Temat: soil liquefaction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Love wave-induced liquefaction in a saturated sand layer
Upłynnienie gruntu w warstwie nawodnionego piasku wywołane propagacją fal Lovea
Autorzy:: Staroszczyk, R.
Powiązania:: https://bibliotekanauki.pl/articles/281352.pdf
Data publikacji:: 1998
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Love wave
saturated sand
soil liquefaction
Opis:: The paper is concerned with the plane strain problem of Love wave propagation through a water-saturated sand layer overlaying an elastic half-space. Dynamic loads, induced by the wave passage, generate irreversible strains in the soil matrix, giving rise to the development of excess pore water pressures and subsequent reduction of soil liquefaction. The process of pore pressure generation is analysed within the framework of compaction theory of saturated granular media. Results of numerical calculations, carried out by means of the finite element method, illustrate the evolution of pore pressures and the development of liquefaction in the subsoil, as well as the changes in the free surface displacements.
Praca poświęcona jest płaskiemu zagadnieniu propagacji fal Love'a w warstwie piasku nasyconego woda, znajdującej się na półprzestrzeni ośrodka sprężystego. Obciążenia dynamiczne spowodowane przejściem fali wywołują nieodwracalne odkształcenia w szkielecie gruntowym, które są przyczyną zwiększenia ciśnienia w wodzie wypełniającej pory ośrodka i tym samym zmniejszenia naprężeń efektywnych w gruncie, co w końcowym przypadku może prowadzić do upłynnienia podłoża. Proces generacji ciśnień porowych jest analizowany na bazie teorii zagęszczenia nawodnionych ośrodków granulowanych. Wyniki obliczeń numerycznych, przeprowadzonych w oparciu o metodę elementów skończonych, ilustrują ewolucję ciśnień porowych, rozwój strefy upłynnienia w podłożu oraz zmiany w czasie przemieszczeń powierzchni swobodnej warstwy.
Źródło:: Journal of Theoretical and Applied Mechanics; 1998, 3; 723-744
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

Tytuł:: Compaction/Liquefaction Properties of Some Model Sands
Autorzy:: Sawicki, A.
Mierczyński, J.
Sławińska, J.
Powiązania:: https://bibliotekanauki.pl/articles/241301.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: soil compaction
liquefaction
parameters
experimental data
Opis:: The compaction/liquefaction characteristics of two model sands are determined experimentally. One sand (Istanbul) is used in shaking table investigations, and the other (Dundee) in geotechnical centrifuge experiments. Both types of these highly sophisticated experiments are planned to be applied to test theories of seabed liquefaction. The first step of these experiments is to determine the parameters of model soils, which is the main goal of this paper.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 3-4; 121-133
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Assessment of susceptibility to liquefaction of saturated road embankment subjected to dynamic loads
Autorzy:: Borowiec, A.
Maciejewski, K.
Powiązania:: https://bibliotekanauki.pl/articles/178526.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: liquefaction susceptibility
soil dynamic
seismic lads
vibrations propagation in soil
dynamika gruntów
propagacja drgań w gruncie
Opis:: Liquefaction has always been intensely studied in parts of the world where earthquakes occur. However, the seismic activity is not the only possible cause of this phenomenon. It may in fact be triggered by some human activities, such as constructing and mining or by rail and road transport. In the paper a road embankment built across a shallow water reservoir is analyzed in terms of susceptibility to liquefaction. Two types of dynamic loadings are considered: first corresponding to an operation of a vibratory roller and second to an earthquake. In order to evaluate a susceptibility of soil to liquefaction, a factor of safety against triggering of liquefaction is used (FSTriggering). It is defined as a ratio of vertical effective stresses to the shear stresses both varying with time. For the structure considered both stresses are obtained using finite element method program, here Plaxis 2D. The plastic behavior of the cohesionless soils is modeled by means of Hardening Soil (HS) constitutive relationship, implemented in Plaxis software. As the stress tensor varies with time during dynamic excitation, the FSTriggering has to be calculated for some particular moment of time when liquefaction is most likely to occur. For the purposes of this paper it is named a critical time and established for reference point at which the pore pressures were traced in time. As a result a factor of safety distribution throughout embankment is generated. For the modeled structure, cyclic point loads (i.e., vibrating roller) present higher risk than earthquake of magnitude 5.4. Explanation why considered structure is less susceptible to earthquake than typical dam could lay in stabilizing and damping influence of water, acting here on both sides of the slope. Analogical procedure is applied to assess liquefaction susceptibility of the road embankment considered but under earthquake excitation. Only the higher water table is considered as it is the most unfavorable. Additionally the modified factor of safety is introduced, where the dynamic shear stress component is obtained at a time step when its magnitude is the highest – not necessarily at the same time step when the pore pressure reaches its peak (i.e., critical time). This procedure provides a greater margin of safety as the computed factors of safety are smaller. Method introduced in the paper presents a clear and easy way to locate liquefied zones and estimate liquefaction susceptibility of the subsoil – not only in the road embankment.
Źródło:: Studia Geotechnica et Mechanica; 2014, 36, 1; 15-22
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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