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Title:UPORABA OGLJIKOVIH VLAKEN ZA OJAČITVE TEMELJNIH TAL
Authors:ID Žibert, Aleš (Author)
ID Škrabl, Stanislav (Mentor) More about this mentor... New window
ID Ivanič, Andrej (Comentor)
Files:.pdf MAG_Zibert_Ales_2015.pdf (6,23 MB)
MD5: 91A2847A0296F35D4FA278BD65FFD71B
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:Vsebina dela obravnava možnosti in učinkovitost uporabe ogljikovih vlaken v geotehniki. Za določitev vpliva armiranja peščenih tal z ogljikovimi vlakni na povečanje mejne nosilnosti in zmanjšanje posedkov togega temelja, obremenjenega z vertikalno obtežbo je bil izdelan modelni preizkus. Rezultati preizkusa kažejo, da je le z enostavnim armiranjem tal z armaturo iz ogljikovih vlaken, pod temelji mogoče doseči do 60% večje mejne nosilnosti in zmanjšanje posedkov pod temelji v primerjavi z nearmiranimi zemljinami. Modelni preizkus je bil obravnavan tudi z elasto-plastičnim modelom peščenih tal ter elastičnimi armaturnimi ogljikovimi palicami v pogojih prostorskih napetostnih in deformacijskih stanj (3D model), katerega rezultati numeričnih analiz okvirno potrjujejo rezultate modelnega preizkusa. Z numeričnimi analizami je dokazan vpliv armiranja na povečanje nosilnosti tal za 26%, ki jo prevzemajo tla pod temeljem ter vgrajena armatura. Rezultati opravljenega modelnega preizkusa in numeričnih analiz potrjujejo tezo dela, da je armiranje tal z ogljikovo armaturo (kompozitom ogljikovih vlaken in epoksidne smole) lahko uspešno, vendar zaradi izvedenega preizkusa le na enem tipu modela še ni mogoče podati dovolj zanesljivih končnih navodil in zaključkov ter predloga za uspešno uporabo obravnavane tehnologije izboljšanja nosilnosti tal v geotehnični praksi. Prav tako ocenjujemo, da ima armiranje nasipov in drugih geotehničnih objektov z ogljikovimi armaturnimi mrežami zaradi velike osne togosti nekatere pomembne prednosti v primerjavi z drugimi materiali v geotehnični praksi. Z numeričnimi analizami smo preverili tri primere uporabe ogljikove geomembrane z upoštevanjem teorije velikih deformacij. Rezultati potrjujejo učinkovitost uporabe ogljikove geomembrane v slabo nosilnih temeljnih tleh. Dokazali smo, da je uporaba teorije velikih deformacij potrebna, vendar je pri tem potrebna velika previdnost, da ne pride do napačne interpretacije rezultatov. Nadalje ugotavljamo, da so možnosti uporabe ogljikovih armaturnih mrež tudi v kombinaciji z bentonitnimi zapornimi membranami, ki jih množično uporabljamo za površinske tesnitve akumulacijskih in visokovodnih nasipov ter drugih hidrotehničnih objektov. Praktično neprepustne bentonitne membrane imajo zelo omejeno mehansko odpornost, ki bi jo lahko občutno izboljšali z ojačitvijo z ogljikovo armaturno mrežo.
Keywords:armirana zemljina, mehanika tal, nosilnost temeljnih tal, ogljikova geomembrana, Plaxis 3D Tunnel, posedki temeljev, teorija velikih deformacij, tkanina iz ogljikovih vlaken
Place of publishing:Maribor
Publisher:[A. Žibert]
Year of publishing:2015
PID:20.500.12556/DKUM-47211 New window
UDC:624.131.078.8(043.2)
COBISS.SI-ID:18711830 New window
NUK URN:URN:SI:UM:DK:DBRH8CZH
Publication date in DKUM:26.01.2015
Views:2666
Downloads:526
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FG
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Secondary language

Language:English
Title:THE REINFORCEMENT OF FOUNDATION SOIL WITH USES OF CARBON FIBRE
Abstract:The thesis deals with the possibilities and effectiveness of the use of carbon fiber in geotechnical engineering. Model testing was employed to determine the influence that reinforcement of sandy soil with carbon fiber has in increasing the ultimate bearing capacity and reducing the deflection of rigid foundation loaded with a vertical load. Testing results indicate that just a simple reinforcement of soil with carbon fiber reinforcement under the foundation can result in up to 60% higher maximum load capacity and reduction of deflections under the foundation compared with unreinforced soil. Model testing was also employed in dealing with the elastic-plastic model of sandy soil and elastic reinforcing carbon rods in conditions of spatial stress and deformation states (3D model); the results of its numerical analyses roughly confirm the results of the model testing. The numerical analyses have proven the effect of increasing the soil load capacity. The results of the model testing and numerical analyses confirm the thesis of this paper; namely that soil reinforcement with carbon reinforcement (composite of carbon fiber and epoxy resin) can be successful, but because the test was carried out on only one type of the model, it is not yet possible to give a sufficiently reliable final directions, conclusions or proposals for a successful application of the techniques for improving the soil’s load capacity in geotechnical practice. Moreover, we estimate that reinforcing embankments and other geotechnical structures with carbon reinforcement nets due to high axial stiffness has some important advantages compared to other materials in geotechnical practice. We analyzed three examples of applications of carbon geomembrane with numerical analysis and with respect to the theory of large deformations. The results confirm the effectiveness of the use of carbon geomembrane in poor load-bearing foundation soil. We proved that is the use of the theory of large deformation necessary, but it is of great caution that there is no misinterpretation of the results. Further, we note that the possibility of using carbon reinforcement nets are presented for using carbon reinforcement nets in combination with bentonite seal membranes, which are widely used for surface sealing of reservoir and high-water embankments and other hydro technical structures. Virtually impervious bentonite membranes have very limited mechanical resistance, which could be significantly improved by reinforcement with carbon reinforcement net.
Keywords:bearing capacity of soil, carbon fibre fabrics, carbon geomembrane, Plaxis 3D Tunnel, reinforced soil, settlements under the foundation, theory of large deformations


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