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Wyszukujesz frazę "pore pressure" wg kryterium: Temat


Tytuł:
Uni-axial liquefaction wave in saturated sands
Jednowymiarowa fala upłynnienia w nawodnionych piaskach
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/281385.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
liquefaction
pore pressure
saturated soils
waves
Opis:
A compaction theory is applied to description of stress wave propagation through saturated sands, including such associated phenomena as pore pressure generation and liquefaction. Numerical examples show that liquefaction is possible during either loading or unloading, depending on the magnitude of applied stress and mechanical properties of saturated sand. It is shown that the stress wave propagates without change of shapes but produces regrouping of the intrinsic stresses in matrix and fluid, i.e. generating excess pore pressure and reducing mean effective pressure, which leads to liquefaction. Those effects are caused by permanent porosity changes due to rearrangement of the granular structure of the sand, and pore water compressibility.
Przedstawiono zastosowanie teorii zagęszczania do opisu propagacji jednowymiarowej fali upłynnienia w nawodnionych piaskach. Wykazano, że upłynnienie jest możliwe zarówno podczas procesu obciążenia jak i odciążenia w zależności od wielkości naprężeń oraz od właściwości mechanicznych materiału. Pokazano, że fala globalnego naprężenia propaguje się bez zmiany kształtu. Procesowi temu towarzyszy przegrupowanie naprężeń parcjalnych w składnikach mieszaniny, tj. generowane jest ciśnienie porowe, któremu towarzyszy redukcja naprężeń efektywnych w szkielecie gruntowym. Zjawisko to prowadzi do upłynnienia nawodnionego gruntu.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 3; 681-701
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The importance of the formation and fracture pressures for the selection of the depths for casing setting in Slovakia
Autorzy:
Pinka, J.
Kucirkova, L.
Powiązania:
https://bibliotekanauki.pl/articles/298914.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
casing strings
fracture pressure
pore pressure
fracture gradients
Opis:
Different oil companies place shallow casing strings at different depths. Apparently there is no general method or procedure that gives the optimal location. This article is an attempt to define this optimum casing seat location. The potential benefits will improve safety and economy of the operation. The two major factors determine the depth of the casing shoe, that is, the fracture pressure and the pore pressure. A third factor is the lithology, because it is desirable to place the casing shoe in a competent shale section. The methods of predicting fracture gradients for deeper wells already exist. In this article, a method of predicting fracture gradients for shallow well has been derived. This method is combined with kick tolerance criteria to obtain a casing depth selection method. Also, the variation in fracture pressures at any depth has been investigated.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 2; 381-394
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
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:
Soft Soil Overconsolidation and CPTU Dissipation Test
Autorzy:
Bałachowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241488.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
CPTU
DMT
pore pressure
stress history
soft soil
Opis:
Stress state and stress history of subsoil under the flood embankment was evaluated with CPTU and DMT tests. The CPTU dissipation tests in soft soils under the central part of the embankment and on the upstream and downstream sides were performed. The shape of pore water dissipation curve reflects stress state and stress history. Monotonic decay of water pore pressure was found for normally consolidated soils. Dilatory pore pressure response is typical for overconsolidated soils. Methods for the flow characteristics determination (coefficient of consolidation and hydraulic conductivity) were presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 2; 155-180
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smart levee in Poland. Full-scale monitoring experimental study of levees by different methods
Autorzy:
Sekuła, K.
Borecka, A.
Kessler, D.
Majerski, P.
Powiązania:
https://bibliotekanauki.pl/articles/305551.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ISMOP
smart levee
pore pressure measurement
temperature measurement
Opis:
This paper presents two types of control and measurement networks used in the levee built as part of the ISMOP project. The first control and measurement network based on pore pressure and temperature sensors. Additionally, it contains the fiber-optic technology. The second network include design experimental sensors, constructed for the development of solutions that can be used in existing flood embankments.
Źródło:
Computer Science; 2017, 18 (4); 357-384
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some effects of intrinsic cyclic loading in saturated sands
Autorzy:
Sawicki, A.
Mierczyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/279931.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
saturated sand
cyclic loading
pore pressure
triaxial tests
deformations
Opis:
This paper presents original results of triaxial experiments performed at a cyclically changed pore pressure (intrinsic cyclic loading). The results display unusual behaviour of saturated sand subjected to such atypical loading. Some features of this behaviour are shown, including the following effects: static liquefaction of initially contractive sand, apparent creep of initially dilative sand, initial anisotropy, etc. Some differences between the classical geotechnical understanding of the effects of external cyclic loadings (such as earthquakes) and those caused by intrinsic cyclic loadings (such as wave-induced pressures) are discussed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 285-293
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground liquefaction and deformation analysis of breakwater structures under earthquakes
Autorzy:
Zhao, J.
Wang, Y.
Yun, G.
Ashraf, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/258448.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
breakwater
seismic design
liquefaction
excessive pore pressure ratio
displacement
Opis:
Ground liquefaction and deformation is one of the important causes that damage engineering structures. Chinese current code for seismic design of breakwater is based on the single-level seismic design method as well as code for port and water-way engineering. However, this code can not exactly reflect the seismic performance of breakwater structures which experience different seismic intensities. In this paper, the author used a finite difference software, namely, FLAC3D, to analyze the state and compute seismic responses of breakwater structure. The breakwater foundation’s pore pressure ratio and displacement due to different earthquake have been studied. And the result show that: Smaller earthquakes have little influence on serviceability of the foundation, and severe earthquakes can liquefy some parts of the foundation; In the latter case , obvious changes of pores and foundation displaces can be found. Particularly, when seismic peak acceleration reachs 0.2g, Liquefaction appears in the foundation and mainly concentrated in the upper right side of the structure. In addition, the survey of ultra-hole pressure and displacement values of sand layers of the breakwater, manifests when the ultra pore pressure near 1.0, displacement and overturning structure is relatively large, resulting in varying degrees of damage to the structure. This paper’s research can provide theoretical and designable reference for similar engineering structures.
Źródło:
Polish Maritime Research; 2016, S 1; 109-114
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of geotextile reinforcement on shear strength of sandy soil: laboratory study
Autorzy:
Denine, S.
Della, N.
Muhammed, R. D.
Feia, S.
Canou, J.
Dupla, J.-C.
Powiązania:
https://bibliotekanauki.pl/articles/178921.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sand
behaviour
geotextile
undrained
confining pressure
excess pore pressure
strength ratio
Opis:
This paper presents results of a series of undrained monotonic compression tests on loose sand reinforced with geotextile mainly to study the effect of confining stress on the mechanical behaviour of geotextile reinforced sand. The triaxial tests were performed on reconstituted specimens of dry natural sand prepared at loose relative density (Dr = 30%) with and without geotextile layers and consolidated to three levels of confining pressures 50, 100 and 200 kPa, where different numbers and different arrangements of reinforcement layers were placed at different heights of the specimens (0, 1 and 2 layers). The behaviour of test specimens was presented and discussed. Test results showed that geotextile inclusion improves the mechanical behaviour of sand, a significant increase in the shear strength and cohesion value is obtained by adding up layers of reinforcement. Also, the results indicate that the strength ratio is more pronounced for samples which were subjected to low value of confining pressure. The obtained results reveal that high value of confining pressure can restrict the sand shear dilatancy and the more effect of reinforcement efficiently.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 4; 3-13
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pore-Pressure Generation and Liquefaction of Granular Soil Tested in Triaxial Conditions
Autorzy:
Mierczyński, J.
