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1
Content available Effect of settlement of foundations on the failure risk of the bottom of cylindrical steel vertical tanks for liquids
Hotala Eugeniusz, Ignatowicz Rajmund
Studia Geotechnica et Mechanica
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2019
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Vol. 41, nr 3
171--176
EN
Different types of foundations are used in steel, above-ground cylindrical storage tanks for liquids. If a sand-gravel foundation is used under the entire bottom of the tank or only in the central part of the tank, settlement can be expected, and it increases after many years of operation. The paper presents the typical kinds and types of soil settlements under the bottoms of the tanks, in which different types of foundations were used. Numerical analyses of the effect of the soil settlement on the state of deformations and stresses in steel sheets of the bottom under one of the real tanks, in which different types of foundations and different cases of settlement were assumed. The results of numerical analyses indicated the possibility of evaluating the state of the soil settlement and bottom sheet deformations on the basis of simple measurements of deformations of the lower part of the tank cylinder. These measurements can be very useful in assessing the possible risk of failure of the tank bottom during each period of its operation, as measurements of settlement of the bottom of a filled tank are not feasible in practice. It has been proposed that in each steel tank, the deformation of the cylinder’s sheets should be measured even before the beginning of exploitation, and that in subsequent periodical measurements, the influence of the soil settlement under the tank on the state of the cylinder deformation and bottom’s strain should be assessed more accurately.
2
Content available Simplified Probabilistic Analysis of Settlement of Cyclically Loaded Soil Stratum by Point Estimate Method
Przewłócki J., Górski J., Świdziński W.
Archives of Hydro-Engineering and Environmental Mechanics
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2016
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Vol. 63, nr 2-3
121--133
EN
The paper deals with the probabilistic analysis of the settlement of a non-cohesive soil layer subjected to cyclic loading. Originally, the settlement assessment is based on a deterministic compaction model, which requires integration of a set of differential equations. However, with the use of the Bessel functions, the settlement of a soil stratum can be calculated by a simplified algorithm. The compaction model parameters were determined for soil samples taken from subsoil near the Izmit Bay, Turkey. The computations were performed for various sets of random variables. The point estimate method was applied, and the results were verified by the Monte Carlo method. The outcome leads to a conclusion that can be useful in the prediction of soil settlement under seismic loading.
3
Content available Influence of inertia forces on soil settlement under harmonic loading
Wrana B., Pietrzak N.
Studia Geotechnica et Mechanica
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2013
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Vol. 35, nr 1
245--258
EN
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.
4
Most graniczny na Nysie Łużyckiej - przykład budowy mostu na gruntach o małej nośności i dużej podatności
Madaj A., Kozłowski J., Stachowski Z.
Mosty
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2013
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nr 6
30--36
PL
W artykule autorzy przedstawiają przykład mostu, w którym ze względu na warunki gruntowe zastosowano system statyczny, nie generujący dodatkowych sił przy nierównomiernych osiadaniach, jakim jest belka ciągła z przegubami, tzw. belka gerberowska. Istotnym elementem projektu mostu był projekt technologii budowy, pozwalający na zminimalizowanie negatywnych skutków nierównomiernego osiadania w czasie budowy.
EN
The article presents an example of a bridge in which, due to the ground conditions, a static system that does not generate additional forces during uneven subsidence has been applied – continuous beam with joints, the so called Gerber’s beam. A crucial element of the bridge was the design of its construction technology allowing for the minimizing of the negative impact of uneven subsidence during the construction.
5
Content available remote Analiza modeli osiadania gruntu organicznego
Meyer Z., Bednarek R.
Inżynieria Morska i Geotechnika
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2008
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nr 3
136-139
PL
Ogólna charakterystyka pięciu modeli empirycznych opisujących przebieg uziarnienia gruntów organicznych. Porównanie osiadania pomierzonego i obliczonego. Propozycja empirycznego modelu konsolidacji torfów.
EN
General characteristics of five empirical models describing the settlements of organic soils. Comparison of calculated and measured settlements. Proposal of empirical model for consolidation of peat.
6
Stała czasowa w empirycznym modelu osiadania gruntu organicznego
Meyer Z., Bednarek R.
Zeszyty Naukowe. Budownictwo / Politechnika Śląska
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2003
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z. 97
109-117
PL
W pracy został przedstawiony empiryczny model osiadania gruntu organicznego. Na podstawie prowadzonych badań osiadania gruntu organicznego w laboratorium, w edometrze do opisu zjawiska została opracowana krzywa elementarna. Parametry krzywej elementarnej p, D, [alfa] są funkcją obciążenia, właściwości fizycznych i mechanicznych badanego gruntu. Tematem pracy jest skala czasu, która jest kluczowym parametrem opisującym zachowanie się gruntu organicznego pod obciążeniem, różnicującym rodzaj badanego gruntu.
EN
The paper presents empirical model of organic soils settlement in laboratory tests. Settlement is described by means of elementary curve. Parameters p, D, [alfa] of elementary curve are functions of load, and physical and mechanical properties of soil. Authors define the time scale of the model settlement. This scale allows to introduce dimensionless parameters which control the phenomenon. The time scale is a subject of verification against measured parameters of the analysed settlement. To describe this phenomenon the time scale has essential meaning. The coefficient of kinematic viscosity is adopted to the time-constant.
7
Content available remote Osiowo-symetryczny stan odkształcenia konsolidującej anizotropowej półprzestrzeni gruntowej wywołany źródłem ciśnienia
Łach K.
Przegląd Naukowy Inżynieria i Kształtowanie Środowiska
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2001
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Vol. 10, No. 1
167--174
EN
In our paper we estimated strain state in anisotropic, consolidating halfspace, caused by the sources of pressures in liquid. We found the solution using the techniques of integral transformations obtaining analytical dependencies of soil settlement on intensities of the source acting and the parameters characterising anisotropy. We illustrated the obtained results with an example and a plot of settlement caused by the source of pressure.
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