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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摘要为探讨寒区边坡工程岩体受冻融循环和开挖卸荷双重作用的影响规律，对经历不同冻融循环次数的砂岩进行单轴、三轴压缩及峰前卸围压3种力学试验，重点研究冻融循环后砂岩在卸荷应力路径下的力学性能和破坏特征。试验结果表明：(1) 冻融循环次数增加导致岩样峰值强度和弹性模量逐渐减小。(2) 相同围压降低量下，岩样径向应变与体应变变化较大，轴向应变变化相对较小。(3) 冻融损伤越大，径向应变和体应变对围压降低越敏感。(4) 岩样变形模量在卸围压过程中逐渐降低，冻融循环次数越高降低速率越小，且初始变形模量越低。(5) 泊松比在卸围压过程中逐渐增大，冻融循环次数越高增速越低，泊松比增长初期与体应变大致呈线性关系。(6) 不同冻融循环次数下岩样单轴压缩破坏模式均为劈裂破坏；常规三轴压缩破坏模式均为剪切破坏，剪切带大致沿端面对角开展，并伴随局部岩块掉落；峰前卸围压破坏模式为介于单轴和常规三轴间的混合模式。

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关键词 ：岩石力学, 冻融循环, 三轴卸围压, 砂岩, 力学特性, 破坏模式

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

引用本文:

俞缙1，傅国锋1，陈旭2，郭晓颖1. 冻融循环后砂岩三轴卸围压力学特性试验研究[J]. 岩石力学与工程学报, 2015, 34(10): 2001-2009.
YU Jin1，FU Guofeng1，CHEN Xu2，GUO Xiaoying1. EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF SANDSTONE AFTER FREEZING-THAWING CYCLES UNDER TRIAXIAL CONFINING PRESSURE UNLOADING. , 2015, 34(10): 2001-2009.

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

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