Sarunas Skuodis

Vilnius Gediminas Technical University | VGTU · Department of Reinforced Concrete Structures and Geotechnics

In this manuscript, we present the results of three-dimensional finite element analyses performed in the cloud of a large-scale model of the Gediminas Hill buildings and the construction remains of the Upper and Lower castles in Vilnius city. The greatest challenge associated with the simulated numerical model is the difficult geological layer surfac...

Simplified methods based on cone penetration test results are commonly used to determine soil deformation modulus, depending on the engineering geological and geotechnical conditions and the complexity of the computational approach. This paper reviews some empirical equations based on the results of the cone penetration test and gives recommendatio...

The calculation of the frost depth is included in the geotechnical design for the Lithuanian region. The average temperature could be below zero for three months a year and maximum seasonal frost depth reaches more than 1.5 m. The analysis has shown that the frost has been declining for the last 200 years, which has intensified particularly in rece...

In Lithuania, the upper part of the Earth's crust was formed during the Pleistocene. Only a small part of Lithuania is a relic of the previous Medininkai stage (Lonian) glaciation in the Middle Pleistocene (Chibanian Age), which occur on the surface only in the southeastern area. Medininkai glacial period till soils are an almost unstudied soil typ...

This research article represents the recompacted dense sand sample behaviour and stress distribution in the direct shear box. In Lithuania, sand is quite common on a construction site, in general about 32%. To reduce the influence of the shear box design on the experimentally determined values of the soil strength parameters, it is necessary to kno...

This research work represents updated results of cohesive soil strength improvement with mineral wool fly ash. In the investigations, these materials were used: Portland cement CEM I 42.5 R, fly ash obtained from a mineral wool production process, sand and clay. Mixtures were prepared as follows: dry mixing of Portland cement and fly ash; dry mixin...

Sand–bentonite mixtures are used in road embankments as a protective material for protecting underground high-voltage cables and utility pipelines supplying water and gas etc. The sand–bentonite mixtures provide benefits while laying high-voltage cables. The purpose of this study is to determine the proportions as well as mechanical and thermal pro...

The surface of earth on the territory of Lithuania is covered by sediments of the Quaternary system, which are the object of human economic activities. Reliable assessment of sediment deformations is an important task of modern engineering geology and geotechnical engineering. The deformation of sediments is most often described using the modulus o...

Geogrids are widely used in civil engineering projects to reinforce road and railway structures. This paper presents research on the shearing strength of soil samples that have been reinforced with geogrids. The relationship between soil and geogrids is explored and evaluated by modeling the mechanical behavior of heterogeneous materials. For the p...

The aim of this article – to determine short term and long term strengthening of clay soil, by strengthening it with fly ash obtained during the production of mineral wool. This article introduces research which is used to determine the optimal ratio of fly ash in cement suspension for strengthening of clay soil. Samples which were investigated in...

This research paper represents interpretation of engineering geological and geotechnical conditions by using a direct shear device with a possibility to apply hydrostatic pressure during the experimental testing. In the authors’ opinion, the evaluation of in-situ hydrostatic pressure and reconstruction of it in the laboratory tests is a very import...

When determining the soil strength parameters with direct shear box devices, the values of the parameters are influenced by devices construction. In assessing this effect, it is necessary to know the magnitude of the vertical stresses and the nature of the distribution in the shear plane. The soil shear resistance depends on the size of the vertica...

Triaxial test is widely used to determine the behaviour and strength parameters of soil. Several consolidated drained triaxial compression tests were performed on two specimen sizes of sand and clay. This article investigate and compares the influence of specimen size and scale effect on the soil shear strength. The tests results show that the shea...

Glacial deposits make up the biggest volume of deposits of the Quaternary system in Lithuania. The deposits of the Medininkai glacial period are spread across the entire territory of Lithuania, but occur on the surface only in the southeastern area. The main purpose of this study is to explore the stiffness and deformation of till soils of the Medi...

Straipsnyje yra apžvelgtos grunto liekamosios deformacijos ir įvertintas liekamasis grunto deformacijų modulis esant skirtingam grunto apkrovimų ciklų kiekiui. Šie tyrimai leidžia prognozuoti inžinerinio geologinio pagrindo, kuris perima apkrovas, elgseną esant skirtingam apkrovimo ciklų kiekiui (intensyvumui). Bandymai atlikti su triašio slėgio ap...

