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Wyświetlanie 1-15 z 69
Tytuł:
Permeability coefficient tests in non-cohesive soils
Autorzy:
Wrzesiński, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/118730.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
permeability coefficient
non-cohesive soil
pumping test
consolidation test
groundwater
Opis:
The paper aims to comparison the permeability coefficient in non-cohesive soils by the method of test pumping and based on tests in a consolidometer. The tests were carried out on 18 types of non-cohesive soils with different fraction. Pumping tests were carried out according to the standard method i.e. by making one well with a diameter of 400 mm and installing two piezometers at different distances from the well. The water table change was measured in piezometers during water pumping from the well. Tests in the consolidometer were carried out on soil samples that were first compacted to the same density index as in the test site. The tests were carried out with a continuous inflow of water from below with constant gradients of 0.50. The tests presented in the paper allow to verify and compare the values of the permeability coefficient in non-cohesive soils determined in the field and laboratory tests.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 1; 72-80
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Partially Saturated Non-cohesive Soils
Autorzy:
Świdziński, W.
Mierczyński, J.
Mikos, A.
Powiązania:
https://bibliotekanauki.pl/articles/241293.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
partial saturation
liquefaction
pore pressure generation
triaxial conditions
Opis:
This paper analyses and discusses experimental results of undrained triaxial tests. The tests were performed on non-cohesive partially saturated soil samples subjected to monotonic and cyclic loading. The tests were aimed at determining the influence of saturation degree on soil’s undrained response (shear strength, excess pore pressure generation). The saturation of samples was monitored by checking Skempton’s parameter B. Additionally, seismic P-wave velocity measurements were carried out on samples characterized by various degrees of saturation. The tests clearly showed that liquefaction may also take place in non-cohesive soils that are not fully saturated and that the liquefaction potential of such soils strongly depends on the B parameter.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 3-4; 187-207
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instability line as a basic characteristic of non-cohesive soils
Autorzy:
Świdziński, W.
Mierczyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/241208.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
liquefaction
cyclic mobility
instability
Opis:
In the paper, the experimental results of undrained response of non-cohesive soil subjected to either monotonic or cyclic loading, are analysed and discussed. The analysis was based on the results of comprehensive testing programme made of "Skarpa" sand investigated in the triaxial compression. Two main undrained behaviours such as liquefaction and cyclic mobility were experimentally identified and studied. In the analysis of undrained behaviour, the concept of steady state of deformation has been adopted. It was shown that the undrained response of non-cohesive soils is governed by different failure mechanisms than in the case of drained samples. In undrained failure mechanism, an important role is played by an instability line, which may be identified with the initiation of potential liquefaction.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 1; 39-58
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of SEM to Analysis of Permeability Coefficient of Cohesive Soils
Autorzy:
Kozłowski, T.
Kurpias-Warianek, K.
Walaszczyk, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/241142.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
cohesive soils
permeability coefficient
SEM
NIA
cyclic freezing and thawing
Opis:
A series of experiments on samples of five clayey soils gave evidence that cyclic freezing and thawing significantly affects the permeability coefficient. An attempt to analyze these changes on base of the Scanning Electron Microscopy SEM photographs of microstructures has been made. A simplistic equation (Eq. 11) has been drawn, describing the permeability coefficient as a function of hydraulic radius and pore area. An approach to determine the permeability coefficient by Eq. (11) on base of SEM photographs, in which the pores were identified manually, yielded results comparable to the Falling Head Test (FHT). However, since the identification of pores in SEM photographs seems the critical point of the method, the Numerical Image Analysis (NIA) has been applied. The procedure of finding the optimum threshold Topt has been described, based on minimization of the deviation ?ki,j, calculated as the absolute value of the difference kSEM,i,j and kFHT,j, i.e. the permeability coefficients determined by the SEM analysis and FHT, respectively. It has been proved that the optimum threshold values can be described as a function of image parameters, i.e. mean grey level Lmean and standard deviation σ n.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2011, 58, 1-4; 47-64
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the initial shear modulus of selected cohesive soils
Autorzy:
Gabryś, K.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/178404.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
initial soil stiffness
cohesive soils
resonant column tests
Opis:
The paper concerns the evaluation of the initial stiffness of selected cohesive soils based on laboratory tests. The research materials used in this study were clayey soils taken from the area of the road embankment No. WD-18, on the 464th km of the S2 express-way, Konotopa-Airport route, Warsaw. The initial stiffness is represented here by the shear modulus (Gmax) determined during resonant column tests. In the article, a number of literature empirical formulas for defining initial value of the shear modulus of soils being examined were adopted from the literature in order to analyze the data set. However, a large discrepancy between laboratory test results and the values of Gmax calculated from empirical relationships resulted in the rejection of these proposals. They are inaccurate and do not allow for an exact evaluation of soil stiffness for selected cohesive soils. Hence, the authors proposed their own empirical formula that enables the evaluation of the test soils’ Gmax in an easy and uncomplicated way. This unique formula describes mathematically the effect of certain soil parameters, namely mean effective stress ( p′) and void ratio (e), on the initial soil stiffness.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 2; 3-9
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Thermoporometry Based on Convolutive DSC to Investigation of Mesoporosity in Cohesive Soils
Autorzy:
Kozłowski, T.