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/241325.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
cyclic loadings
granular soils
triaxial conditions
pore-pressure generation
liquefaction
Opis:
The paper deals with modelling of pore-pressure generation in saturated sand subjected to triaxial cyclic loading in undrained conditions. The model proposed links the pore-pressure generation with the cyclic loading induced compaction of the same sand, but tested in fully drained conditions. The governing equation for the pore-pressure changes is derived from the assumption that no volumetric strain develops in saturated sand in undrained conditions. The numerical solutions are compared with experimental data, for a large number of loading cycles.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 3-4; 139-147
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rayleigh Waves Transformation in Liquefying Water-saturated Sands
Autorzy:
Staroszczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/241359.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Rayleigh surface wave
water-saturated sand
excess pore pressure generation
soil liquefaction
Opis:
The behaviour of a water-saturated sand deposit subjected to dynamic loads induced by the propagation of Rayleigh surface waves is analysed. Cyclic shearing of the saturated sand matrix due to ground motions results in the development of excess pore pressures in the soil and its subsequent liquefaction. The phenomena of pore pressure generation and soil liquefaction are investigated within the framework of a compaction theory for saturated granular media. The results of calculations, carried out by a finite-element method, illustrate the evolution of pore pressures and the development of liquefaction zones in the soil, and show the variation of surface wave parameters with the progressive degradation of the strength of the subsoil.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 2-3; 173-190
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
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
Tytuł:
Pore pressure profiling in Siercza landslide colluvium in the Carpathian flysch using a Cone Penetration Test (CPTU)
Autorzy:
Stanisz, Jacek
Pilecki, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/2058632.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
cone penetration test
pore pressure
inclinometer displacement
landslide
colluvium
slip surface
Carpathian flysch
Opis:
This study identifies zones with significant changes in pore water pressure influenced by landslide processes. Measurements were taken in the near-surface strata of the Carpathian flysch, in colluvium of the Siercza landslide, near Kraków. Measurement of pore water pressure in flysch deposits is complicated due to the strongly heterogeneous properties of the medium and by variable water conditions, which are strongly influenced by rainfall intensity. Pore pressure profiling was performed in six series using a cone penetration test with a NOVA Acoustic cone. The tests were carried out in the colluvium to a depth of ~6.0 m under varying water conditions. The cone pore pressure results were compared to results of inclinometer measurements in the research area. Five zones with significant differences in pore pressure have been identified. Changes in both cone pore pressure and inclinometer displacement are evident at a depth range from 1.5 to 2.5 m. Two slip surfaces are likely present in this section. Such information can be used in engineering practice for more reliable assessment of slope stability in the Carpathian flysch.
Źródło:
Geological Quarterly; 2019, 63, 4; 839--848
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Results of Measurements of Pore Water and Air Pressure in Model Studies on an Flood Embankment Under Variable Water Saturation Conditions
Wyniki pomiarów ciśnień w badaniach modelowych wału przeciwpowodziowego w zmiennych warunkach nawodnienia
Autorzy:
Bogacz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1811650.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
flood embankment
pore pressure
variable water saturation
wał przeciwpowodziowy
ciśnienie porowe
zmienne warunki nawodnienia
Opis:
This paper contains results of measurements of the pore water pressures in a model flood embankment exposed to different water saturation levels. The pressure of air and water was measured, and the recorded values were referred to the atmospheric pressure value. Correlation of the variables corresponding to the recorded pressures was observed, with the appearance of discontinuous in the soil structure of the model.
W pracy przedstawiono wyniki pomiarów wartości ciśnień porowych w modelu wału przeciwpowodziowego w zmiennych warunkach nawodnienia. Dokonano pomiaru ciśnień powietrza i wody, a zarejestrowane wartości odniesiono do wartości ciśnienia atmosferycznego. Zaobserwowano zbieżność zmienności zarejestrowanych wartości ciśnień z powstawaniem nieciągłości w strukturze gruntowej modelu.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 2; 959-967
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of consolidation settlement and creep deformation of artificial island revetment structure in a large-scale marine reclamation land project
Autorzy:
Zhao, J.
Zhou, T.
Wang, G.
Powiązania:
https://bibliotekanauki.pl/articles/258848.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine reclamation land
Soft-Soil-Creep model
consolidation settlement
pore pressure
micro-structure
numerical analysis
Opis:
In order to analyze the influential factors of soft foundation settlement in a marine reclamation land project, the consolidation settlement and pore pressure dissipation of the entire area are numerically simulated using Soft-SoilCreep Model, in which the PLAXIS finite element software for professional geotechnical engineering is applied and empirical data of Japanese Kansai’s airport project are used. Moreover, the figures of settlement and pore pressure results in the different basic period are drawn, and the corresponding analysis conclusions are obtained based on the comparison among the results from the computational parameters of depth. In addition,, the influence rules of various parameters on settlement results is concluded through running the parameter sensitivity analysis in Soft-Soil-Creep Model, and the experience and conclusions can be for reference in the design and con-struction of similar large-scale marine reclamation land project. Also the empirical value method of the creep index has not been applied widely. Further research needs to be done.
Źródło:
Polish Maritime Research; 2015, S 1; 35-42
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groundwater flow due to a nonlinear wave set-up on a permeable beach
Autorzy:
Przyborska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47606.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
pore pressure
groundwater circulation
nonlinear wave
water flow
beach sand
shallow water
wave dynamics
coastal zone
Źródło:
Oceanologia; 2014, 56, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł

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