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- Title
Grunto, veikiamo periodinėmis apkrovomis, elgsenos tyrimai.
- Authors
Skuodis, Šarūnas; Karpis, Rokas; Zakarka, Mindaugas; Gedvilas, Modestas; Raginis, Vytautas; Orlova, Kornelija; Katauskas, Mantas
- Abstract
This paper presents the results of a cyclic triaxial test on soil, namely gravely sand. These tests are very important for the evaluation of engineering geological and geotechnical conditions when the strata is loaded with cyclic loads. The provided research work shows the resilient Young's modulus change according to cycles quantity, stress deviator change and applied cell pressure. During the investigations, the constant cycles frequency (1 Hz) was applied. This frequency imitates moving road loads (moving car's first and second axis load on road construction). Cycles quantity could be used for ranking materials on the basis of their plastic deformability. During this research it was obtained that investigated soil behaviour acts as stable deformation behaviour (plastic shakedown). The conditioning phase was realised using stress deviator values from 10 to 200 kPa with total cycles quantity 20 000. Analysing soil behaviour at the conditioning phase it was obtained that total sample deformation is less than 2.0% and resilient strain in the middle of the sample is less than 0.5%. According to characteristic permanent axial strain, investigated soil is classified as C3 class. The repeated loading phase was realised using stress deviators from 10 to 200 kPa with cell pressure from 20 to 70 kPa. Repeated loading for resilient testing showed that the resilient Young's modulus depends on applied cell pressure and stress deviator minimum and maximum values. The investigated soil sample shape after tests was almost the same as before the tests. Obtained results are very valuable when it is necessary to evaluate soil behaviour under different cyclic loading and load stresses. Also, when repeated loading tests are provided with different cell pressures it is possible to imitate soil layer behaviour in different depths.
- Subjects
YOUNG'S modulus; CYCLIC loads; BALLAST (Railroads); GEOTECHNICAL engineering; ROAD construction; LIVE loads; SILT
- Publication
Geologija. Geografija, 2018, Vol 4, Issue 4, p159
- ISSN
2351-7549
- Publication type
Article