Wyniki wyszukiwania - BazTech

1

Podstawowe zasady i nowe możliwości wykorzystywania wyników badań presjometrycznych

Tarnawski M.

Przegląd Geologiczny

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2017

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Vol. 65, nr 10/2

725--736

EN

This article is an attempt to briefly summarize the achievements of the pressuremeter research methodology and its development paths in over sixty years of its existence. The current rules for the tests execution and interpretation of their results as well as their application in the foundation design and in geological-engineering evaluation of the sites are discussed and subjected to critical analysis. Attention has been drawn to the unique ability to identify and estimate errors that may occur during testing, and the last chapter outlines the prospects for the development of this research technique. The author has also presented his accomplishments, such as the introduction of the concept of maximum and minimum settlement, a new way for determining the creep pressure, and a simplified way of defining the so-called standard settlement. In conclusion, the author has drawn attention to the numerous advantages of the pressuremeter method. These include, in particular, a direct assessment of the two most important characteristics of the soil: strength (bearing capacity) and compressibility, reduction of scale effect and the ability to test the soil at any depth.

2

Charakterystyka właściwości mechanicznych iłów zastoiskowych z okolic Radzymina na podstawie badań presjometrycznych

Zawrzykraj P., Kiełbasiński K.

Biuletyn Państwowego Instytutu Geologicznego

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2011

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nr 446 (2)

429--435

PL

Omówiono wyniki badań geologiczno-inżynierskich iłów zastoiskowych z rejonu Radzymina. Parametry mechaniczne otrzymano w toku badań wykonanych w warunkach in situ przy użyciu presjometru Menarda. Do testów zastosowano najnowszy model firmy Apageo wyposażony w elektroniczny system rejestracji GeoSPAD. Otrzymane dane zestawiono i porównano z wynikami z sondy statycznej CPT oraz dylatometru Marchettiego DTM. Przy zastosowaniu wspomnianej aparatury dokonano oceny modułu ściśliwości, naprężenia pełzania, naprężenia granicznego, współczynnika parcia gruntu w spoczynku i in. Zwrócono uwagę na rozbieżności w uzyskanych wartościach w zależności od metodyki badań. W artykule przedstawiono także sytuację geologiczną iłów zastoiskowych występujących w badanym rejonie.

EN

The paper presents the results of engineering-geological studies of ice-dammed clays from Radzymin area in Poland. The mechanical parameters were obtained from the in situ tests performed with Menard pressuremeter. Tests were carried out using up to date control-test unit GeoSPAD. The results were set and compared with those from static test (CPT) and dilatometer test (DMT). Pressuremeter modulus, creep pressure, limit pressure and coefficient of earth pressure at rest and others parameters were evaluated. The differences between the results obtained from selected method were noticed: Geological conditions of ice-dammed clays in study area were also presented in the paper.

3

Imperfect spherical cap with stiffening ring subjected to external pressure

Stredova D., Tomek P., Pascenko P.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

483-490

EN

The aim of this paper is to perform a detail numerical analysis of both perfect and imperfect spherical caps subjected to an external pressure. The problem is limited to a case of the simply supported imperfect spherical cap stiffened with the circumferential ring at its edge. Both the central and lateral initial imperfection is considered. The main task is to find the reduction factor depending on the thickness parameter R/t. In addition to a theoretical description of this special stability problem, the results serve for a preparation of future experiments with real steel specimens. The finite element geometrically nonlinear computational analyses are performed by means of the computer program COSMOS/M.

4

Numerical analysis for an interpretation of the pressuremeter test in cohesive soil

Monnet J.

Studia Geotechnica et Mechanica

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2008

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Vol. 30, nr 1-2

41-49

EN

We present the theory used for the interpretation of the pressuremeter test in cohesive soil and its extension to the conventional limit pressure, which is defined as the pressure at the borehole wall for a volume increase ?V equal to the initial volume of the borehole. This conventional limit pressure can be directly measured with the pressuremeter, whereas the determination of the theoretical limit pressure needs its extrapolation to an infinite expansion and cannot be directly measured. The validation of this theory is made by the finite element method with the results of the Tresca standard model of Plaxis, which is compared with the theoretical expression. Some conclusions are drawn on the validity of this new theory which allows the measurement and the control of shearing modulus and shear strength of the natural soil.