Wyniki wyszukiwania - BazTech

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Ocena podatności gruntu sypkiego na upłynnienie w warunkach trójosiowego ściskania pod wpływem małych naprężeń

Mierczyński Jacek, Smyczyński Marcin, Kazimierowicz-Frankowska Krystyna

Inżynieria i Budownictwo

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2023

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R. 79, nr 5-6

272--275

PL

Przedstawiono wyniki badań w aparacie trójosiowego ściskania wykonanych na próbkach nawodnionego gruntu niespoistego w warunkach bez odpływu wody z porów. Badano reakcję gruntu na obciążenie cykliczne w zakresie małych naprężeń. Wykonanie tych badań wymagało opracowania opisanej w artykule autorskiej procedury rozszerzającej możliwości pomiarowe standardowego aparatu trójosiowego. Poprawność jej działania zweryfikowano w trakcie wykonanych eksperymentów, określając liczbę cykli obciążeń niezbędnych do upłynnienia próbek gruntu.

EN

The results of tests in the triaxial apparatus performed on samples of non-cohesive soil in undrained conditions are presented. The response of soil to cyclic loading at low stress levels was studied. Performing these tests required the development of a bespoke procedure extending the measurement capabilities of a standard triaxial apparatus, which is described in the article. Its correctness was verified during the experiments, while determining the number of load cycles necessary to liquefy the soil samples.

2

Deformations and stability of granular soils: Classical triaxial tests and numerical results from an incremental model

Sławińska-Budzich Justyna, Mierczyński Jacek

Studia Geotechnica et Mechanica

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2020

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Vol. 42, nr 2

137--150

EN

This article presents a modified incremental model describing pre-failure deformations of granular soils under classical triaxial conditions. The original shape of equations has been proposed by Sawicki and Świdziński [40, 41]. A new form of equations that are consistent with the proposed definitions of deviatoric loading and unloading is suggested. Triaxial tests necessary for calibrating the proposed model have been performed. The modified model is used to simulate the deformations and stability of sand for every pre-failure loading path and makes it possible to describe the behaviour of granular soil under both drained and undrained conditions. A comparison of experimental and numerical results is presented. All investigations were performed in a classical tri-axial apparatus.

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Distinct Element Simulation of a Landslide Process

Zabuski Lesław, Mierczyński Jacek

Archives of Hydro-Engineering and Environmental Mechanics

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2020

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Vol. 67, nr 1-4

3--16

EN

The paper presents a numerical simulation of the development of a catastrophic landslide in a sandstone quarry and methods of reconstructing the quarry to its previous condition from before the landslide. The important objective of the paper is to present the capabilities of the numerical method used in the analysis of the landslide process, namely the Distinct Element Method (DEM). This method is poorly known, though it is capable of solving important geotechnical problems in which massive displacements are modelled. The features of the method are presented on the basis of a case study. Therefore a numerical analysis is carried out to show the performance of DEM in generating a displacement of several dozen meters in the example of a catastrophic landslide that occurred some years ago in a sandstone quarry. This engineering problem makes it possible to describe and analyse the mechanisms, causes and consequences of the landslide.