无黏结预应力锚索运行健康状况分析与评价

doi:10.13722/j.cnki.jrme.2017.0868

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Abstract In the complex geological circumstance，prestressed anchors were prone to corrosion，which resulted in properties degradation or even failure. However，it was hard to know the health statue of the anchors accurately due to the high embedment depth and concealment. An in-situ anchor excavated experiment at Shaping II hydropower station was conducted. According to the health assessment system of prestressed anchors，the environmental index，corrosion status，chemical and mechanical properties changes，deformable features and operating time were investigated synthetically. Chemical and mechanical tests were used to evaluate the health statue of the anchors in both macro and micro perspectives. The results show that the different parts of the anchors are in different corrosion degrees because of the varied corrosion prevention measures. The prevention methods of the free and fixed part of the anchors are better than the one of the anchor head. The study results also indicate that the undamaged cement grout has positive effects on anchoring and steel strand corrosion prevention. It can be concluded that the anchors from the experiment are in good working condition，and there are no noticeable chemical and mechanical properties changes that are detected in the tests. The research methods and results could be used as reference for health assessment of similar prestressed anchors.

Key words： geotechnical engineering prestressed anchor health status assessment system assessment index in-situ excavated experiment detecting test

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	Articles by authors
	LI Huishan1
	2
	WANG Yujie1
	SUN Xingsong1
	ZHAO Yufei1
	SHI Beixiao2
	JIANG Long1

Cite this article:

LI Huishan1,2,WANG Yujie1, et al. Analysis and assessment of health status of unbonded prestressed anchors[J]. , 2019, 38(S1): 2913-2924.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0868 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2913

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