粉砂岩三轴压缩试验中的试样尺寸效应研究

doi:10.13722/j.cnki.jrme.2018.0961

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Abstract Reliable test data constitutes the basis of studying rock strength and deformation features. In this paper，conventional triaxial compression(CTC) tests were performed systematically upon silty sandstone in order to study the size effect of rock samples by analyzing the influences of sample size on rock strength and deformation behaviors under different confining pressures. We consider first CTC tests on samples of the same diameter by varying the sample height. It is shown that given the confining pressure，as the height-diameter ratio increases，both the failure stress and the Poisson?s ratio decrease while the Young?s modulus increases. Particularly，when the height-diameter ratio is beyond the value of 2.2，the measured material strength，Young?s modulus and the Poisson?s ratio become stable. Further，an additional set of CTC tests with different confining pressures are carried out upon samples of 37 mm in diameter and with the height-diameter ratio of 2.0. We analyze the characteristics of rock strength and deformation and compare the results with those issued from the tests on the samples of 50 mm in diameter and with the height-diameter ratio of 2.0. It is concluded that in CTC tests the size effect on relatively uniform rocks like silty sandstone is mainly attributed to the influence of rock height-diameter ratio.

Key words： rock mechanics conventional triaxial compression test size effect height-diameter ratio；silty sandstone

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	Articles by authors
	ZHU Qizhi
	MIN Zhongze
	WANG Yanyan
	WANG Wei

Cite this article:

ZHU Qizhi,MIN Zhongze,WANG Yanyan, et al. Study on the size effect of silty sandstone samples under conventional triaxial compression[J]. , 2019, 38(S2): 3296-3303.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0961 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3296

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