文献类型：期刊文献

中文题名：小尺寸岩样单轴压缩试验尺寸效应研究

英文题名：Uniaxial compression test study on size effect of small size rock samples

作者：伍法权[1,2];乔磊[1];管圣功[1,2];张庆同[1];王兆远[1];伍劼[3]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[3]浙江岩创科技有限公司,浙江绍兴312000

年份：2021

卷号：40

期号：5

起止页码：865

中文期刊名：岩石力学与工程学报

外文期刊名：Chinese Journal of Rock Mechanics and Engineering

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20212410510218)、Scopus、北大核心、CSCD、北大核心2020

基金：国家自然科学基金资助项目(41831290);浙江省基础公益研究计划项目(LHQ20D020001);绍兴文理学院国际合作项目(2019LGGH1006)。

语种：中文

中文关键词：岩石力学;小尺寸岩样;尺寸效应;矿物颗粒;单轴压缩;CT扫描;3D轮廓仪

外文关键词：rock mechanics;small size rock samples;size effect;mineral grains;uniaxial compression;CT scan;3D profiler

中文摘要：主要研究小尺寸范围(直径20~50 mm)内玄武岩岩样和青砂岩岩样尺寸效应规律,使用高精度3D轮廓测量仪观测2种岩样内部矿物颗粒的组成形式,借用CT扫描观测岩样内部孔隙大小、形状和分布情况。分析岩样尺寸变化对单轴抗压强度、弹性模量和破坏形式的影响。试验发现在小尺寸范围内:(1)不同岩样中孔隙的大小、形状和分布情况对尺寸效应变化趋势有影响,青砂岩岩样尺寸效应曲线服从指数分布,玄武岩岩样尺寸效应曲线服从对数分布,结合现有对较大尺寸岩样的研究结果,采用分段拟合的方法能够更好地反映尺寸效应的规律;(2)岩样弹性模量随直径增加呈逐渐增大的趋势;(3)岩样总体破坏形式为,随着直径的增加由劈裂破坏到单斜面剪切破坏再到X状共轭斜面剪切破坏。

外文摘要：In this paper,the size effect of basalt samples and green sandstone samples in a small size range of 20–50 mm in diameter was studied. The compositions of mineral particles inside the samples were observed by a high-precision 3 D profilometer,and the size,shape and distribution of the pores inside the samples were obtained by a CT scanner. The influence of the sample size on the uniaxial compressive strength,the elastic modulus and the failure mode was analyzed. It is found that,within the small size range,the size,shape and distribution of the pores in different rock samples have an influence on the size effect. The size effect curves of green sandstone and basalt samples conform to exponential and logarithmic distributions respectively. Combining the existing conclusions on larger size rock samples,it is pointed out that the segmental fitting method can better reflect the size effect of rocks. It is also shown that,with increasing the sample diameter,the modulus of elasticity of the samples tends to gradually increase and the overall failure mode of the samples changes from splitting failure to monoclinic shear failure and then to X-shaped conjugate oblique shear failure.