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Prepoznavanje lastnosti in trajnostno upravljanje s sedimenti iz vodnih okolij : doktorska disertacija
Smolar, Jasna (Author), Petkovšek, Ana (Mentor) More about this mentor... This link opens in a new window, Mikoš, Matjaž (Thesis defence commission member), Logar, Janko (Thesis defence commission member), Žagar, Dušan (Thesis defence commission member), Mladenovič, Ana (Thesis defence commission member)

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Abstract
V vodnih plovnih poteh in umetnih akumulacijah na kopnem se kopičijo sedimenti, ki izvirajo iz naravnega geološkega zaledja in so po mineralni in zrnavostni sestavi podobni zemljinam. Nakopičeni sedimenti zmanjšujejo obratovalno in funkcionalno varnost teh objektov, zato jih je potrebno redno odstranjevati in odlagati na drugem mestu. Odlaganje se lahko izvaja s premeščanjem znotraj vodnega telesa ali s skladiščenjem na kopnem. V umetnih akumulacijah na kopnem so uskladiščeni tudi industrijski mulji. Zaradi visoke vlage in rahle strukture je trdnost muljev praviloma nižja od trdnosti zemljin pri vlagi na meji židkosti, številni mulji imajo tiksotropen značaj. V disertaciji smo raziskovali ali so terenske in laboratorijske raziskave ter materialni modeli, uveljavljeni za zemljine, primerni tudi za identifikacijo lastnosti in napoved obnašanja muljev. Preiskovali smo reful iz Luke Koper in mulj kemične sadre, ki nastaja pri proizvodnji titanovega dioksida v Celju. Oba mulja sta skladiščena na kopnem v umetnih akumulacijah, ki predstavljajo omejitve pri načrtovanju razvoja infrastrukture in proizvodnje. Akumulacije refula so zgrajene za nizkimi obodnimi nasipi, akumulaciji mulja sadre pa za visokima nasutima pregradama Za Travnikom in Bukovžlak, ki sta objekta visokega tveganja. Lastnosti muljev smo identificirali s terenskimi in laboratorijskimi preiskavami. Rezultate smo izvrednotili v luči klasične geomehanike, upoštevaje posebnosti, ki izvirajo iz okolja nastanka in novega sedimentacijskega okolja. Raziskali smo vpliv soli na indeksne lastnosti refula, preverili omejitve terenske opreme in veljavnost semiempiričnih zvez, razvitih za zemljine, za vrednotenje terenskih raziskav mulja sadre. Z reološkimi raziskavami smo pokazali široko uporabnost ConTec Viscometra 5, razvitega za malte in betone, tudi na področju sedimentov. Ovrednotili smo občutljivost muljev in njihovo tiksotropno obnašanje. Raziskali smo možnost izboljšanja refula z anorganskimi vezivi. Iz rezultatov laboratorijskih preiskav in iz parametrov poskusnih tlačnih filtracij suspenzij muljev smo določili parametre za modelne izračune konsolidacijskega lezenja, sušenja v akumulacijah in tlačne filtracije. Ugotovili smo, da lahko konsolidacijsko lezenje v edometru dobro opišemo s Soft soil creep modelom v Plaxisu, da z 1D modelom, razvitim za sušenje plazine iz plazu Slano Blato, ne moremo ustrezno ovrednotiti sušenja muljev v akumulacijah in da lahko tudi s preiskavo stisljivosti v edometru zadovoljivo opišemo tlačno filtracijo.

Language:Slovenian
Keywords:grajeno okolje, gradbeništvo, disertacije, mulj, identifikacijske lastnosti, reologija, izboljšanje z vezivi, lezenje, modelni opis
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2016
Publisher:[J. Smolar]
Number of pages:XXXVIII, 240 str.
UDC:624.131.4/54: 532.13:(043)
COBISS.SI-ID:7853409 This link opens in a new window
Views:2436
Downloads:759
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Secondary language

Language:English
Title:Recognition of properties and sustainable management of sediments from water environments : doctoral thesis
Abstract:
Sediments from natural geological hinterland accumulate inside waterways and man made accumulations on land. Their grain size distribution and mineral composition are comparable with soils. Accumulated mud reduces safe operation and functionality of these facilities. Thus, it should be permanently removed and disposed of inside the water body or on land. Industrial muds are also stored in man made accumulations on land. Due to high water content, strength of muds is usually lower than strength of soils with water content at liquid limit. Some muds exhibit thixotropic behaviours. In this thesis, the validity of in situ and laboratory test methods and material models, developed for soils, for the identification of mud properties and for the prediction of their behaviour, were investigated. Two muds were examined: dredged marine sediment – reful from the Port of Koper and red gypsum mud, which is by-product in the production of titanium dioxide in Celje. Both are deposited on land, in accumulations which present limitations in the planning of the infrastructure and production. Reful is deposited in shallow lagoons, while red gypsum mud is stored behind two large embankments Za Travnikom and Bukovžlak, which represents high risk facilities. Properties of muds were identified with in situ and laboratory investigations. Results were interpreted in the light of classical soil mechanics, taking into account the specificities which emanate from the mud origin and from new sedimentation environment. The influence of salty pore water on the index properties of reful was determined. The limitations of in situ measuring sensors for the investigation of muds were checked. The validity of semi empirical relationships, developed for evaluation of in situ tests in soils, for the description of red gypsum mud properties were analysed. ConTec Viscometer 5, designed for mortars and concrete, was recognized as suitable also for rheological investigations of muds. The sensitivity and thixotropic behaviours of muds were evaluated. The improvement of reful was investigated by mixing it with inorganic binders. From the results of laboratory tests and from trial pressure filtration tests, technological and material parameters for model description of consolidation creep, drying and pressure filtration, were estimated. Results show that Soft soil creep model is suitable for the description of consolidation creep, while basic 1D model, developed for the computation of the Slano Blato landslide drying, is not completely appropriate for the description of drying of mud in the accumulation and oedometer test is suitable also for the prediction of the pressure filtration parameters.

Keywords:building environment, civil engineering, thesis, mud, index properties, rheology, improvement with additives, creep, modeling

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