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Wyświetlanie 1-15 z 112
Tytuł:
Settlement Analysis of a Sandy Clay Soil Reinforced with Stone Columns
Autorzy:
Boru, Yada Tesfaye
Negesa, Adamu Beyene
Scaringi, Gianvito
Puła, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2172889.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stone column
sandy clay soil
excavation replacement method
settlement
hardening soil model
Opis:
Mat foundations are most typically used in locations featuring weak soils such as soft clays and silts, particularly when building in demanding geotechnical conditions. Because of their poor engineering characteristics and significant difficulties associated with workability, these soils are often removed or avoided by excavating down to a specific depth. However, if thick layers are present, their removal becomes unpractical, costly, and creates inconvenience during construction. To overcome this issue, various reinforcement strategies can be adopted. In this study, the use of stone columns under mat foundations was investigated via numerical modeling. Two scenarios were compared: one in which stone columns were installed without any soil removal and another in which a layer of soft ground was removed and the foundation was installed without any ground treatment. Numerical results showed the clear beneficial effect of stone columns, which can significantly reduce settlements even in the presence of a thick deformable soil layer.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 333--342
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Parameterization of Some physical processes in Soils on Numerical meteorological Forecasts of Surface Fields
Autorzy:
Mazur, Andrzej
Duniec, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2134727.pdf
Data publikacji:
2017-02-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Soil-plant-water system
Hydrodynamics of porous media
parameterization schemes
multilayer soil model
Numerical weather prediction
Opis:
physical processes in soil-plant-water system are very complicated. Complex physical processes in soil, in particular interaction between soilplant-water system have signicfiant inuflence on processes in planetary Boundary layer. Changes of soil state can signicfiantly modify processes in the pBl and meteorological efilds . Since numerical models are to determine the forecast of high quality, the physical processes occurring in soil should be properly described and then appropriately introduced into a model. every process in soil occurs on a smaller scale than original model's domain, so it should be described via adequate parameterization. Overall, soil parameterizations implemented in current numerical weather prediction (NWp) model(s) were prepared almost 40 years ago, when NWp models worked with very poor resolution mesh. Since nowadays NWp works over domains of high resolution, these “old” schemes parameterization must be adequately revised. In this paper preliminary results of changes of parameterization of soil processes will be presented.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2016, 20, 4; 48-58
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric study of deep excavation in clays
Autorzy:
Mitew-Czajewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/200380.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical analysis
constitutive models
hypoplasticity
hardening soil model
analiza numeryczna
modele konstytutywne
hypoplastyczność
utwardzanie gleby
model gleby
Opis:
The most challenging issue when analyzing geotechnical structures by means of finite element method is the choice of appropriate constitutive soil model, especially with reference to serviceability limit states. The paper presents parametric study of a deep excavation in clays aiming to qualify the applicability of different soil constitutive models in such specific soil conditions. Three types of constitutive models are considered in the paper: linear elastic – perfectly plastic model (Mohr-Coulomb) as a simple and well recognized reference, hypoplastic model (Hypoplastic Clay) and nonlinear elasto-plastic cap models (Hardening Soil and Hardening Soil Small). Numerical analysis was performed using two finite element codes – Plaxis and GEO5 FEM both in 2D space and the results were compared to in-situ displacements measurements. The discussion on the suitability of chosen constitutive models for advanced modelling of deep excavation in preconsolidated clays is presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 747-754
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics coefficient for two-phase soil model
Autorzy:
Wrana, B.
Powiązania:
https://bibliotekanauki.pl/articles/178585.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dynamic consolidation
Biot theory
dynamics
two-phase soil model
teoria Biota
dynamika
dwufazowy model gleby
konsolidacja dynamiczna
Opis:
The paper investigates a description of energy dissipation within saturated soils-diffusion of pore-water. Soils are assumed to be two-phase poro-elastic materials, the grain skeleton of which exhibits no irreversible behavior or structural hysteretic damping. Description of motion and deformation of soil is introduced as a system of equations consisting of governing dynamic consolidation equations based on Biot theory. Selected constitutive and kinematic relations for small strains and rotation are used. This paper derives a closed form of analytical solution that characterizes the energy dissipation during steady-state vibrations of nearly and fully saturated poro-elastic columns. Moreover, the paper examines the influence of various physical factors on the fundamental period, maximum amplitude and the fraction of critical damping of the Biot column. Also the so-called dynamic coefficient which shows amplification or attenuation of dynamic response is considered.
Źródło:
Studia Geotechnica et Mechanica; 2014, 36, 2; 51-56
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two scales, hybrid model for soils, involving artificial neural network and finite element procedure
Autorzy:
Krasiński, M.
Lefik, M.
