Abstract This paper examines sand particles from the southern part of Lithuanian mainland area Baltic Sea. The constant movement caused by waves in coastal zone results creating smooth, near-spherical particle shapes. Such shapes are suitable for modeling spherical harmonics (SH). Therefore, presents methodology expansion and demonstrates suitability SH model to represent shape a particle. presented this demonstrated that required accuracy can be retained smaller number functions, these...

An experimental and numerical investigations of the direct shear test have been performed under constant vertical stress (q = const) sample volume (h const). During determination soil strength in a laboratory by different methods is loaded way. This fact has an influence on stress-strain distribution sample. The finite-element method analysis also shows that during tests strain non-uniform. If we know real sample, it possible to determine deformation parameters more precise way or rate...

This article compares the soil strength parameters obtained from data of triaxial compression and direct shear tests, both with dense samples fine sand. Direct device have significant differences in stress – strain state, which is developed specimen during test. In order to evaluate stress-strain tests were simulated finite element program PLAXIS 3D.

Abstract Sand–bentonite mixtures are used in road embankments as a protective material for protecting underground high-voltage cables and utility pipelines supplying water gas etc. The sand–bentonite provide benefits while laying cables. purpose of this study is to determine the proportions well mechanical thermal properties dry-mixed mixture investigate suitability such installation around power lines embankments. When selecting mixture, following requirements must be ensured: compressive...

Geosynthetics play a pivotal role in modern infrastructure projects, with geogrids serving as common choice for enhancing bearing capacity and reducing soil settlement road construction. This study investigates the influence of density uniformity coefficients on geogrid-reinforced sandy gravelly soils through series consolidated drained triaxial tests. The research covers six distinct types from Lithuania, each characterized by particle size distribution analysis classified using various...

Non-destructive test methods are usually used for up to 2 months old bored concrete piles. It helps determine the properties of newly installed pile foundations. This research work represents a unique investigation 80 piles that tested with different non-destructive 34 years from installation. Therefore, main objective this article is provide an analysis testing (pile integrity (PIT); P-wave test; ultrasound (UPV)) results and suggestions prediction experimental results. Furthermore,...

The paper presents an application of statistical and numerical methods for the determination forcedisplacement curves that pullout capacity prestressed grouted ground anchors installed in Miocene clay. A regression analysis data from a database acceptance test records to create has been performed, force-displacement curve tested anchor corresponding range loads applied tests created. linear model, employing weighted least squares method robust standard errors techniques were concluded serve...

An experimental investigation of the shearing conditions and their influence to strength properties Klaipėda sand by universal shear device is presented. The tests for loose dense soils were realized constant vertical stress (q = const.) sample volume (h const.), respectively. Loading was supplied on top sample. testing cases variable gap between upper lower ring. stability rings that load indicator compression measured during tests. measurements resulted it not measurement found full bridge...

Abstract 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 geogrids is explored evaluated by modeling mechanical behavior heterogeneous materials. For purposes this research, data obtained from tests unreinforced sand triaxial cells were compared samples. It was found for higher (from 9% 49%) Some damage geogrid...

The article considers the peculiarities of determining quartz sand shear strength according to Mohr-Coulomb criterion, via a direct test and that factors influencing characteristic angle internal friction cohesion values obtained parameters. air-dry Baltic Sea region from Lithuanian coastal area near Klaipėda city has been analyzed. solid density investigated grains was ρs = 2.65 g/cm3. initial tested samples made ~1.48–1.50 Processing data on yielded quantity 18 tests sufficient for...

Compressibility of quartz sand from the Lithuanian coastal area in Klaipėda environs is investigated by testing and numerical simulation, with validation obtained results. The shape grains has been analysed a scanning electronic microscope (SEM). determined morphological parameters are employed to create discrete models (particle grains) subsequently used for compression test simulation via element method (DEM) techniques. background version DEM time-integration algorithm implemented...

Investigations of soil shear strength properties for Baltic Sea shore sand along Klaipėda city are presented. Investigated angle internal friction (φ) and cohesion (c) is determined via two different direct tests procedures. First procedure standard ordinary in geotechnical practice, when test provided using constant shearing area A0. Second because according to horizontal displacement each second recalculated. This recalculated author’s call corrected A. Obtained normal tangential stresses’...

