Two-dimensional Model Tests on Fabric of Coarse-grained Soils

JIANG Jing-shan; CHENG Zhan-lin; ZUO Yong-zhen; DING Hong-shun

doi:10.3969/j.issn.1001-5485.2014.09.011

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Journal of Changjiang River Scientific Research Institute ›› 2014, Vol. 31 ›› Issue (9) : 59-64. DOI: 10.3969/j.issn.1001-5485.2014.09.011

ROCKSOIL ENGINEERING

Two-dimensional Model Tests on Fabric of Coarse-grained Soils

JIANG Jing-shan^1,2, CHENG Zhan-lin², ZUO Yong-zhen², DING Hong-shun²

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Abstract

The macro-mechanical properties of coarse-grained soils depend on its initial fabric and fabric variation in deformation process. Specimens of different initial fabric structures were prepared and two-dimensional parallel tests were conducted to investigate the influence of fabric on stress-strain relationship of coarse-grained soils. Particle movement was measured by computer image measure system, and fabric change in deformation process of coarse-grained soils was evaluated. Results show that (1) the stress-strain curves of parallel tests were different, which means fabric plays an important role in stress-strain relationship; (2) the orientations of branch vector and particle’s long axis enhanced with the increase of stress in the shear process before failure happened; (3) the peak deviatoric stresses increased with the increase of principal values of initial fabric; (4) the average branch length decreased slightly with the increasing of volumetric strain; (5) the average coordination number did not increase with the diminish of void ratio, which was probably related with polygon particles and big particles in small numbers.

Key words

coarse-grained soils / stress-strain relationship / fabric / branch vector / coordination number / particle’s long axis / triaxial tests

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JIANG Jing-shan, CHENG Zhan-lin, ZUO Yong-zhen, DING Hong-shun. Two-dimensional Model Tests on Fabric of Coarse-grained Soils[J]. Journal of Changjiang River Scientific Research Institute. 2014, 31(9): 59-64 https://doi.org/10.3969/j.issn.1001-5485.2014.09.011

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