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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF COMBINED SPECIMEN WITH ROCK AND SHOTCRETE UNDER FREEZING-THAWING CYCLES |
| (Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China) |
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Abstract The gray sandstone from disaster area of extreme ice and snow in early 2008 is selected to make the combined specimen with gray sandstone and C20 shotcrete. Through different kinds of tests，i.e. freezing-thawing cycling test，uniaxial compression test，triaxial compression test under medium and low confining pressures，direct shear test under medium and low axial pressures，micro-scanning test，the macroscopic physico-mechanical properties of combined specimen with rock and shotcrete and its micro-damage mechanism are both studied systematically. The test results reveal the damage mode，failure criterion and variation of strength indices of the combined specimen with different water contents(dried or saturated) after different freezing-thawing cycles. Based on the above results，the damage softening statistical constitutive models for combined specimen with rock and shotcrete before and after freezing-thawing are established. By contrast with the curves of triaxial compression test，the new damage softening statistical constitutive models can truly reflect the entire damage process and the models are considered to be reliable.
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Received: 13 May 2010
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2010, Vol. 29 