Babiarz, I.
Grobelska, E.
Powiązania:
https://bibliotekanauki.pl/articles/241378.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
pore distribution
thermoporometry
DSC (Differential Scanning Calorimetry)
montmorillonite
cohesive soils
Opis:
In the method of thermoporometry, the characterization of pore space is done by analysis of thermal effects associated with freezing and melting of a liquid in the pores of the material under investigation. Thermoporometry seems particularly well suited to studies of wet porous samples in cases where the process of drying itself is able to destroy the original microstructure, as is the cohesive soils containing montmorillonite. In the paper, a variant of thermoporometry is given in which the blurred calorimetric peak is processed by use of a stochastic-convolutive analysis. As a result, a "sharp" thermogram of real thermal effects is obtained which can be easily transformed into a pore distribution curve. The preliminary results, obtained for samples of three monoionic montmorillonites at different water contents, indicate a greater resolution, sensitivity and precision than the classical thermoporometry using an unprocessed DSC signal. Phenomena corresponding to swelling have been detected in two individual regions on the differential pore distribution curves. The first is a dense spectrum for pores less than 15 nm. The second is a single peak for pores greater than 15 nm. Between the two regions the distribution decays to zero. Apparently, the point of the single peak maximum depends on the total water content, shifting rightward with increasing w. For the region below 20 nm, a strong effect of the kind of exchangeable cation can be observed. The results suggest swelling in the form with bivalent cations (Ca-montmorillonite) and contraction in the form with monovalent cations (Na- and K-montmorillonite).
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2010, 57, 3-4; 199-218
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Saturation criteria for heavy overconsolidated cohesive soils
Kryteria pełnego nasycenia dla gruntów spoistych silnie prekonsolidowanych
Autorzy:
Lipinski, M.J.
Wdowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/81629.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
saturation criterion
heavy overconsolidated soil
cohesive soil
soil
mechanical property
Opis:
The paper concerns significance of properly carried out saturation procedure and its role in evaluation of undrained response of heavy preconsolidated cohesive soils. In particular the saturation criteria are addressed which should be fulfilled during saturation of preconsolidated clay specimens of various plasticity. Influence of incomplete saturation on shear strength parameters is briefly characterized. On the basis of experimental data the back pressure method is shown to be the most efficient method in obtaining full saturation in overconsolidated clay of various plasticity. Analysis of the test results made possible to propose full saturation criteria for low, medium and high plasticity clays which are based on reduced value of Skempton’s B parameter.
