冻融循环后砂岩三轴卸围压力学特性试验研究

doi:10.13722/j.cnki.jrme.2015.0977

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Abstract The influence of freezing-thawing cycles and unloading effect in slope engineering were investigated in the excavation of rock in the cold region. Experiments of uniaxial and triaxial compression and triaxial confining pressure unloading were carried out to the sandstone samples experienced different freezing-thawing cycles. The peak strength and the elastic modulus of rock were found to decrease gradually with the increase of the freezing-thawing cycles. The radial strain and the volume strain were changed greatly but the axial strain variation was relatively small under the same decrement of confining pressure. The greater the freezing-thawing damage was，the more sensitive of the radial and volume strains to the decrement of confining pressure. The deformation modulus of rock decreased gradually in the process of confining pressure unloading. With the increase of the freezing-thawing cycles，the reduction rate of the deformation modulus and initial deformation modulus decreased. Poisson?s ratio was gradually increased during the unloading of confining pressure. With the increase of freezing-thawing cycles，the growth rate of Poisson?s ratio decreased. The relationship between the increase of Poisson's ratio in the initial stage and the volume strain was approximately linear. The failure pattern of rock under different freezing-thawing cycles in uniaxial compression test was splitting failure and in conventional triaxial compression test was shear failure. The shear zone was developed roughly along the diagonal of the rock end face. This phenomenon was accompanied by the rock fall off. The failure mode in triaxial confining pressure unloading test before peak failure was the mixture of those in the uniaxial and triaxial compression tests.

Key words： rock mechanics freezing-thawing cycles triaxial unloading confining pressure sandstone mechanical properties failure pattern

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0977 OR http://www.rockmech.org/EN/Y2015/V34/I10/2001

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