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Calibration of characteristic values of soil properties using the random finite element method

Zaskórski Ł., Puła W.

Archives of Civil and Mechanical Engineering

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2016

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Vol. 16, no. 1

112--124

EN

In this paper the reliability assessment of the shallow strip footing was conducted using a reliability index β. Therefore some approaches of evaluation of characteristic values of soil properties were compared in order to check what reliability index β can be achieved by applying each of them. For this purpose, design values of the bearing capacity based on these approaches were referred to design values of the bearing capacity estimated by the random finite element method. Design values of the bearing capacity were estimated for various widths and depths of foundation in conjunction with design approaches defined in Eurocode 7. The cohesive soil was considered – clay from the area of Wrocław. The characteristic values of shear strength parameters were evaluated basing on the effective values of soil parameters.

2

On some methods in safety evaluation in geotechnics

Puła W., Zaskórski Ł.

Studia Geotechnica et Mechanica

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2015

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Vol. 37, nr 2

17--32

EN

The paper demonstrates how the reliability methods can be utilised in order to evaluate safety in geotechnics. Special attention is paid to the so-called reliability based design that can play a useful and complementary role to Eurocode 7. In the first part, a brief review of first- and second-order reliability methods is given. Next, two examples of reliability-based design are demonstrated. The first one is focussed on bearing capacity calculation and is dedicated to comparison with EC7 requirements. The second one analyses a rigid pile subjected to lateral load and is oriented towards working stress design method. In the second part, applications of random field to safety evaluations in geotechnics are addressed. After a short review of the theory a Random Finite Element algorithm to reliability based design of shallow strip foundation is given. Finally, two illustrative examples for cohesive and cohesionless soils are demonstrated.

3

Oszacowanie miar bezpieczeństwa posadowienia bezpośredniego z zastosowaniem metody losowych elementów skończonych

Zaskórski Ł., Puła W.

Inżynieria Morska i Geotechnika

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2015

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nr 3

342--350

PL

Obliczanie nośności podłoża pod fundamentem bezpośrednim z uwzględnieniem przestrzennej zmienności parametrów gruntu. Wykorzystanie metody losowych elementów skończonych do oceny bezpieczeństwa fundamentu. Porównanie różnych metod wyznaczania wartości charakterystycznych parametrów gruntu – metoda Duncana, podejście uproszczone Schneidera, podejście Schneidera uwzględniające wpływ skal fluktuacji, metoda Orr’a i Breysse, metoda oparta na 5% kwantylu (metoda zawarta w Eurokodzie 7). Przeprowadzenie oceny bezpieczeństwa ławy fundamentowej z wykorzystaniem wskaźnika niezawodności β w świetle obowiązujących przepisów (Eurokody).

EN

Evaluation of the bearing capacity of the shallow foundation considering spatial variability of soil parameters. Employment of the random finite element method to safety assessment of the foundation. Comparison of various methods of estimation of characteristic values of soil parameters – Duncan’s method, simplified approach of Schneider, Schneider’s method considering influence of fluctuation scales, method of Orr and Breysse, approach based on 5% quantile (method included in Eurocode 7). Safety assessment of strip footing applying reliability index b in the light of the applicable standards (Eurocodes).