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Abstract Using self-designed visual model devices，macro-meso tests on pile tip penetration in layered media are carried out to study the impact of upper weak layer on variation of lower sand around pile tip. It shows that the critical depth of pile tip resistance exists in layered medium. Because of different tendencies of frictional resistance，the depth of pile tip penetration in layered medium is less than that in pure sand in order to reach the ultimate pile tip resistance；the layered media present different variations of particle?s directionality in meso side. Three-dimensional non-circle particle flow code numerical simulation program is developed to simulate the laboratory model tests of pile tip penetration in layered medium. The results of simulation have a better consistence with laboratory tests，building a foundation for the further study of macro-meso mechanism of soil variation around pile tip in the course of penetration.
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Received: 27 August 2011
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2012, Vol. 31 