Powiązania:
https://bibliotekanauki.pl/articles/178935.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soil model
neural network
finite element method
hybrid FE-ANN model
model gleby
sieci neuronowe
metoda elementów skończonych
model hybrydowy FE-ANN
Opis:
A hybrid ANN-FE solution is presented as a result of two level analysis of soils: a level of a laboratory sample and a level of engineering geotechnical problem. Engineering properties of soils (sands) are represented directly in the form of ANN (this is in contrast with our former paper where ANN approximated constitutive relationships). Initially the ANN is trained with Duncan formula (Duncan and Chang [2]), then it is re-trained (calibrated) with some available experimental data, specific for the soil considered. The obtained approximation of the constitutive parameters is used directly in finite element method at the level of a single element at the scale of the laboratory sample to check the correct representation of the laboratory test. Then, the finite element that was successfully tested at the level of laboratory sample is used at the macro level to solve engineering problems involving the soil for which it was calibrated
Źródło:
Studia Geotechnica et Mechanica; 2014, 36, 2; 29-36
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impacts of soil structure on crop growth
Autorzy:
Rajkai, K.
Vegh, K.R.
Varallyay, G.
Farkas, C.S.
Powiązania:
https://bibliotekanauki.pl/articles/25063.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
bulk density
soil structure
soil water
heat flow
crop growth
hydrophysical property
water conductivity
SOIL model
vegetation period
root distribution
water retention
Źródło:
International Agrophysics; 1997, 11, 1-2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Hypoplastic Clay model for deep excavation modelling
Ocena modelu Hypoplastic Clay do modelowania głębokich wykopów
Autorzy:
Mitew-Czajewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/230387.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wykop głęboki
strefa wpływu
modelowanie
metoda elementów skończonych
model gruntu
model hypoplastyczny
deep excavation
influence zone
modelling
finite element method
soil model
hypoplastic model
Opis:
This paper presents an evaluation of the Hypoplastic Clay constitutive model for finite element analysis of deep excavations and displacements induced by excavations in the influence zone. A detailed description and formulation of the Hypoplastic Clay soil model is included. A parametric case study of a deep excavation executed in Pliocene clays is presented. FE analysis was performed using several soil models (Mohr-Coulomb, Modified Mohr-Coulomb, Drucker-Prager, Modified Cam-Clay, Hypoplastic Clay) and the results were compared to in-situ displacements measurements taken during construction. Final conclusions concerning the suitability of the Hypoplastic Clay model for deep excavation modelling in terms of accurate determination of horizontal displacements of the excavation wall, the uplift of the bottom of excavation, and, most importantly,vertical displacements of the terrain in the vicinity of the excavation are presented.
W artykule przedstawiono ocenę modelu konstytutywnego stanu krytycznego Hypoplastic Clay (Ił hypoplastyczny) do analizy metodą elementów skończonych głębokich wykopów i oceny przemieszczeń w strefie ich wpływu. W pracy zawarto również szczegółowy opis i sformułowanie modelu Hypoplastic Clay. Zaprezentowano parametryczne studium przypadku dotyczące głębokiego wykopu wykonanego w Warszawie, w iłach plioceńskich formacji poznańskiej. Analizowany obiekt to wykop stacji metra o wymiarach 20x150m i głębokości 14.6m wykonywany metodą odkrywkową z zastosowaniem dwóch rzędów kotew iniekcyjnych i jednego poziomu rozpór stalowych jako rozparcia. Analizę modelu przeprowadzono z zastosowaniem metody elementów skończonych, programem GEO5 MES, z uwzględnieniem kilku modeli materiałowych gruntu (Mohr-Coulomb, Modified Mohr-Coulomb, Drucker-Prager, Modified Cam-Clay, Hypoplastic Clay), a wyniki porównano z geodezyjnymi pomiarami przemieszczeń in-situ wykonanymi w trakcie budowy.
Źródło:
Archives of Civil Engineering; 2016, 62, 4/I; 73-86
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty badania długoterminowych cykli zmian zapasu wody glebowej w drzewostanach jednogeneracyjnych
Selected aspects of the study of long-term cycles of changes in the soil water storage in single generation stands
Autorzy:
Suliński, J.
Starzak, R.
