饱水与晶体粒度对北山花岗岩断裂韧度影响的试验研究

doi:10.13722/j.cnki.jrme.2016.1248

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Abstract

The fracture toughness(K_IC) of five typical granites taken from the Beishan candidate area for geological disposal of high-level radioactive waste was investigated through three-point bending test，with the purpose to study the influence of saturation process and grain size on K_IC of granite. By comparing the curves of dry and saturated granite under cyclic loading and unloading condition，it is indicated that the saturation process can result in a significant degradation of initial cracking strength and fracture toughness，and accelerate the crack propagation speed in post-peak phase. Experimental data show that K_IC of dry and saturated samples are 1 576– 2 139 N/cm^1.⁵ and 1 463–1 848 N/cm^1.5，respectively，and mean values of K_IC of saturated granite are about 90% of dry ones in the same group. Meanwhile，it is noticed that K_IC of Beishan granite decreases remarkably with the increase of average particle size，rock mineral composition and particle forms also have certain influence on the variation of K_IC. At last，the fracture propagation process were analyzed with the recorded AE events.

Key words： rock mechanics Beishan granite fracture toughness saturation grain size Acoustic emission

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	Articles by authors
	LI Ying1
	CHEN Liang1
	LIU Jianfeng2
	LIU Jian1
	WANG Chunping1
	WANG Ju1

Cite this article:

LI Ying1,CHEN Liang1,LIU Jianfeng2, et al. Experimental study on influence of saturation process and grain size on the fracture toughness of the Beishan granite[J]. , 2018, 37(S1): 3169-3177.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1248 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3169

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