Differences in Strength Properties of Soil-Rock Mixture under Simple Shear and Triaxial Compression

LI Hao-min; RAO Xi-bao; JIANG Ji-wei; XU Han; LU Yi-wei; LIU Wei

doi:10.11988/ckyyb.20211199

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (3) : 105-111. DOI: 10.11988/ckyyb.20211199

ROCK-SOIL ENGINEERING

Differences in Strength Properties of Soil-Rock Mixture under Simple Shear and Triaxial Compression

LI Hao-min, RAO Xi-bao, JIANG Ji-wei, XU Han, LU Yi-wei, LIU Wei

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Abstract

Large-scale laminar-ring simple shear test and large-scale triaxial test of soil-rock mixture(SRM) were carried out. The stress state of samples in simple shear was analyzed according to the joint test law of granular material and sand in simple shear. The differences in the strength properties of SRM under simple shear and triaxial compression were then explored. Results reveal that: (i) With the same minimum principal stress, the rate of maximum principal stress in simple shear is lower and changes in a smaller range, and the peak value of principal stress ratio is lower, which means the ultimate Mohr's circle of stress is smaller. (ii) The secant shear modulus under simple shear is anisotropic, and the secant shear modulus in horizontal direction is constantly lower than that under triaxial compression, but such difference shortens with the decrease of non-coaxiality degree between principal stress axes and principal strain axes. (iii) For the samples used, the shear strength indices of Mohr-Coulomb strength criterion obtained under simple shear are significantly lower than those under triaxial compression, and in particular, the internal friction angle is about 9.5% lower. Preliminary investigation shows that the rotation of principal stress axes and non-coaxiality in simple shear are important reasons for the differences of strength properties of SRM.

Key words

soil-rock mixture / strength properties / large-scale simple shear test / large-scale triaxial test / rotation of principal stress axes / non-coaxiality

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LI Hao-min, RAO Xi-bao, JIANG Ji-wei, XU Han, LU Yi-wei, LIU Wei. Differences in Strength Properties of Soil-Rock Mixture under Simple Shear and Triaxial Compression[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(3): 105-111 https://doi.org/10.11988/ckyyb.20211199

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