Jednym z najczęściej popełnianych błędów w laboratoryjnych badaniach właściwości mechanicznych gruntu jest niekontrolowany stan nasączenia gruntów. Artykuł dotyczy kryteriów, jakie powinny być spełnione podczas nasączania próbek różnych gruntów w badaniach trójosiowych. W pracy scharakteryzowano wpływ niepełnego wypełnienia porów gruntu wodą na błędy uzyskiwane w wynikach badań. Przedstawiono metodę ciśnienia wyrównawczego jako najbardziej skuteczny sposób doprowadzenia do pełnego nasycenia gruntu. Zaprezentowano wyniki badań dla prekonsolidowanych gruntów spoistych o różnej spoistości, tj. glin piaszczystych, glin i iłów. Analiza tych wyników pozwoliła na określenie minimalnych wartości parametru Skemptona B dla tych gruntów jakie powinny być spełnione dla otrzymania prawidłowej (niezafałszowanej) reakcji gruntu podczas ścinania w warunkach bez odpływu.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 2
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cone penetration test in assessment of soil stiffness
Autorzy:
Tschuschke, W.
Kumor, M. K.
Walczak, M.
Tschuschke, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060279.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
soil stiffness
SCPTU
cohesive soils
Opis:
The paper presents proposals for the assessment of subsoil stiffness based on results of the seismic cone penetration test. Correlations between penetration parameters and constrained modulus were determined for three genetically different groups of cohesive soils. For the analyzed soil material quantitative estimation was also conducted for the parameter, which determines the relationship between the constrained modulus and initial shear modulus. A marked trend was shown for this parameter with the soil behavior type index used in the classification of soils in the cone penetration test.
Źródło:
Geological Quarterly; 2015, 59, 2; 419--425
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Moisture content impact on mechanical properties of selected cohesive soils from the Wielkopolskie Voivodeship southern part
Autorzy:
Pezowicz, P.
Choma-Moryl, K.
Powiązania:
https://bibliotekanauki.pl/articles/178204.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soils consistency
shearing resistance
compressibility
Opis:
Results of investigations of shearing resistance and compressibility of fine-grained cohesive soil from the southern part of the wielkopolskie voivodeship in relation to the increasing moisture content are presented. The analysis of two series of samples, using soil paste for the consistency index of 0.9 and 0.4–0.3 was carried out. The results imply that the increasing moisture content causes a decrease in the angle of shearing resistance and cohesion and is also reflected in the higher compressibility of the soil. It was observed that regardless of the soil consistency, the angle of shearing resistance decreases and the cohesion value and the oedometric modulus of primary (consolidation) and secondary compressibility grows with the increase in the clay fraction.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 4; 37-46
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of cohesive soils improved with lime as an example of circular economy in earthworks
Autorzy:
Gosk, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2172406.pdf
Data publikacji:
2022
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
soil improvement
cohesive soil
excavation
backfill
compaction
poprawa gleby
grunt spoisty
wykop
zasypka
zagęszczanie
Opis:
A common practice in civil engineering during earthworks is the usual replacement of cohesive soils (fine soils), excavated during earthworks, with non-cohesive soils (coarse soils). Until recently, such a procedure was dictated primarily by economic and technical reasons. From an economic point of view, the ease of access and therefore low cost of using such soils instead of cohesive soils was crucial. The technical reason is, above all, the ease of compacting fine soils (as opposed to cohesive soils) and well-developed and well-known engineering methods for controlling their compaction. The situation changed radically when the new environmental regulations came into force and enforcement by the inspection authorities began. Currently, soil removed from a construction site according to regulations should be classified as waste. This fact has completely changed the approach of participants in the construction process to the use of local soils, especially cohesive soils (e.g. clays). Their use "on site" has stopped being an expensive option and has become a necessity. This paper presents aspects of the use of lime-improved cohesive soils that can be successfully used on site as excavation backfill. Problems related to the proper preparation of soil-lime composites are described, as well as the results of compaction tests. The paper presents the author's own methodology for selecting the content of quicklime in the soil-lime composite.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 3; 10--20
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lateral Earth Pressure in Non-Cohesive Soils, Reinforced with Geotextiles in the Light of Laboratory Research
Autorzy:
Surowiecki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/504036.pdf
Data publikacji:
2016
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
geotextiles
reinforcement
ground medium
earth pressure
Opis:
The subject of the paper is the non-cohesive medium layer with geotextiles reinforced as foundation in communication building engineering. The influence of horizontal bidirectional reinforcement on the change of value of horizontal pressure in the laboratory physical models of ground medium layer is estimated. The most important effects reinforcement have been observed, regarding increasing model load capacity.
