高预应力和围岩加载速率对高强高韧锚杆钢变形行为的影响研究

doi:10.13722/j.cnki.jrme.2022.1164

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Abstract In deep engineering，the development and application of novel metallic materials has attracted many attentions. However，the influence of prestressing process and rock loading process on high-strength and high-toughness steel for rock bolts remains still unclear，and relevant research is urgently required. Muzhailing highway tunnel with extremely high in-situ stress area was taken as the engineering background，combined the physically based crystal plasticity model，and NPR steel was taken as an example to study the effects of high prestress and rock loading rate on the plastic deformation behaviors of high-strength and high-toughness steel. The results show that the rock loading rate plays a major role on affecting the strain capacity of bolt steel，and the ultimate strain and deformation relaxation of bolt steel will increase with the decrease of the rock loading rate. It is found that the large deformation capacity of bolt steel can be significantly enhanced when the rock loading rate is controlled lower than 10－2 MPa/s. In addition，there will be obvious strain relaxation phenomenon for bolt steel as the prestress is higher than 600 MPa. The bolt steel will exhibit stress relaxation as the prestress increases higher than 800 MPa，which may result in the loss of prestress for rock bolt and should be paid attention. The research results provide theoretical basis and technical guidance for practical application of high-strength and high-toughness steel for rock support engineering in high in-situ stress field.

Key words： rock mechanics high in-situ stress NPR steel surrounding rock large deformation prestress loading rate crystal plasticity

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	Articles by authors
	WANG Ding1
	2
	HE Manchao1
	TAO Zhigang1
	GUO Aipeng1
	WANG Xuchun3

Cite this article:

WANG Ding1,2,HE Manchao1, et al. Effects of high prestress and rock loading rate on deformation behaviors of high-strength and high-toughness steel for rock bolts[J]. , 2023, 42(9): 2212-2223.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1164 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I9/2212

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