Browsing by Subject "geotextiles"

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Access status: Open Access ,
Monitoring konstrukcji ziemnych przy zastosowaniu rozłożonych przestrzennie światłowodowych sensorów optycznych, zintegrowanych w geosyntetykach
(Wydawnictwa AGH, 2011) Wosniok, Aleksander; Krywult, Łukasz; Liehr, Sasza; Krebber, Katerina; Wendt, Mario; Chrost, Andrzej
In modern earthwork structures (roads and railway embankments, dikes and dams), it is common procedure to embed geosynthetics like non-woven and grid structures into their soil bodies. These geosynthetic materials act as filters, reinforcement and drainage elements. They are also integrated for strengthening of the earthwork structures and prevention from surface erosion. By incorporating sensors in the geotextiles, »smart« technical textiles can be realised. Such multifunctional technical textiles can interact with their environment and sense various measurement categories such as temperature, strain and chemical parameters which allow to detect and to locate the presence of any damages and destructions in real time. In comparison with traditional measuring systems (pressure cells, piezometers and inclinometers which produce only point measurements) fibre optic sensors are well suited for mentioned spatial distributed monitoring purposes. The very tiny optical fibres of a diameter of less then 1 mm can operate as sensors in strong electromagnetic fields, under »harsh« explosive and chemical environments and under ionizing radiation. The spatial distributed fibre optic sensors are based on Brillouin scattering in glass optical fibres and on optical time domain reflectometry (OTDR) in polymer optical fibres. The paper gives an overview of these innovative fibre optic sensors embedded in geosynthetics and presents field test results.
Access status: Open Access ,
Wpływ cyklicznego nasłoneczniania na przebicie statyczne wybranych geosyntetyków
(Wydawnictwa AGH, 2011) Cholewa, Mariusz; Lupa, Marcin
The paper presents results of tests of the static punch strength of chosen geosynthetics subjected to cycles of insolation amounting to 100 hours. Three geotextiles (GW-1: of knitted continuous filaments, GW-2: of welded continuous filaments and GW-3: of stitched continuous filaments), three geonets (GS-1: of the density of 16 openings per 1 cm2, GS-2: of the density of 1 opening per 1 cm2, GS-3: of the density of 1.0 openings per 1 cm2) and three geomembrans (GM-1: 0.3 mm thick, GM-2: 1.0 mm thick and GM-3 1.5 mm thick,) were used for the tests. The tests of punch shear were conducted in accordance with a method described in the standard PN-EN ISO 12236. For each of the nine materials, the results of tests of so called »fresh« and insolated samples were compared. It was shown that the influence of solar radiation received during 100 hours do not cause weakening geonets and geomembrans. It were only geotextiles that showed decreasing of strength value.
Access status: Open Access ,
Wytrzymałość na przebicie geosyntetycznych przesłon uszczelniających
(Wydawnictwa AGH, 2011) Cholewa, Mariusz; Job, Robert
The paper presents results of punch strength tests of protecting and sealing geosynthetics. Six types of geotextiles of different thickness and basis weight were chosen as protecting materials, two types of geomembrans of different thickness and one type of bentonit mat represented sealing materials. The tests were carried out separately for a set of the geotextiles and the geomembranes and for a set of the geotextiles, geomembranes and the bentonit mat. The measurements were taken according to the standard: PN-EN 14574. The results of the tests showed, that the punch strength of the set geomembrane + geotextile increases in proportion to the thickness of the materials and ranges from 0.73 to 2.62 kN in the dry test and from 0.76 to 2.88 kN while testing hydratised samples. Whereas the punch force of the set geotextile + geomembrane + bentonit mat ranges between 1.48 and 5.19 kN depending on the type of geomembrane and geotextile.