Characteristic of small-strain stiffness of fine-grained soils based on advanced laboratory tests

• Autorzy: Witowski Marcin , Godlewski Tomasz , Nepelski Krzysztof , Chyliński Filip

Identyfikatory

DOI

10.24425/ace.2023.147648

Warianty tytułu

PL

Charakterystyka sztywności gruntów drobnoziarnistych na podstawie zaawansowanych metod badań laboratoryjnych

• Języki publikacji: EN

Abstrakty

EN

The non-linearity of the modulus in the zone of small deformations has become one of the three basic concepts of modern soil mechanics, together with “effective stresses” or “critical state”. It is therefore necessary to obtain suitable parameters to describe these phenomena through the development of modern measuring equipment and new research methods. Limitations in the availability of the research area or research equipment indicate the need to create a data set, in the formula of regional assessments. The article presents a compilation of data on the deformation characteristics of soils covering about 75% of the country’s area, which are the most common subsoils for building. Descriptions, images of microstructures, and a record of mechanical parameters are presented for various age-old glacial clays and marginal clays and loesses. Emphasis is placed on parameters obtained from triaxial tests, including the determination of the shear modulus at small deformations obtained from BET measurements. In combination with the patented solution of sample strain measurement, complete deformability curves of the tested samples were obtained, indicating model reference curves developed for the above soil types. The statistically significant amount of data collected allowed the creation of a specific portfolio for selected soils as a starting point for assessing deformability. This corresponds to the current expectations regarding the characteristics of the behaviour of the substrate in the full spectrum of stresses and deformations, obtained from different types of tests, which, as in the case of soil stiffness degradation, together allow the correct determination of the necessary parameters.

PL

Nieliniowość modułu w strefie małych odkształceń stała się jednym z trzech podstawowych pojęć we współczesnej mechanice gruntów, podobnie jak „naprężenia efektywne” czy „stan krytyczny”. Tym samym konieczne jest pozyskiwanie odpowiednich parametrów do opisu tych zjawisk poprzez rozwój nowoczesnej aparatury pomiarowej i nowych metod badawczych. Ograniczenia w dostępności terenu badań czy aparatury badawczej wskazują na potrzebę tworzenia zbioru danych, w formule zestawień o charakterze regionalnym. W artykule przedstawiono kompilację danych w zakresie charakterystyki odkształceniowej dla gruntów zajmujących ok. 75% powierzchni kraju, stanowiących najczęstsze podłoże obiektów budowlanych. Przedstawiono opisy, obrazy mikrostruktur oraz zapis parametrów mechanicznych dla różnowiekowych glin polodowcowych i iłów zastoiskowych oraz lessów. Główny nacisk został położony na parametry uzyskane z badań „trójosiowych”, w tym oznaczenia modułu ścinania przy małych odkształceniach uzyskane z pomiarów sejsmicznych metodą BET. W połączeniu z opatentowanym rozwiązaniem napróbkowego pomiaru odkształceń uzyskano pełne przebiegi odkształcalności badanych próbek wskazując modelowe krzywe referencyjne opracowane dla ww. typów gruntów. Istotna statystycznie ilość zebranych danych pozwoliła na stworzenie swoistego portfolio dla wybranych gruntów, jako punkt wyjścia do oceny zdolności deformacyjnych. Spełnia to obecne oczekiwania odnośnie charakterystyk zachowania podłoża w pełnym spektrum naprężeń i odkształceń, uzyskiwanych z różnego typu badań, które tak jak w przypadku degradacji sztywności gruntu zebrane razem pozwalają na poprawne wyznaczenie niezbędnych parametrów.

Słowa kluczowe

EN

deformation test; degradation curve; fine grained soil; loess; microstructure; soil stiffness

PL

badanie odkształcalności; grunt drobnoziarnisty; krzywa degradacji; sztywność gruntu; less; mikrostruktura

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2023
• Tom: Vol. 69, nr 4
• Strony: 73--88
• Opis fizyczny: Bibliogr. 82 poz., il.

Twórcy

autor

Witowski Marcin

• Department of Building Structures, Geotechnics and Concrete, Building Research Institute, Warsaw, Poland

• https://orcid.org/0000-0001-6178-3852

autor

Godlewski Tomasz

• Building Research Institute, Warsaw, Poland

• https://orcid.org/0000-0001-7986-5995

autor

Nepelski Krzysztof

• Department of Construction Materials Engineering and Geoengineering, Lublin University of Technology, Lublin, Poland

• https://orcid.org/0000-0001-9495-6457

autor

Chyliński Filip

• Department of Building Structures, Geotechnics and Concrete, Building Research Institute, Warsaw, Poland

• https://orcid.org/0000-0002-7322-8087

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).