The mechanical properties of pavement materials are crucial to the design and performance flexible pavements. One most commonly used measures these is resilient modulus (Er). Many different models were developed predict coarse soils, which based on states stresses physical soil. unconsolidated unsaturated drained cyclic triaxial tests performed for three variously graded well-graded sand specimens determine modulus, perform predictive modeling using K-θ, Rahim George, Uzan, Universal Witczak...

An influence of the end boundary conditions to distribution stress and strains in a soil specimen during conventional compression triaxial tests is analyzed by experimental numerical methods. evaluation actual state important when determining shear strength parameters soil. These methods are used this paper investigate simulate contact between testing equipment ends sand test. Two different sample boundaries analyzed: first case, friction machine not eliminated (fixed ends); second (free...

This work presents experimental tests on typical Baltic sea-shore sand along Klaipėda. The paper looks into changes in loaded soil void ratio when using different types of fractions Klaipėda region. Three fractions, including 1,18–0,6 mm, 0,6–0,425 mm and 0,425–0,3 were analyzed under laboratory conditions. In addition, one mixed fraction diameter 1,18–0,3 was created from the equal parts (in mass) these three fractions. Soil usually consists particles, water air. An important basic...

The primary purpose of this paper is to investigate the influence loading procedure type. To reach aim, we have chosen Baltic Sea Klaipėda sand, due granulometry composition and particles shape. examines several key aspects sand compression type, namely comparison between one-step (constant rate loading) step-wise (incremental oedometer tests. In manuscript, present investigation sandy soil character up maximum 400 kPa loading. This research shows difference two procedures. main objects...

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 sand clay. This article investigate compares influence size scale effect soil shear strength. The results show that are influenced by clay size. indicate sample more significant with higher confining pressures. second type carried out samples shows doesn‘t Author’s analyses can be significantly affected choice parameters.

The paper investigates typical Baltic sea-shore sand along Klaipėda and diagnoses the level of particle crushing after different loading steps. An oedometer test is done applying to drained loose (e0 = 0,764) dense 0,604) sand. used steps are 0,0; 200,0; 400,0; 600,0; 800,0 kPa. Investigation into made conducting a sieve employing spherical balls on sieves size. following levels. results grading curve show that kPa vertical stress does not crushes particles sample. analysis compression shows...

Investigation of the compression properties Klaipėda sand by oedometric testing and numerical modeling is presented. characteristic Baltic seashore region sand. Experimental investigation was performed with fraction corresponding to diameter variation bounds 0.6 0.425 mm. Compression test realized initial maximal void ratio (e 0 = 0.800) Employed vertical stress ramp value 800.0 kPa/min, maximum loading σmax 400.0 kPa. Applying within range 50.0 120.0, two jumps have been identified. A...

In this manuscript, we present the results of three-dimensional finite element analyses performed in cloud a large-scale model Gediminas Hill buildings and construction remains Upper Lower castles Vilnius city. The greatest challenge associated with simulated numerical is difficult geological layer surface inclinations soil–structure interaction behavior prognosis, which require significant computational resources. purpose research work to current possible worst-case scenarios for Hill,...

An experimental measurements of the funicular generated vibrations provided after Gediminas Hill North part slope landslide, which occurred on 2016. The geology made up strata Quaternary system late Pleistocene glacial and glaciofliuvial coarse fine deposit.The purpose this measurement was to determine, whether during exploitation is significant destabilizing factor. For vibration in X, Y Z directions were implemented equipment, developed by authors. Measurements 25 different points...

One of the main parameters characterizing soil deformations is deformation modulus, which can be determined in laboratory with an oedometer or a triaxial test device. The authors conducted experimental tests and apparatuses eight different type soils. Experimental data for types sands, clays, silts specially mixed grain size distribution curves, having non-plastic fines contents, mean sizes uniformity coefficients, were analyzed. In general, modulus obtained from higher than that test, due...

One of the main parameters characterizing soil deformations is deformation modulus, which can be determined in laboratory with an oedometer or a triaxial test device. The authors conducted experimental tests and apparatuses eight different type soils. Experimental data for types sands, clays, silts specially mixed grain size distribution curves, having non-plastic fines contents, mean sizes uniformity coefficients, were analyzed. In general, modulus obtained from higher than that test, due...