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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摘要针对石窟顶板文化信息丰富、变形突出和对扰动敏感度高的特点，采用扰动小、隐蔽性高的微小型柔性锚杆，能够满足锚固系统柔性变形和塑性状态极强的抗拉能力。为揭示砂岩石窟平顶窟顶板岩体微小型锚杆锚固技术的有效性和科学性，评价不同系列锚杆在不同工况下的锚固性能，选择直径8 mm的GFRP锚杆和NPR锚杆，植入不同孔径，在杆体–浆体界面布设应变片，采用循环加载模式开展现场拉拔试验。研究发现微小直径GFRP锚杆和NPR锚杆具有良好的锚固性能和界面变形协调性，GFRP锚杆具有更好的延展性和抗剪性，锚孔直径与锚杆直径之比为2～2.25倍时锚固效果最佳，研究成果为微小型柔性锚杆在砂岩石窟顶板岩体加固工程中的应用提供了依据和参考。

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	裴强强1
	2
	3
	4
	白玉书1
	崔凯1
	刘鸿2
	3
	4
	崔惠萍2
	3
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	李黎5

关键词 ：岩土工程, 石窟寺, 窟顶危岩体, 微小型锚杆, 锚固性能, 变形协调

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

引用本文:

裴强强1，2，3，4，白玉书1，崔凯1，刘鸿2，3，4，崔惠萍2，3，4，李黎5. 砂岩石窟微小型柔性锚杆锚固性能研究[J]. 岩石力学与工程学报, 2023, 42(2): 352-364.
PEI Qiangqiang1，2，3，4，BAI Yushu1，CUI Kai1，LIU Hong2，3，4，CUI Huiping2，3，4，LI Li5. Study on anchorage performance of micro-sized flexible anchors in sandstone grottoes. , 2023, 42(2): 352-364.

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

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