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Geomechanics and Engineering
  Volume 15, Number 2, June10 2018 , pages 783-791

Prediction models of the shear modulus of normal or frozen soil-rock mixtures
Zhong Zhou, Hao Yang, Kai Xing and Wenyuan Gao

    In consideration of the mesoscopic structure of soil-rock mixtures in which the rock aggregates are wrapped by soil at normal temperatures, a two-layer embedded model of single-inclusion composite material was built to calculate the shear modulus of soil-rock mixtures. At a freezing temperature, an interface ice interlayer was placed between the soil and rock interface in the mesoscopic structure of the soil-rock mixtures. Considering that, a three-layer embedded model of double-inclusion composite materials and a multi-step multiphase micromechanics model were then built to calculate the shear modulus of the frozen soil-rock mixtures. Given the effect of pore structure of soil-rock mixtures at normal temperatures, its shear modulus was also calculated by using of the three-layer embedded model. Experimental comparison showed that compared with the two-layer embedded model, the effect predicted by the three-layer embedded model of the soil-rock mixtures was better. The shear modulus of the soil-rock mixtures gradually increased with the increase in rock regardless of temperature, and the increment rate of the shear modulus increased rapidly particularly when the rock content ranged from 50% to 70%. The shear modulus of the frozen soil-rock mixtures was nearly 3.7 times higher than that of the soil-rock mixtures at a normal temperature.
Key Words
    micromechanics; geo-composite material; shear modulus; the frozen soil-rock mixtures
Zhong Zhou, Kai Xing and Wenyuan Gao: School of Civil Engineering, Central South University, Changsha 410075, China

Hao Yang: 1.)School of Civil Engineering, Central South University, Changsha 410075, China
2.)Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, China

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