV = 20%) compared to the fixed base case. Results show that the correction of G and ξ, according to the equivalent nonlinear method in all the cases, leads to a remarkable decrease in peak responses but show a huge amount of reduction in the second study for IBC-2015 and IS-1893-2002 codes compared to the other codes.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"1 - 14"},"PeriodicalIF":0.6,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45726542","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: 3

Influence of Waste Toothbrush Fiber on Strength and Freezing–Thawing Behavior in High Plasticity Clay 废牙刷纤维对高塑性粘土强度及冻融性能的影响

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-10-23 DOI: 10.2478/sgem-2020-0006

Fatih Isik, R. K. Akbulut, A. S. Zaimoglu

引用次数: 1

Risk Reduction of a Terrorist Attack on a Critical Infrastructure Facility of LGOM Based on the Example of the Żelazny Most Tailings Storage Facility (OUOW Żelazny Most) LGOM关键基础设施遭受恐怖袭击的风险降低——以Żelazny Most尾矿库(OUOW Żelazny Most)为例

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-09-25 DOI: 10.2478/sgem-2020-0004

J. Bac-Bronowicz, Piotr Kowalczyk, M. Bartlewska-Urban

{"title":"Risk Reduction of a Terrorist Attack on a Critical Infrastructure Facility of LGOM Based on the Example of the Żelazny Most Tailings Storage Facility (OUOW Żelazny Most)","authors":"J. Bac-Bronowicz, Piotr Kowalczyk, M. Bartlewska-Urban","doi":"10.2478/sgem-2020-0004","DOIUrl":"https://doi.org/10.2478/sgem-2020-0004","url":null,"abstract":"Abstract This paper identifies the threats and risks of a terrorist attack on a critical infrastructure facility based on the example of Żelazny Most Tailings Storage Facility (OUOW). The threat analysis primarily took into account the threats of deliberate human actions. Identification of potential threats concerning the infrastructure surrounding the facility was conducted based on information that is readily available on the Internet. The reasons why it may be a potential target were also justified. Numerical calculations of the stress–deformation scale of the initial state of the reservoir, based on the Biot model with the Kelvin–Voight rheological skeleton, were presented as a starting point for in-depth research on the scale of threats and risks to the reservoir. The presented numerical model can be a starting point for calculating the stability of a reservoir subjected to explosives. The facility constitutes a major element of Lubińsko-Głogowski Okręg Miedziowy (Lubin-Głogów Copper District). OUOW Żelazny Most is the biggest such facility in Europe and is utilized to collect tailing waist. When expanded in its southern quarter, the facility will be the biggest in the world.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"42 1","pages":"376 - 387"},"PeriodicalIF":0.6,"publicationDate":"2020-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45297692","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: 5

Using Triaxial Tests to Determine the Shearing Strength of Geogrid-Reinforced Sand 用三轴试验确定土工格栅加筋砂抗剪强度

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-09-25 DOI: 10.2478/sgem-2020-0005

Š. Skuodis, N. Dirgėlienė, Jurgis Medzvieckas

引用次数: 5

Statistical analysis of mechanical properties on the example of aggregates of Carpathian sandstones 喀尔巴阡山砂岩集料力学性能的统计分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2020-09-24 DOI: 10.2478/sgem-2020-0003

J. Hydzik-Wiśniewska, Łukasz Bednarek

{"title":"Statistical analysis of mechanical properties on the example of aggregates of Carpathian sandstones","authors":"J. Hydzik-Wiśniewska, Łukasz Bednarek","doi":"10.2478/sgem-2020-0003","DOIUrl":"https://doi.org/10.2478/sgem-2020-0003","url":null,"abstract":"Abstract The constantly growing, broadly understood, construction industry requires the use of a large amount of aggregates. The construction of roads, motorways, railway lines and hydrotechnical structures requires the use of aggregates of high quality, which is primarily determined by mechanical properties. The basic parameters describing mechanical properties of aggregates are the Los Angeles (LA) fragmentation resistance coefficient and the Micro-Deval (MDE) abrasion resistance coefficient. The LA and MDE coefficients depend mainly on the type of rock and its physical and mechanical properties. This has been thoroughly researched and documented as evidenced by the abundant literature in the field. However, the correlation between LA and MDE coefficients still gives rise to extensive discussions and some concerns. A number of publications demonstrate dependencies for various types of aggregates. Therefore, research was undertaken to present statistical analysis for one type of aggregate and one geological area. This article presents the results of the fragmentation resistance test in the Los Angeles drum and the abrasion resistance test in the Micro-Deval drum of aggregates from Carpathian sandstone deposits. Aggregate samples were divided into three groups according to the location of the deposits and the tectonic unit from which they originated. The obtained results were subjected to static analysis to fit the best mathematical function describing the relationship between the two parameters.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"42 1","pages":"366 - 375"},"PeriodicalIF":0.6,"publicationDate":"2020-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41674594","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: 3