Raziskave likvifakcije peskov z lokacije HE Brežice

diplomska naloga

Jasna Smolar (Author), Bojan Majes (Mentor), Janko Logar (Thesis defence commission member), Ana Petkovšek (Co-mentor)

Abstract

Keywords

gradbeništvo;diplomska dela;UNI;likvifakcija;potres;zemljine;dinamična obremenitev;laboratorijske preiskave;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[J. Smolar]
UDC:	550.34:624.15:627.8(043.2)
COBISS:	5163617
Views:	1896
Downloads:	471
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Investigation of liquefaction potential of sands from the subsoil at the HPP Brežice
Secondary abstract:	Phenomenon of liquefaction is characteristic for loose, saturated, fine-grained cohesionless soils. These soils tend to compact under monotonic, impulsive or repeating load (e.g. earthquake) which leads to the increase of pore water pressures and consequently to the loss of shear strength. Using “in situ” and laboratory tests the susceptibility of liquefaction of fine-grained sands under the flood embankments of the hydropower plant Brežice is investigated in the presented thesis. Suitability of this local soil for the construction of these embankments is also checked. With regard to index values representative material for investigation of dynamic properties of the soil was selected. Effect of different parameters like void ratio, water content and cyclic stress ratio on the liquefaction of the abovementioned soil was checked in controlled conditions in the laboratory. Obtained results from the samples prepared in the laboratory were then compared to the results on intact samples taken from different layers of the full scale test embankment. Results of laboratory tests were used for the evaluation of the results of in-situ investigations. Characteristics of the fine-grained sand from the hydropower plant Brežice were finally compared to Toyoura sand as a reference material.
Secondary keywords:	civil engineering;graduation thesis;liquefaction;earthquake;soil;dynamic load;laboratory testing;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XI, 54 str., pril.
Type (ePrints):	thesis
Title (ePrints):	Investigation of liquefaction potential of sands from the subsoil at the HPP Brežice
Keywords (ePrints):	likvifakcija;potres;zemljine;dinamična obremenitev;laboratorijske preiskave
Keywords (ePrints, secondary language):	liquefaction;earthquake;soil;dynamic load;laboratory testing
Abstract (ePrints):	Pojav likvifakcije je značilen za rahle, zasičene, drobnozrnate nevezljive zemljine. Tovrstne zemljine ob monotonih, impulzivnih ali ponavljajočih se obremenitvah (npr. ob potresu) težijo k zgoščanju, kar vodi v porast pornega tlaka in posledično do izgube strižne nosilnosti. V diplomski nalogi poskušamo preko terenskih in laboratorijskih preiskav potrditi oziroma ovreči sum na možnost pojava likvifakcije v drobnih peskih iz temeljnih tal na lokaciji energetskih nasipov za HE Brežice. Hkrati pa preverjamo tudi primernost raziskovanega lokalnega materiala za vgradnjo v energetske nasipe. Glede na indeksne kazalnike smo poskušali izbrati reprezentativne materiale za preiskavo dinamičnih lastnosti. S pomočjo laboratorijskih preiskav smo tako v kontroliranih pogojih določili vpliv različnih parametrov na pojav likvifakcije. Parametri, ki jih velja omeniti so količnik por, vlaga in količnik ciklične napetosti. Rezultate laboratorijskih preiskav, dobljene na preizkušancih pripravljenih v laboratoriju smo primerjali z rezultati preiskav narejenih na intaktnih vzorcih, odvzetih iz različnih plasti poskusnega nasipnega polja. Z laboratorijskimi preiskavami smo poskušali potrditi rezultate terenskih sondažnih preiskav in ocenili podobnost materialov iz temeljnih tal na lokaciji energetskih nasipov za HE Brežice z izbranim referenčnim materialom Toyoura peskom.
Abstract (ePrints, secondary language):	Phenomenon of liquefaction is characteristic for loose, saturated, fine-grained cohesionless soils. These soils tend to compact under monotonic, impulsive or repeating load (e.g. earthquake) which leads to the increase of pore water pressures and consequently to the loss of shear strength. Using “in situ” and laboratory tests the susceptibility of liquefaction of fine-grained sands under the flood embankments of the hydropower plant Brežice is investigated in the presented thesis. Suitability of this local soil for the construction of these embankments is also checked. With regard to index values representative material for investigation of dynamic properties of the soil was selected. Effect of different parameters like void ratio, water content and cyclic stress ratio on the liquefaction of the abovementioned soil was checked in controlled conditions in the laboratory. Obtained results from the samples prepared in the laboratory were then compared to the results on intact samples taken from different layers of the full scale test embankment. Results of laboratory tests were used for the evaluation of the results of in-situ investigations. Characteristics of the fine-grained sand from the hydropower plant Brežice were finally compared to Toyoura sand as a reference material.
Keywords (ePrints, secondary language):	liquefaction;earthquake;soil;dynamic load;laboratory testing
ID:	8309527