Temat: pore pressure - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ściśliwość wybranych gruntów drobnoziarnistych z centralnej Polski w warunkach stałego przyrostu obciążenia
Compressibility of fine-grained soils from central Poland during constant rate of loading tests
Autorzy:: Stajszczak, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/2087068.pdf
Data publikacji:: 2022
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Test CRL
ściśliwość
grunty spoiste
ciśnienie porowe
CRL test
compressibility
cohesive soils
pore pressure
Opis:: The article presents the results of CRL research on Mio-Pliocene clay and glacial till. The research has shown that the compressibility of fine-grained soils during a constant rate of loading tests depends on the physical properties of the soil and the adopted loading velocity. The research made it possible to determine the role of pore pressure in shaping the values of parameters describing the compressibility of cohesive soils.
Źródło:: Przegląd Geologiczny; 2022, 70, 7; 503--512
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Ocena parametrów filtracyjnych iłów warwowych ze stanowiska Plecewice k. Sochaczewa w warunkach in situ
Assessment of permeability parameters of in situ tested varved clays from Plecewice near Sochaczew
Autorzy:: Zawrzykraj, P.
Powiązania:: https://bibliotekanauki.pl/articles/2075674.pdf
Data publikacji:: 2017
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: piezometr BAT
dylatometr Marchetti
przewodnictwo hydrauliczne
ciśnienie porowe
dyssypacja
BAT piezometer
Marchetti dilatometer
hydraulic conductivity
pore pressure dissipation
varved clays
Opis:: Vistulian Glaciation ice-dammed lake clays with a varved texture were investigated. The study was focused on numerical determination of horizontal permeability depending on the depth and clay content. Direct assessment of these parameters is a rather complex and time-consuming issue. Therefore, a shortened methodology is offered based on the obtained relationships and the analysis of the dissipation process of excess pore pressure. The studies included mainly in situ tests: Marchetti dilatometer test (DMT) and BAT piezometer test. These methods allowed obtaining the values of the coefficient ofpermeability kh and changeability ofpore pressure u0 in a vertical profile. Investigations included 17 permeability tests using a BAT piezometer and 6 measurements of the coefficient of permeability kh, based on dissipation DMT tests. Results of in situ tests were compared with laboratory test results of the clay content. Values of the horizontal coefficient ofpermeability kh were correlated with the clay content f of varved clays. This relationship shows a high coefficient of correlation. A new formula was also proposed for the prediction of the coefficient of permeability kh in varved clays based on the pore pressure u0 stabilization curve, and thus shortening significantly the process of the coefficient kh determination.
Źródło:: Przegląd Geologiczny; 2017, 65, 9; 587--596
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Zmiany ciśnienia porowego w warunkach stałego wzrostu obciążenia i ich wpływ na konsolidację CL na przykładzie wybranych gruntów spoistych centralnej Polski
Pore pressure changes during consolidation tests with the constant rate of loading and their influence on CL consolidation, as exemplified by selected cohesive soils from central Poland
Autorzy:: Stajszczak, Piotr
Dobak, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/2076153.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: ciśnienie wody w porach
test CRL
konsolidacja CL
grunty spoiste
pore water pressure
CRL test
CL consolidation
cohesive soils
Opis:: The article presents the results of CRL tests of cohesive soils of different origins and grain size compositions. The aim of the work is to investigate the relation between the physical properties of cohesive soil and the course of loading and the nature of pore pressure changes during CL consolidation. The implemented program of laboratory tests confirms the significant role of pore water pressure in the assessment of seepage and consolidation parameters. The CRL research was supplemented by observations in a scanning electron microscope.
Źródło:: Przegląd Geologiczny; 2021, 69, 12; 873--883
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Ocena doświadczalnych rozkładów ciśnienia porowego w badaniach konsolidometrycznych typu CL
The assessment of pore pressure experimental distributions during continuous loading (CL) consolidation tests
Autorzy:: Kowalczyk, S.
Powiązania:: https://bibliotekanauki.pl/articles/2074386.pdf
Data publikacji:: 2005
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: konsolidacja gruntów
ciśnienie wody w porach
parametr ciśnienia porowego
consolidation
CL consolidation test
variability of pore water pressure
parameter C_CL
Opis:: The pore pressure variations that were obtained during CL consolidation tests are discussed in this paper. The comparative analysis was made on the base of observed changes to confront information on experimen-tal soil behavior with theoretical solutions of the primary (filtration) consolidation process. On the basis of obtained experimental data, the factors resulting in the incompatibility with the theoretical models, were identified and discussed in this paper. This incompatibility results from degree of saturation, conditions of dispersion of pore water pressure and load rate path.
Źródło:: Przegląd Geologiczny; 2005, 53, 2; 162-167
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Zmiany mikrostrukturalne past gruntowych pod wpływem ciśnienia ssania
Microstructural changes in remoulded specimens due to suction pressure
Autorzy:: Wójcik, E.
Trzciński, J.
Łądkiewicz, K.
Powiązania:: https://bibliotekanauki.pl/articles/2075002.pdf
Data publikacji:: 2013
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: microstructure
pore space
Neogene clay
suction pressure
mikrostruktura
przestrzeń porowa
iły neogeńskie
ciśnienie ssania
Opis:: This paper presents an issue of microstructural changes in clay soils during the water loss due to increase of suction pressure. The change of microstructure affects the geological engineering properties of soils causes problems with the foundation of buildings. The volumetric changes of cohesive soils, containing significant amounts of clay minerals from the smectite group, are caused by a variable water content in soil. The phenomenon of the moisture change significantly alters the geological engineering properties of these soils as a result of shrinking and swelling. This paper aims at presenting the microstructural changes in remoulded specimens of Neogene clays caused by loss of moisture due to suction pressure. The scientific examination involved quantitative analyses of the microstructure using scanning electron microscopy (SEM) to study pore space details of remoulded specimens. Tested samples from selected levels of the Neogene clays (Poznan Series) were collected from the Warsaw-Stegny area. Samples were taken from a research polygon for these clay soils. The basic geological engineering properties of clay soils and remoulded specimens have been examined after being prepared according to strictly defined procedures. Through successive stages of the suction pressure (from 50 to 1600 kPa), the samples underwent the process of loss of moisture. Application of a novel method of sample preparation procedure for remoulded specimens allowed examining structurally homogeneous soils and obtaining results without an effect of material anisotropy. The qualitative and quantitative analysis of soil microstructures were performed using SEM and STIMAN software for quantitative images processing. The analysis allowed determination of the number of geometric and morphometric parameters of the microstructure with high accuracy. Based on this study, significant qualitative and quantitative changes in loss of moisture due to suction pressure in the process of remoulded specimens were noted along with changes in the microstructure and pore space of clay soils. The obtained results showed the effect of successive stages of "closing" of the structure of cohesive soils. Microstructural changes have a significant influence on the values of clay soil properties during the shrinkage and swelling process, which are caused by changes in the water content.
Źródło:: Przegląd Geologiczny; 2013, 61, 1; 74--82
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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