循环冲击损伤后大理岩静态断裂力学特性研究

doi:10.13722/j.cnki.jrme.2019.0323

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Abstract To study the static fracturing characteristics of marble after cyclic impact damage，cyclic impact loading test under a fixed pressure of 0.10 MPa was carried out on notched semi-circular bend(NSCB) samples by using split Hopkinson pressure bar(SHPB) system for preparing the samples with different degrees of initial damage，and static three-point bending fracture test was performed on the damage samples. The results show that the sub-critical cracks in samples initiate and propagate continuously at a low speed with increasing cyclic impact number and the dynamic peak stress and elastic modulus decrease under equal energy impacts. In the three-point bending fracture test，the static fracturing mechanical properties of samples degrade with increasing the cumulative damage with a maximum decrease of 52.37% in fracture toughness and a maximum increase of 140.49% in failure displacement. There is a linear negative correlation between the fracture toughness and the dynamic cumulative damage with a coefficient of determination(R2) of 0.98. The time distribution of AE events tends to be uniform and the total cumulative number of events increases greatly with increasing sample damage. When the samples are damaged，the cracks begin at the tip of the prefabricated crack and then extend to the loading point. With increasing impact damage，the crack propagation path tends to be tortuous. The local strain concentration zone can well predict the final failure modes of samples.

Key words： rock mechanics SHPB impact damage fracture toughness failure morphology

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	Articles by authors
	FU Anqi1
	YU Liyuan1
	2
	SU Haijian1
	JING Hongwen1
	FAN Pengxian2
	ZHANG Tao1

Cite this article:

FU Anqi1,YU Liyuan1,2, et al. Experimental study on static fracturing mechanical characteristics of marble after cyclic impact loading[J]. , 2019, 38(10): 2021-2030.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0323 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I10/2021

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