Gintaras Žaržojus

• PhD
• associate professor at Vilnius University

Oxygen-18 is an important indicator determining groundwater origin, recharge sources, and age. However, compared to basic geochemical parameters such as major ion composition, oxygen-18 is measured significantly less. This study aims to develop a machine learning (ML) model to successfully predict oxygen-18 values based on ionic composition (Na⁺, K...

Hydraulic conductivity (k) is a crucial parameter in hydrogeology and engineering geology, describing the rate at which water filters through porous media, i.e., soil. It can be determined directly through tests on soil samples in situ, or it can be calculated from other soil parameters using various equations and models. This study aims to compare...

Soil deformation moduli are affected by a number of factors including the intensity of applied load in drained or undrained conditions, stress-strain characteristics, confining pressure, stress history, and soil type. Determination of the deformation properties of glacial soils requires long-term research. As evidenced by a review of previous studi...

All the sediments discharged from the Quaternary glaciers differ in their granulometric and mineral composition. Tills, sands, and clays cover unevenly sized areas in various places. However, during engineering geological and geotechnical investigations, the most found types of till soil are sandy low plasticity clay (saClL), sandy low plasticity c...

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...

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...

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...

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...

Road and foundation deformations in modern Lithuanian construction are one of the most important problems. Constantly rising conflicts between customers and builders due to poor quality of foundations show that Lithuanian road builders do not ensure proper quality of work, do not perform the necessary road foundations and research, do not carry out...

The undrained soil strength is specific to fine soils or to sands with a lot of fines. It is very important characteristic and the evaluation of accurate value is significant step. The undrained soil shear strength can be estimated directly in laboratory and indirectly in field using in-situ methods. The values of undrained shear strength estimated...

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...

Medininkai glacial period moraine clay is almost unstudied soil type in Lithuania. Main research is almost in every case is finished with static cone penetration tests. Due to new construction site geological investigations, appeared an opportunity to provide experimental investigations with Medininkai glacial period moraine clay. In this manuscrip...

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...

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...

Dynamic penetration test (DPSH) is one of the large amount of soil in-situ tests are known. In world practice, this method usually used for granular soil investigations although it could be applied in cohesive soils. Correlation of received DPSH test results with soil properties is complex and often not reliable. Especially it becomes obvious after...

Grunto tyrimai atlikti ypač sunkiu DPSH-B tipo dinaminiu penetrometru. Šiuo penetrometru galima tirti įvairios granuliometrinės sudėties gruntų fizinę būklę, tačiau inžineriniuose geologiniuose tyrimuose daugiausia tiriami birūs gruntai. Bandymo metu gautų duomenų analizė yra sudėtinga, ypač tyrinėjant rišlius gruntus. Duomenų patikimumas priklauso...

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...

The paper describes the estimating settlements of bored piles foundation on the site of the Elektrenai power plant, Lithuania. The bored piles foundation supports equipment of the power plant consisting of the gas turbine, the steam turbine and the generator. The piling solution was adopted for the following reasons: i) the insufficient capacity of...

Static and dynamic probes are commonly used performing engineering geological investigations in Lithuania. Due to their peculiarities, static cone penetration tests (CPTu) are most suitable for penetration of relatively weak soils. In case of deeper soil layers covered with strong soils was investigated Dynamic penetration test (DPT) is the only th...

The correlation between the cone resistance and the shear wave velocities was derived for the Quaternary glacial clayey soil (moraine) using Seismic Cone Penetration Test (SCPT) technique. The correlation obtained between two parameters is as high as +0.73. The derived regression equation has significant differences from those of clayey soils repor...

The derivation of dynamic geotechnical parameters of soil are of primary importance in designing specific structures. Direct measurements are expensive and time-consuming. In this study the correlation between the seismic wave velocities and cone resistance was derived from seismic cone penetration testing (SCPT) of Quaternary glacial sandy soils i...

The paper analyses problems of correlation between the results of dynamic probing (DPSH - Super heavy dynamic probing) and cone penetration test. According to investigations of geological cross-sections of cohesive soils of the territory of Lithuania correlation dependencies are evaluated. Reliability of dynamic probing and modern methods of result...

Accomplished researches of deformations, which proceed when vibropiles are deepened into till soil. It is stated during the researches, that the format of deformations, which proceed in till does not conform to physical models of deformations accepted at this point in time. The general form of deformations is parabola. There were assigned zones of...