Straipsnyje apžvelgtos grunto kerpamojo stiprio savybės, kai gruntui armuoti yra naudojami geotinklai. Pastaruoju metu šis metodas Lietuvoje yra plačiai taikomas statybų srityje, tiesiant kelius ir geležinkelius. Triašio slėgio bandymuose tirti vieni iš dažniausiai grunto armavime naudojamų lanksčių ir standžių geotinklų, kurių stipris tempiant iši...

Straipsnyje apžvelgiamos Medininkų ledynmečio periodo moreninių gruntų mechaninės savybės. Pagrindinis tyrimo tikslas – laboratoriniais metodais nustatyti moreninio grunto mechanines savybes ir jas palyginti su pateiktomis literatūroje. Remiantis lauko tyrimų metodu – statinio zondavimo duomenimis (qc, fs), nagrinėjamas gruntas yra labai stiprus. N...

Straipsnyje apžvelgtos grunto kerpamojo stiprio savybės, kai gruntui armuoti yra naudojami geotinklai. Pastaruoju metu šis metodas Lietuvoje yra plačiai taikomas statybų srityje, tiesiant kelius ir geležinkelius. Triašio slėgio bandymuose tirti vieni iš dažniausiai grunto armavime naudojamų lanksčių ir standžių geotinklų, kurių stipris tempiant iši...

Gediminas Hill and Gediminas Castle Tower at the centre part of Vilnius are highly important architectural monument which is symbolic of Lithuania. According to official documentary records, the Gediminas Castle was first mentioned in year 1323. Due to natural (glacial geology and hydrogeology) and anthropogenic (artificial activities and warfare)...

An experimental and numerical investigations of the direct shear test have been performed under constant vertical stress (q = const) and constant sample volume (h = const). During the determination of soil shear strength in a laboratory by different test methods soil is loaded in a different way. This fact has an influence on stress-strain distribu...

This article compares the soil strength parameters obtained from data of triaxial compression and direct shear tests, both with dense samples of fine sand. Direct shear device and triaxial device have significant differences in stress – strain state, which is developed in the specimen during test. In order to evaluate the stress-strain state, the d...

Šiame straipsnyje aprašyti pirminiai bandymai ir jų rezultatai kerpant smėlinį gruntą tiesioginio kirpimo aparatu, kai viso bandymo metu bandinys yra visiškai prisotintas vandens ir jame sukuriamas hidrostatinis slėgis. Tyrimai atliekami su Baltijos jūros pakrantės smėliniu gruntu, kuris dėl savo savybių gali būti vadinamas etaloniniu gruntu. Anali...

The paper presents an application of statistical and numerical methods for the determination of the forcedisplacement curves and that of pullout capacity of prestressed grouted ground anchors installed in Miocene clay. A regression analysis of data from a database of acceptance test records for ground anchors to create has been performed, the force...

An experimental measurements of the funicular generated vibrations provided after Gediminas Hill North part slope landslide, which occurred on 2016. The geology of Gediminas Hill made up strata of Quaternary system late Pleistocene glacial and glaciofliuvial coarse and fine deposit.The purpose of this measurement was to determine, whether funicular...

The primary purpose of this paper is to investigate the influence of loading procedure type. To reach this aim, we have chosen the Baltic Sea Klaipėda sand, due to granulometry composition and particles shape. The paper examines several key aspects of sand compression type, namely comparison between one-step (constant rate loading) and step-wise (i...

Investigations of soil shear strength properties for Baltic Sea shore sand along Klaip?da city is presented. Investigated sand angle of internal friction (?) and cohesion (c) is determined via two different direct shear tests procedures. First procedure is standard and ordinary in geotechnical practice, when direct shear test is provided using cons...

The paper examines several key aspects of soil morphology, namely experimental and numerical test validation and compression test result dependency on changing morphology parameters. The present chapter describes investigation of soil morpholo‐ gy parameters influence for numerical compression properties with evaluation of examined sand engineering...

This manuscript represents investigation of six different clay mixtures under variable drying conditions, namely: bright yellow clay (typical for Lithuania), brown clay (Lithuania Sergėnai district), mixture of different clays, white Spanish clay, clay mass which is resistant for thermal coldness (with synthetic cardigan) and Lithuanian coarse clay...

The article considers the peculiarities of determining quartz sand shear strength according to the Mohr-Coulomb strength criterion, via a direct shear test and that of factors influencing the characteristic angle of internal friction and cohesion values of the obtained strength parameters. The air-dry sand of the Baltic Sea region from Lithuanian c...

