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Static load test on instrumented pile – field data and numerical simulations

Krasiński A., Wiszniewski M.

Studia Geotechnica et Mechanica

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2017

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Vol. 39, nr 3

17--25

EN

Static load tests on foundation piles are generally carried out in order to determine load – the displacement characteristic of the pile head. For standard (basic) engineering practices this type of test usually provides enough information. However, the knowledge of force distribution along the pile core and its division into the friction along the shaft and the resistance under the base can be very useful. Such information can be obtained by strain gage pile instrumentation [1]. Significant investigations have been completed on this technology, proving its utility and correctness [8], [10], [12]. The results of static tests on instrumented piles are not easy to interpret. There are many factors and processes affecting the final outcome. In order to understand better the whole testing process and soil-structure behavior some investigations and numerical analyses were done. In the paper, real data from a field load test on instrumented piles is discussed and compared with numerical simulation of such a test in similar conditions. Differences and difficulties in the results interpretation with their possible reasons are discussed. Moreover, the authors used their own analytical solution for more reliable determination of force distribution along the pile. The work was presented at the XVII French-Polish Colloquium of Soil and Rock Mechanics, Łódź, 28–30 November 2016.

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Wykonanie i sterowanie platformą Stewarta-Gougha

Dolny K., Wiszniewski M., Piotrowski R.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2016

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Nr 51

41--44

PL

Platforma Stewarta-Gougha, wynaleziona w 1965 roku, nadal jest popularnym tematem prac inżynierskich i naukowych. Publikacje dotyczą przede wszystkim kinematyki, dynamiki i projektowania platformy. Oryginalna wersja platformy opierała się na siłownikach hydraulicznych. Obecnie coraz częściej są one zastępowane serwomechanizmami. Dzięki temu zwiększono dynamikę górnej platformy. Platforma Stewarta-Gougha z powodzeniem znajduje zastosowanie w różnego rodzaju symulatorach. Dzięki sześciu stopniom swobody jest w stanie symulować ruch pojazdu lub samolotu.

EN

Stewart-Gough platform, invented in 1965, is still a popular topic for engineering and scientific applications. Publications relate primarily to kinematics, dynamics and design platform. The original version of the platform based on the hydraulic cylinders. Today they are replaced by electric servomotors. Thereby the potential of the increase platform dynamics. Stewart-Gough platform successfully used in various types of simulators. With six degrees of freedom it is able to simulate the movement of a vehicle or aircraft.

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Badania wpływu dodatku biopolimeru na przepuszczalność piasku średniego

Biliniak M., Baryłka K., Wiszniewski M., Skutnik Z.

Inżynieria Morska i Geotechnika

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2015

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nr 3

310--312

PL

Wyniki badań współczynnika filtracji mieszaniny piasku średniego i gumy ksantanowej. Badania wykonane w nowoczesnym permeametrze wyposażonym w komorę trójosiową w Centrum Wodnym SGGW. Potwierdzenie znacznego obniżenia przewodności hydraulicznej gruntu niespoistego na skutek dodania biopolimeru.

EN

Results of permeability coefficient tests for a mixture of medium sand and xanthan gum biopolymer. The study performed in a modern permeameter provided with triaxial cell in Warsaw University of Life Science. Confirmation of a significant decrease in the hydraulic conductivity of noncohesive soil due to the biopolymer addition.