Źródło:
Logistics and Transport; 2016, 32, 4; 81-88
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki warunkujące zmienność modułu odkształcenia gruntów spoistych
Factors subjecting variability of Youngs modulus of cohesive soils
Autorzy:
Wdowska, M.K.
Wudzka, A.
Powiązania:
https://bibliotekanauki.pl/articles/887507.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
geotechnika
grunty spoiste
modul odksztalcenia
odksztalcenia pionowe
Źródło:
Scientific Review Engineering and Environmental Sciences; 2006, 15, 1[33]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow coefficient of the aggregates as a parameter characterizing the suitability of non-cohesive soils for earthworks
Autorzy:
Majer, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/118735.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
flow coefficient of aggregates
uniformity coefficient
Opis:
The article presents the results of the flow coefficient of aggregate for 30 sands and aggregates. The introduction of European standards for the assessment of construction aggregates over 20 years ago introduced a number of new testing methods not previously used in Poland. One of them is the flow coefficient of aggregate, popularly called aggregate angularity. The method of determination is given in the standard PN-EN 933-6:2014. This standard defines the method of determining the index for coarse aggregates with grain sizes between 4 and 20 mm and fine aggregates with grain sizes below 2 mm. This test is particularly important when designing mineral-asphalt mixtures. Aggregate angularity, particularly in fine aggregates, is the main factor influencing the workability of mixtures. The flow time through the apparatus depends on the degree of roundness and form of the grain. The study determined the relationship between the flow coefficient of aggregate and CBR in relation to the uniformity coefficient. This indicator is still considered to be one of the main parameters that affect the suitability of non-cohesive soils in earthworks. It was proven that Ecs is more dependent on CBR than CU.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 298-307
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of mineralogical composition of soil on the consolidation coefficient value
Wpływ składu mineralnego gruntów na współczynnik konsolidacji
Autorzy:
Zabłocka, K.
Lendo-Siwicka, M.
Wrzesiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/2083971.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
consolidation
consolidation coefficient
clay mineralogy
cohesive soils
Opis:
This paper involves the results of oedometric tests carried out on four model samples with different content of expansive clay minerals, subjected to different stresses. The research aimed to determine the impact of consolidation pressure on the consolidation coefficient for cohesive soils with different mineral composition. Main factors influencing correlation between consolidation coefficient and consolidation pressure (Cv–p) trends turned out to be mechanisms controlling changes in soil volume (mechanical or physicochemical), which is different for expansive and non-expansive soils.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2020, 19, 3; 83-90
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of consolidation parameters in CL tests; theoretical and practical aspects
Autorzy:
Dobak, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059088.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
consolidation
cohesive soils
continuous loading
pore water pressure
Opis:
The paper presents theoretical solutions of the consolidation problem with respect to the different conditions of continuous loading and its application. The author introduces modified consolidation parameters and dimensionless parameters characterizing the course of the consolidation process. Therefore it is possible to calculate the theoretical pore water pressure distribution for various loading procedures in continuous loading (CL) consolidation tests occurring in constant rate loading (CRL), constant rate of strain (CRS) or controlled gradient (CG) tests. The calculation results allow presentation of the attributes that differentate CL consolidation and classical incremental loading (IL) consolidation. A new method of calculation cv (coefficient of consolidation) is proposed using theoretical diagrams of porewater pressure distribution and results of laboratory measure ments during the CL test. A comparative analysis of the methods currently used for cv calculation and the new method is presented here. The cv values estimated by means of method referring only to the seepage factor of consolidation, are usually higher than those based on the strain course. Proper projection of the seep age factor of consolidation makes it possible to shorten the time of consolidation tests in accordance with results of many field observations. The methods described herein can be useful in studying physical conditions of sedimentation, glacial geology, early diagenetic process and applied geology.
Źródło:
Geological Quarterly; 2008, 52, 4; 397-397
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
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