Strength anisotropy of fibre-reinforced sands under multiaxial loading

被引:32
作者
Mandolini, A. [1 ]
Diambra, A. [1 ]
Ibraim, E. [1 ]
机构
[1] Univ Bristol, Bristol, Avon, England
来源
GEOTECHNIQUE | 2019年 / 69卷 / 03期
基金
英国工程与自然科学研究理事会;
关键词
anisotropy; ground improvement; laboratory tests; reinforced soils; sands; stress path; PRINCIPAL STRESS ROTATION; APPARATUS; BEHAVIOR; CLAY;
D O I
10.1680/jgeot.17.P.102
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The strength anisotropy of fibre-reinforced sands in the multiaxial stress space has been investigated using a hollow cylinder torsional apparatus. Probing stress paths under constant cell pressure have been performed on both unreinforced and reinforced sand specimens to assess the influence of the orientation of the principal stress directions on the fibre strengthening contribution. For the first time, a deviatoric strength envelope for fibre-reinforced soils in the multiaxial stress space was identified. The addition of fibres produces an anisotropic increase and a distortion of the deviatoric strength envelope if compared to the unreinforced soil matrix. The fibre strengthening contribution is governed by the tensile strain domain developed and the fibre orientation distribution. Further observations on the effect of the addition of fibres on the volumetric response, principal stress and strain rate non-coaxiality, as well as the shear bands formation of the composite, are presented. An analytical model to capture the anisotropic fibre strengthening contribution is developed and discussed.
引用
收藏
页码:203 / 216
页数:14
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