砂岩石窟微小型柔性锚杆锚固性能研究

doi:10.13722/j.cnki.jrme.2022.0287

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Abstract Aiming at the characteristics of rich cultural information，prominent deformation and high sensitivity to disturbance for grotto roof，the micro-sized flexible anchors with little disturbance and high concealment can meet the strong tensile resistance to flexible deformation and plastic state of anchorage system. In order to reveal the effectiveness and scientificity of micro-sized anchorage technology used in rock mass of flat roof of sandstone grottoes，as well as to evaluate the anchorage performance of different series of anchors under various operating conditions，GFRP and NPR anchors with a diameter of 8 mm were selected and implanted with different apertures，the strain gauge was laid at the rod body-paste interface，and then the field pull-out test was conducted in cyclic loading mode. The results show that micro-diameter GFRP and NPR anchors have good anchoring performance and interface deformation coordination，and GFRP anchors have better ductility and shear resistance. What?s more，the anchoring effect performs best when the ratio of the diameter of the anchor span to that of the anchor rod reaches 2–2.25 times. The research provides a basis and reference for the application of micro-sized flexible anchors in the reinforcement engineering of rock mass of sandstone grottoes roof.

Key words： geotechnical engineering cave temples dangerous rock mass on grotto roof micro-sized anchor anchorage performance deformation coordination

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	Articles by authors
	PEI Qiangqiang1
	2
	3
	4
	BAI Yushu1
	CUI Kai1
	LIU Hong2
	3
	4
	CUI Huiping2
	3
	4
	LI Li5

Cite this article:

PEI Qiangqiang1,2,3, et al. Study on anchorage performance of micro-sized flexible anchors in sandstone grottoes[J]. , 2023, 42(2): 352-364.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0287 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/352

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