Powiązania:
https://bibliotekanauki.pl/articles/979483.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany jednopokoleniowe
woda glebowa
zapas wody w gruncie
zmiany zapasu wody glebowej
forest water balance
forest soil water storage
water balance equation
atmosphere−forest−soil model
Opis:
This article describes cyclic changes in the soil water storage that take place within developmental stages of the stands managed by clear−cutting system. The aim of the paper is to present possibilities of studying these changes and their significance for the dynamics of waterlogging of forest ecosystems and water outflow from the forest. Soil water storage (SWS) in forest soils undergoes cyclic changes that can be divided into short−term, seasonal and long−term. Short−term changes, calculated on a daily basis, and seasonal, covering the entire growing season, can be identified and analyzed based on stock values measured over relatively short periods. Studying long−term cycles in this way is practically impossible, as there are no long−term measuring sequences. However, it is possible to use water−balance equilibrium in atmosphere−stand−soil (A−D−G) for this purpose. The dependent variables include increments of soil water storage, while independent ones are represented by the biometric features of stands and hydro−climatic factors. The balance equations should be built separately for SWS supply and losses. In the recharge phase the increase of the SWS after single rainfall, the amount of potential interception proportional to the plant surface and the weight of the forest litter as well as rainfall intensity and duration, which determine the level of its use are taken into account. SWS losses are explained by the rates of plant transpiration, linearly dependent on the amount of biomass produced and evaporation from the soil surface, which is a function of the amount of solar energy and wind velocity within the stand. They are modulated in relation to the conditions above the canopy that in turn depend on biometric characteristics of the stand. Taking into account the hydro−climatic conditions above the canopy ensures that the ceteris paribus condition is met. Recognition of long−term SWS cycles is possible due to the knowledge of stand dynamics manifested by changes in the value of its biometric features. The identification of equations according to the above−mentioned indications was carried out many times with very high compliance in the conditions of even−aged low−energy stands. The occurrence of long−term SWS cycles raises a number of questions regarding the forest ecosystem functioning, description of forest sites, silvicultural systems applied as well as the ability to control the water balance in forest ecosystems. The hydrological conditions in the forest ecosystem are shaped mostly upon selecting silvicultural system to be implemented. It results in specific changes in biometric features in the subsequent stand development stages modulating the components of the A−D−G balance and, as a consequence, soil water relations. The impact of ongoing stand tending is limited. However, forest drainage, tree felling uncovering soil surface and sudden changes in the forest structure triggered by abiotic and biotic factors, may produce significant effects.
Źródło:
Sylwan; 2019, 163, 03; 216-227
0039-7660
Pojawia się w:
Sylwan
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:
Predicting the soil water retention curve from readily - available data obtained during soil surveys
Autorzy:
Simota, C.
Mayr, T.
Powiązania:
https://bibliotekanauki.pl/articles/25103.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
retention
ACCESS model
soil water
soil survey
Źródło:
International Agrophysics; 1996, 10, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Chosen Methods for Determination of the USLE Soil Erodibility Factor on the Example of Loess Slope
Autorzy:
Kruk, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/1839571.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil erodibility factor
model USLE
Opis:
The investigations were carried out on a loess slope in the Brzeźnica village, in the Rudnik commune. Nine points were chosen, in which particular parameters being parts of the examined models, were determined. On the basis of the literature, eight models for the Universal Soil Loss Equation (USLE) erodibility factor determination were designated. The chosen models were the ones proposed by: Wishmeier, Monchareonm, Torii et al. and Walker (all based on texture and organic matter content, Wischmeier and Smith (based on texture organic matter content and additionally on aggregate classes), Wiliams et al. (based on texture and organic carbon content), Renard et al. as well as Stone and Hilborn (both based only on texture). The investigated site was characterized as well. The statistical conclusions were drawn and the obtained results were compared with the results presented in the literature.
Źródło:
Journal of Ecological Engineering; 2021, 22, 1; 151-161
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The access project: agro-climatic change and European soil suitability - a spatially distributed soil, agro-climatic and soil hydrological model
Autorzy:
Loveland, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/24798.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil hydrology
soil erosion
soil
land
hydrological model
soil suitability
Europe
climate change
Źródło:
International Agrophysics; 1996, 10, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of correlation models for the estimation of the water retention characteristics of soil
Autorzy:
Walczak, R.
Witkowska-Walczak, B.
Slawinski, C.
Powiązania:
https://bibliotekanauki.pl/articles/24572.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
correlation model
soil water content
soil
soil water potential
water retention
estimation
Źródło:
International Agrophysics; 2002, 16, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model of oscillations of trailed agricultural machines moving along the irregularities of soil
Autorzy:
Bulgakov, V.
Ivanovs, S.
Powiązania:
https://bibliotekanauki.pl/articles/336181.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
model matematyczny
maszyny rolnicze
gleba
mathematical model
soil
agricultural machines
Opis:
Oscillatory movements of trailed agricultural machines have been studied theoretically and analysed in the process of their movement along the surface irregularities of soil. On the basis of differential equations of the movement of a mechanical system in a longitudinal vertical plane (using the Lagrange equations of the 2nd kind) a mathematical model of the oscillatory movement of a trailed agricultural machine aggregate due to the soil irregularities has been developed.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2010, 55, 3; 33-36
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of inertia forces on soil settlement under harmonic loading
Autorzy:
Wrana, B.
Pietrzak, N.
Powiązania:
https://bibliotekanauki.pl/articles/178311.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
model Biota
dynamika gruntów
ośrodek porowaty
osiadanie gruntu
porous solid
soils
soil dynamic
soil settlement
Biot model
Opis:
The paper deals with the comparison of Biot’s model for saturated, porous soils with other simplified models used in dynamic analysis. The purpose of this paper is to determine some limits of validity of the various models. In order to do this a full set of governing, dynamic equations of Biot model and a series of simplifying models such as u-p simplification and quasi-static consolidation models are considered. These formulations are applied to a simple soil layer under periodic surface loading. A displacement of skeleton and a displacement of fluid are shown and compared with each model for various formulations.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 1; 245-258
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 112

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