石灰岩孔道试样压缩条件下变形与强度特征的试验研究

doi:10.13722/j.cnki.jrme.2015.0308

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Abstract A series of uniaxial and pseudo-triaxial compression tests on hollow cylinder specimens with 50 mm in outer diameter and 6–25 mm in inner diameter were carried out to study the effects of nonuniform stresses on the deformation，strength and failure characteristics. The test results show that：(1) There is no significant difference among peak strength，elastic modulus and hole diameter under uniaxial compression，failure patterns of specimens are tensile-shear failure，the hole remain hasn’t occur to collapse；(2) The effect of inner diameter on deformation characteristic isnt obvious before yield stage under the triaxial compression，but it has significant effect on the deformation characteristics of post-peak strength. There is no obvious difference between elastic modulus，inner diameter and and confining pressure；(3) The material strength of modified Coulomb prediction is more about 11% than uniaxial compression peak strength，which equals to regression results of intact specimen and has no direct connection to inner diameter and confining pressure. The effect of inner diameter and confining pressure is complex，when material strengths are predicted by modified twin-shear strength criterion. The predictive value of material strength is no significant difference between hole diameter and confining pressure when the inner diameter is less than 11 mm，it decreases as the inner diameter or confining pressure increase when hole diameter is more than 16 mm；(4) The failure characteristic of hollow specimens are affected by hole diameter and confining pressure under triaxial compression，the bearing capacity will decrease when the inner diameter is bigger.

Key words： rock mechanics hollow specimen scale effect strength criterion deformation and strength

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	Articles by authors
	SU Chengdong1
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	LI Bingyang1
	WU Qiuhong3

Cite this article:

SU Chengdong1,2,LI Bingyang1, et al. Experimental study on deformation and strength properties of hollow cylindrical specimens of limestone under compression[J]. , 2016, 35(S1): 2739-2748.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0308 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2739

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