应力路径和颗粒级配对砂土变形影响的细观机制

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Abstract The laboratory triaxial tests and numerical tests of Qingdao sea sands with different grain size gradations under different stress paths are carried out by using the GDS stress path triaxial system and particle flow code in two dimensions(PFC2D)，in order to study the mesomechanism of the influence of stress path and grain size gradation on sands mechanical behavior. The macromechanical properties of Qingdao sea sands are obtained by three stress paths triaxial tests；and the deformation mechanism is analyzed preliminarily. Numerical tests are presented as the match and complement of laboratory tests. Some meso-information such as particle coordination number，rotational velocity and particle displacement，which cannot be obtained from laboratory tests，are extracted to explain quantitatively the meso-reasons of the peculiar mechanical behavior of sands with different gradations and stress paths. The numerical tests of different gradations particles under cyclic loads are also presented；and the macromechanical behavior and its mesomechanism are given.

Key words： soil mechanics Qingdao sea sand stress path grain gradation triaxial tests numerical tests mesomechanism

Received: 21 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I11/2334

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