The dissertation investigates soil morphology parameters influence for me-chanical properties with evaluation of examined sand engineering geologi-cal conditions. The main objects of research: morphology parameters inves-tigation with view analysis program and SEM; experimental soil comp-ression and direct shear tests; numerical soil compression si...

Investigations of soil shear strength properties for Baltic Sea shore sand along Klaipėda city are presented. Investigated sand angle of internal friction (φ) and cohesion (c) is determined via two different direct shear tests procedures. First procedure is standard and ordinary in geotechnical practice, when direct shear test is provided using con...

Compressibility of silica sand grains is investigated by tests and via numerical simulation, validation of obtained results performed. The Baltic Sea shore sand in Klaipėda region was used. Shape of sand grains was analyzed by scanning electronic microscope (SEM) and view analysis program "STIMAN". The determined morphological parameters of sand gr...

Compressibility of quartz sand from the Lithuanian coastal area in Klaipeda environs is investigated by testing and numerical simulation, with validation of obtained results. The shape of sand grains has been analysed with a scanning electronic microscope (SEM). The determined morphological parameters of sand grains are employed to create discrete...

This work presents experimental and numerical view analysis on typical Baltic sea-shore sand along Klaipėda. Natural sand was analyzed under laboratory conditions of soil morphology parameters investigations. Form coefficient for natural sand particles and recreated particles via DEM technique was analysed. Additionally was analysed natural sand pa...

The paper presents experimental tests on typical Baltic sea-shoresand along Klaipėda. Natural sand was analyzed under laboratoryconditions following two different test procedures for soilcompression applying a universal oedometer and simple shear testdevice. The conducted analysis was concentrated on the influenceof the applied contact between soil...

An analysis of test results performed by common type of direct shear apparatuses shows that normal stress on the shear plane of soil sample is not equal to vertical component of distributed external load applied to the top of soil sample. Performed measurements cleared that only 65–85% of total vertical load is transmitted to the sample shear plane...

The paper presents experimental tests on typical Baltic sea-shoresand along Klaipėda. Natural sand was analyzed under laboratoryconditions following two different test procedures for soilcompression applying a universal oedometer and simple shear testdevice. The conducted analysis was concentrated on the influenceof the applied contact between soil...

Investigation of the shear strength properties of Klaipėda sand by simple shear test is presented. The characteristic values of the angle of internal friction φk and the cohesion ck are obtained via the least squares method and various factors of influence are elucidated. The investigation reveals the test quantity to have a significant influence o...

An experimental investigation of the shearing conditions and their influence to the strength properties of Klaipėda sand by the universal shear device is presented. The shear tests for the loose and dense soils were realized for constant vertical stress (q = const.) and for constant sample volume (h = const.), respectively. Loading was supplied on...

Da ugeliu atvejų tikroji polio laikomoji galia gali būti nustatyta natūraliomis sąlygomis atlikus polio laikomosios galios statinius arba dinaminius bandymus bei atlikus skaitinį dinaminių bandymų modeliavimą. Pateikiama idealizuota polio bandymo arba kalimo sistema, kuri apima plaktą, kalimo sistemą ir grunto savybes. Nurodoma, kokia informacija r...

Santrauka. Straipsnio tikslas – ištirti Baltijos jūros smėlinių gruntų ties Klaipėdos pakrante didžiausius poringumo koeficientus, palyginti atskirų frakcijų spūdumo rezultatus tarpusavyje, išnagrinėti atskirų grunto frakcijų spūdumo kitimą laiko atžvilgiu. Palyginti atskirų smėlio frakcijų tyrimų rezultatus su vienodais kiekiais (pagal masę) sumai...

Straipsnio tikslas – pagal gautus skaitinių ir eksperimentinių bandymų rezultatus nustatyti morfologinių parametrų įtaką deformacinėms grunto savybėms. Skaitiniams ir eksperimentiniams bandymams smėliniai gruntai buvo pasirinkti atsižvelgiant į skirtingas dūlėjimo aplinkas iš keturių vietovių: Baltijos Jūros ties Klaipėdos ir Palan-gos pakrantėmis,...

1,3 VGTU STF Geotechnikos katedra 2 VGTU FMF Skaitinio modeliavimo mokslo laboratorija El. p. 1 Sarunas.Skuodis@vgtu.lt; 2 Darius.Markauskas@vgtu.lt; 3 Agata.Sleckuviene@vgtu.lt Anotacija. Nagrinėjamos Baltijos jūros pakrantės smėlio ties Klaipėdos pakrante spūdumo savybės, atliekant ekspe-rimentinius ir skaitinius bandymus diskretinių elementų met...

