Influence of particle shape and size on the dynamic soil properties

DOI Web Site 参考文献17件
  • Manne Akhila
    Geotechnical Engineering Laboratory, Earthquake Engineering Research Centre,International Institute of Information Technology Hyderabad
  • Devarakonda Neelima S.
    Geotechnical Engineering Laboratory, Earthquake Engineering Research Centre,International Institute of Information Technology Hyderabad

抄録

Shear modulus and damping ratio which are important parameters in any dynamic analysis of soil are related to the frictional behavior at inter particle contacts and rearrangement of grains. The strength loss of granular soil when subjected to cyclic loading is affected by particle size, shape and its distribution. Soil structure also termed as fabric which encompasses grains/particle distribution, particle orientation and arrangement, the voids and the fluid present in between the voids, continually changes during cyclic loading. Such changes are imperative of mechanisms that result in liquefaction of saturated sands and compaction of dry sands. Unlike, experimental and analytical testing methods, numerical methods are equipped to provide insight into these underlying mechanisms. To understand the interactions between particles that influence the dynamic behavior of soil, modeling of cyclic triaxial test was conducted using 3D DEM for different particle shapes and sizes. Before the testing, validation of the generated soil sample is conducted by checking the pressure dependent behavior and dilative response of the sample. Contact normals and contact forces were also used to validate the sample at different stages. From the cyclic testing, normalized shear modulus curves, contact normal and force distributions were plotted. It was observed that the rounded particles had more shear stiffness compared to other shapes. This behavior was not evident when the shear modulus was normalized and the spherical particles had the highest stiffness. The effect of particle shape was verified with the change in the coefficient of uniformity (Cu) with stiffness and it was observed that shear modulus decrease with an increase of Cu. Micromechanical expression for the same was also been discussed.

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