爆炸作用下隧道拱肩I/II复合型裂纹起裂及扩展规律研究

doi:10.13722/j.cnki.jrme.2021.0372

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Abstract In this paper，a rock tunnel model with a spandrel crack(RTMSC) was proposed，and the initiation and propagation rule of mixed mode I/II cracks under blast loading were studied. Crack propagation gauge and strain gauge were used in the experiment to monitor crack initiation，propagation and arrest. AUTODYN code was used for numerical simulation，and ABAQUS code was used to calculate the dynamic stress intensity factors and(SIFs). The results show that：(1) in the process of crack propagation，there are crack arrest points on the propagation paths in which crack propagation time is relatively long，(2) bore locations affect crack initiation，arrest and propagation significantly，(3) in the process of crack propagation，the dynamic energy release rate is not a constant，and (4) with increasing the crack propagation speed，critical SIFs of both mode I and mode II decrease gradually.

Key words： tunnelling engineering mixed mode I/II crack blast loading initiation and arrest propagation speed tunnel spandrel dynamic stress intensity factor

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	Articles by authors
	LIU Bang1
	2
	ZHU Zheming3
	LIU Ruifeng4
	LI Meng5
	WANG Xiangli1
	2
	WANDuanying3

Cite this article:

LIU Bang1,2,ZHU Zheming3, et al. Study on initiation and propagation law of mixed mode I/II cracks in tunnel spandrel under explosion[J]. , 2021, 40(10): 2048-2061.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0372 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2048

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