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Wymiarowanie fundamentów na podstawie analizy parametrów geotechnicznych oznaczonych według PN-B-03020:1981 i PN-EN 1997-1:2008

Mieloch Joanna, Węgliński Szymon

Przegląd Budowlany

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2024

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R. 95, nr 3

102--105

PL

Ocena i analiza parametrów geotechnicznych należy do najważniejszego etapu projektowania fundamentów, także ze względu na możliwość ograniczenia robót ziemnych niekorzystnie wpływających na środowisko naturalne. Na przykładzie posadowienia hali przemysłowej, po przeprowadzonym rozpoznaniu podłoża gruntowego oceniono parametry gruntów i dokonano obliczeń nośności podłoża oraz zaprojektowano fundamenty zgodnie z normą PN-B-03020:1981 oraz PN-EN 1997-1:2008. Przedstawiono wnioski i wyniki dotyczące wykorzystania nośności podłoża oraz oceny parametrów geotechnicznych w zależności od przyjętego wariantu obliczeniowego.

EN

Assessment and analysis of geotechnical parameters is the most important stage of foundation design, also due to the possibility of limiting earthworks that adversely affect the natural environment. Using the example of the foundation of an industrial hall, the soil parameters were assessed and the bearing capacity of the subgrade was calculated, and the foundations were designed in accordance with the PN-B-03020:1981 and PN-EN 1997-1:2008 standards. Conclusions and results regarding the use of the bearing capacity of the subsoil and the assessment of geotechnical parameters depending on the carried calculation variant are presented.

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Experimental verification of integrity of low-pressure injection piles structure – pile internal capacity

Pachla H.

Studia Geotechnica et Mechanica

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2017

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Vol. 39, nr 4

77--85

EN

The idea of strengthening the foundation using injection piles lies in transferring loads from the foundation to the piles Anchorage in existing structure and formed in the soil. Such a system has to be able to transfer loads from the foundation to the pile and from the pile onto the soil. Pile structure often reinforced with steel element has to also be able to transfer such a loading. According to the rules of continuum mechanics, the bearing capacity of such a system and a deformation of its individual elements can be determined by way of an analysis of the contact problem of three interfaces. Each of these surfaces is determined by different couples of materials. Those surfaces create: pile-foundation anchorage, bonding between reinforcement and material from which the pile is formed and pilesoil interface. What is essential is that on the contact surfaces the deformation of materials which adhere to each other can vary and depends on the mechanical properties and geometry of these surfaces. Engineering practice and experimental research point out that the failure in such structures occurs at interfaces. The paper is concentrating on presenting the experiments on interaction between cement grout and various types of steel reinforcement. The tests were conducted on the special low pressure injection piles widely used to strengthen foundations of already existing structures of historical buildings due to the technology of formation and injection pressure.

3

Influence of soil parameters changes on the bearing capacity of soil

Harabinová S., Kotrasová K.

Roczniki Inżynierii Budowlanej

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2017

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z. 17

85--90

EN

The strength of soil is a key parameter in designing foundations and other earth structures. In shallow foundation design, the capacity of the foundation to support footing load is dependent on the soil’s bearing capacity which is a function of its strength parameters. According to [4], bearing capacity is the maximum pressure that the soil can support at foundation level without failure. Proper interpretation of specific shear strength parameters of clay and the application of this case to bearing capacity problems was presented and reviewed in this paper. The influence of the shear strength parameters of subsoil on its bearing capacity are very important, especially, when changing the angle of internal friction. The results of calculations for low plastic clay subsoil, shown in the work, illustrate exemplary how a level of its bearing capacity can be determined with significant errors when using incorrect shear parameters of soil.

4

Conditions of proper interaction of low-pressure injection piles (LIP) with structure and soil, carrying capacity of pile anchorage in foundation

Pachla H.

Studia Geotechnica et Mechanica

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2016

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Vol. 38, nr 4

33--49

EN

The formation of a pile in the existing foundation and soil creates a new foundation construction which has a structure of foundation-pile-soil. This construction must be able to transfer loads from the foundation to the pile and from the pile to the soil. The pile structure has to transfer an imposed load. From the point of view of continuum mechanics determination of the capacity of such a system is preceded by the analysis of contact problem of three contact surfaces. Each of these surfaces is determined by different pairs of materials. The pair which creates a pile anchorage is a material from which the foundation is built (structure of stone and grout, brick and grout, concrete or reinforced concrete and grout. The pile structure is formed by grout and steel rebar. The pile formed in soil is created by a pair of grout and soil. What is important is that on contact surfaces the materials adhering to one another are subjected to different deformation types that are controlled by mechanical properties and geometry of these surfaces. In the paper, additional conditions that should be fulfilled for the foundation-pile-soil system to make load transfer from foundation to soil possible and safe are presented. The results of research done by the author on foundation-pile contact surface are discussed. The tests were targeted at verifying the bearing capacity of anchorage and deformation of piles made of grout and other materials from which foundations are built. The specimens were tested in tension and compression. The experiments were conducted on the amount specimens which is regarded as small sample to enable the statistical analysis of the results.

5

Some economic aspects of Eurocode 7 introduction in geotechnical design on the example of spread foundation

Borowiec A.

Czasopismo Techniczne. Budownictwo

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2014

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R. 111, z. 1-B

119--127

EN

This paper discusses how new or alternative methods of design influences the cost of foundations and thus the investment. The paper also looks at the introduction of a new standard in geotechnical design – Eurocode 7, which took place in 2010. In order to illustrate problems associated with foundation spread, calculations are carried out for old polish and new European standards. To give some quantitative measurements of cost-effectiveness, the index of loadcapacity (LCU) is used to help define the economical index.

PL

Artykuł włącza się do dyskusji na temat o tym, czy i w jaki sposób nowe normy geotechniczne generują dodatkowe koszty lub podwyższają całkowity koszt inwestycji, poprzez na przykład przewymiarowanie fundamentów. Miarą opłacalności nie są wskaźniki ekonomiczne, lecz Wskaźnik Wykorzystania Nośności. W celu zilustrowania problemu przedstawiono porównawcze obliczenia dla fundamentu bezpośredniego.

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Weryfikacja parametrów podłoża gruntowego z wykorzystaniem analizy wstecznej na przykładzie wiaduktu drogowego

Nepelski K.

Budownictwo i Architektura

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2014

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Vol. 13, nr 2

39--48

PL

W pracy zaproponowano metodę modelowania niejednorodnego podłoża oraz dobór jego parametrów. W artykule opisano analizę posadowienia wiaduktu drogowego. Wykonano obliczenia numeryczne MES podpory wiaduktu łącznie z bryłą podłoża gruntowego zdefiniowanego modelem Cam Clay. Przeprowadzono szereg obliczeń z wykorzystaniem zmiennych parametrów podłoża. Wyniki porównano z pomiarami geodezyjnymi. Postępując zgodnie z zasadami analizy wstecznej zweryfikowano właściwości podłoża wyznaczone za pomocą badań laboratoryjnych oraz odwiertów.

EN

The paper presents the analysis of foundation of the road bridge. The numerical calculation of the bridge abutment was made in FEM Software with subsoil modelled as solid defined by Cam Clay model. Number of calculations was made by using variable parameters of soil. Results were compared with geodetic measurements. Soil properties designated by lab test and geological boreholes, were verified with computer back analysis results.