BFRP筋锚固节理岩体剪切行为试验研究

doi:10.13722/j.cnki.jrme.2021.0894

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Abstract Basalt Fiber Reinforced Polymer(BFRP) is gradually used as bolts in underground engineering. In order to study the shear characteristics of jointed rocks reinforced with BFRP bars，laboratory shear tests were carried out to comparatively analyze the shear properties of bolted joint rocks with BFRP bars and steel bars，including shear strength-displacement curve，shear strength，bolt failure characteristics and internal force changes in the bolts，and the influence factors such as roughness，bolt inclination and normal strength were also considered. The results show that，compared with the steel bolts，the BFRP bolted specimens have a lower shear stiffness，a larger peak shear displacement and a higher residual shear strength. The BFRP bolted specimens absorb more energy before the shear peak than the steel bar bolted specimens，although both them absorb the same total energy and exhibit toughness in the shear process. The shear strength of the BFRP bar bolted joint rocks is greatly affected by the inclination angle with a lower shear strength when the inclination angle is equal to 90°. When the inclination angle is reduced to less than 60°，the BFRP bolted specimens have a higher shear strength than the steel bar bolted specimens. The shear failure characteristics of BFRP bolted joint rocks can be categorized as：resin matrix fracture，shearing of both resin matrix and fibers，and fracturing of resin matrix and surrounding rock. When the BFRP bars fail，there is no obvious plastic yield. The resin matrix frequently breaks under a small shear displacement，while the fiber is able to resist a large joint dislocation which improves the contribution of the normal stress to the shear strength. Based on the strain monitoring data，the contribution rates of the axial force and shear force from the BFRP bars and the steel bars to the shear strength were quantitatively analyzed at an inclination angle of 60°. It was found that，compared with the steel bars，the axial force of the BFRP bolts increases faster under the same shear displacement and there was a greater contribution from the axial force to the shear strength.

Key words： rock mechanics BFRP bolt inclination angle shear strength failure characteristics strain

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	Articles by authors
	ZHANG Shubo1
	2
	WANG Changsheng1
	2
	WANG Gang1
	2
	WU Xuezhen3
	ZHENG Xin1
	2
	HE Peng1
	2
	XU Feng1
	2

Cite this article:

ZHANG Shubo1,2,WANG Changsheng1, et al. Experimental study on the shear behaviors of bolted rock joints reinforced with BFRP bars#br#[J]. , 2022, 41(4): 712-724.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0894 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/712

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