The evaluation of the settlement of a square shallow foundation on a sand soil is presented in this article. A series of methods have been taken under consideration, some of which are directly related to in situ test results, and the analysis of the findings shows that the uncertainties about the soil parameters determination could be overcome by s...

Investigation of the compression properties of Klaipda sand by oedometric testing and numerical modeling is presented. Klaipda sand is characteristic of the Baltic seashore region sand. Experimental investigation was performed with fraction corresponding to diameter variation bounds of 0.6 and 0.425 mm. Compression test was realized with initial ma...

An influence of the end boundary conditions to distribution of stress and strains in a soil specimen during conventional compression triaxial tests is analyzed by the experimental and numerical methods. An evaluation of actual stress state is important when determining the shear strength parameters of soil. These methods are used in this paper to i...

Santrauka. Straipsnio tikslas – ištirti smėlinio grunto granuliometrinės sudėties kitimą atliekant skirtingų apkrovimo laips-nių spūdumo bandymus naudojant kompresinį aparatą ir pagal gautus spūdumo bandymus nustatyti staigių nuosėdžių ribas. Tyrimams atlikti naudotas Baltijos jūros pakrantės smėlis ties Klaipėdos pakrante. Spūdumo bandymams atlikt...

Santrauka. Nagrinėjamos Baltijos jūros pakrantės smėlio ties Klaipėdos pakrante spūdumo savybės, esant kontroliuojamam vertikalaus įtempio pokyčiui grunto bandiniuose. Spūdumo bandymai atlikti esant šiems apkrovimo greičiams: 25,0; 50,0; 100,0; 200,0; 400,0 ir 800,0 kPa/min. Spūdumo tyrimai atliekami su didžiausio poringumo bandiniais ir apspaudžia...

Santrauka. Straipsnio tikslas – nustatyti ir aprašyti morfologinius parametrus, kurie yra reikalingi skaitiniam mechaninių sa-vybių modeliavimui, taip pat, apžvelgti tyrimo metu susidarančias problemas. Mikroskopinis dalelių tyrimas atliekamas Bal-tijos jūros smėliniams gruntams ties Klaipėdos pakrante, nes tokie gruntai yra lengviau tiriami, dėl n...

Santrauka. Grunto deformacijų modulis E yra vienas iš dydžių apibūdinančių grunto deformatyvumą, šis modulis naudo-jamas pastatų ir įvairių geotechninių konstrukcijų nuosėdžiams skaičiuoti. Yra sukurta įvairių deformacijų modulio nustaty-mo metodų, tačiau jais sunku nustatyti giliai slūgsančių grunto sluoksnių deformacijų modulį. Todėl buvo pradėta...

This masters work purpose is to estimate loadings in construction; calculate foundations dimensions; calculate separate foundations displacements; compare separate foundations displacements between themselves; find relative displacements values and estimate contiguous foundations via geological difference; estimate sand different partical size comp...

In most cases, the bearing capacity of the pile under natural conditions can be determined by applying static and dynamic pile tests as well as the numerical modelling of a dynamic test. Th e integrated business problem is employed for calculating vertical displacements. Th is integral is calculated using the summing method. In the majority of case...

Vilniaus Gedimino technikos universitetas El. paštas: 1 sarunas.skuodis@stst.vgtu.lt; 1 kestutis.kelevisius@vgtu.lt Santrauka. Šiame straispnyje nagrinjama smlinių gruntų grūdelins sudties poveikis tanklumui ir spūdumui lyginant la-boratorinius ir lauko bandymų rezultatus. Lauko sąlygomis natūralaus grunto dinaminis deformacijų modulis gautas E vd...

Vilniaus Gedimino technikos universitetas El. paštas: 1 sarunas.skuodis@stst.vgtu.lt Santrauka. Šiame straipsnyje nagrinjamas Baltijos jūros smlinių gruntų ties Klaipdos pakrante optimalios smlio frakcijų sudties mišinio (pagal masę) radimas. Grunto tyrimai atlikti su kompresiniu aparatu naudojant tokias orasausio smlio frak-cijas: 2,0–0,6 mm, 0,6–...

This work presents experimental tests of typical Baltic sea-shore sand along Klaipėda. The loaded soil porosity coefficient changes of using different particle size fractions of Klaipėda sand are investigated. Three different sand particle size fractions have been analyzed at laboratory testing, namely: 1,18-0,6mm; 0,6-0,425mm and 0,425-0,3mm. In a...