岩石抗压强度的尺寸效应及端部约束的离散元数值模拟

doi:10.13722/j.cnki.jrme.2014.s2.005

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Abstract In order to understand the size effect of compression strength of rocks caused by the end constraint conditions，a bond contact model of rocks based on micromechanical test data was implemented into the two-dimensional distinct element code for simulating the uniaxial compression tests of rock samples with different slenderness ratios under different constraint conditions. The simulation results were compared with theoretical solutions. The simulation results confirm that end constraint is one of the reasons causing the size effect of uniaxial compression strength of a homogenous rock sample，and the size effect disappears when the ends of the samples are frictionless. Under the same constraint conditions，the samples with a larger slenderness ratio break at a smaller number of bond breakage，so the uniaxial compression strength decreases with the increase of the slenderness ratio until it reaches a steady value when the ratio exceeds 2.0. The strength of rock samples with a small slenderness ratio increases with the increase of the friction coefficient of the ends of samples until it reaches a steady value when the coefficient exceeds 0.5. In addition，the number of bond breakages at failure and the proportion of bond compression-shear-torsion failure substantially increase with the increase of friction coefficient.

Key words： rock mechanics strength of rock distinct element method size effect uniaxial compression test

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	Articles by authors
	SUN Chao1
	2
	LIU Fang1
	2
	3
	JIANG Mingjing1
	2
	3
	CHEN He1
	2

Cite this article:

SUN Chao1,2,LIU Fang1, et al. SIZE EFFECT OF COMPRESSION STRENGTH AND END CONSTRAINT OF ROCKS BY DISTINCT ELEMENT SIMULATION[J]. , 2014, 33(S2): 3421-3428.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.005 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3421

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