20.500.12556/DKUM-47211 UPORABA OGLJIKOVIH VLAKEN ZA OJAČITVE TEMELJNIH TAL THE REINFORCEMENT OF FOUNDATION SOIL WITH USES OF CARBON FIBRE 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. 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. armirana zemljina mehanika tal nosilnost temeljnih tal ogljikova geomembrana Plaxis 3D Tunnel posedki temeljev teorija velikih deformacij tkanina iz ogljikovih vlaken bearing capacity of soil carbon fibre fabrics carbon geomembrane Plaxis 3D Tunnel reinforced soil settlements under the foundation theory of large deformations true true false [A. Žibert] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2015-01-15 11:46:07 2015-01-26 13:41:34 2022-05-20 03:07:07 2021-05-06 03:17:07 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 624.131.078.8(043.2) 18711830 URN:SI:UM:DK:DBRH8CZH MAG_Zibert_Ales_2015.pdf MAG_Zibert_Ales_2015.pdf 1 91A2847A0296F35D4FA278BD65FFD71B cc5101fb4c66fe798d1e9ebad47dcee28317e50ea3be2540b192598e09add034 8620782a-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=69833 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo 0 0 0