Geomechanics and Engineering

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Prediction models of the shear modulus of normal or frozen soil-rock mixtures

  • Zhou, Zhong (School of Civil Engineering, Central South University) ;
  • Yang, Hao (School of Civil Engineering, Central South University) ;
  • Xing, Kai (School of Civil Engineering, Central South University) ;
  • Gao, Wenyuan (School of Civil Engineering, Central South University)
  • Received : 2017.04.08
  • Accepted : 2017.12.23
  • Published : 2018.06.10
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Abstract

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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Central South University, Tongji University

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