小尺寸岩样单轴压缩试验尺寸效应研究

doi:10.13722/j.cnki.jrme.2020.0555

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Abstract 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 3D 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.

Key words： rock mechanics small size rock samples size effect mineral grains uniaxial compression CT scan 3D profiler

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	Articles by authors
	WU Faquan1
	2
	QIAO Lei1
	GUAN Shenggong1
	2
	ZHANG Qingtong1
	WANG Zhaoyuan1
	WU Jie3

Cite this article:

WU Faquan1,2,QIAO Lei1, et al. Uniaxial compression test study on size effect of small size rock samples[J]. , 2021, 40(5): 865-873.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0555 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/865

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