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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摘要受复杂岩土环境影响，常用于工程加固的预应力锚索容易发生腐蚀而产生破坏。由于锚索埋藏深、隐蔽性强的工程特性，对其服役期间的健康状况难以把握。针对这一问题，依据预应力锚索健康评价体系，以环境指标、腐蚀状况、化学性能、力学性能、变形特征和时间因素为评价指标，通过现场开挖沙坪二级水电站无黏结预应力锚索，并结合室内化学和力学试验，从宏微观上综合评价无黏结预应力锚索的健康状况。结果表明，预应力锚索的不同部位在不同防腐措施下腐蚀程度不同，而力学性能基本无变化，且具有稳定良好的化学性能。内锚固段砂浆包裹体能提供足够的锚固力而不产生相对滑移或裂缝，完好的砂浆包裹体有效避免了锚索因腐蚀而破坏。在弱腐蚀岩土工程环境中，服役年限不长的预应力锚索健康状况基本良好，其研究方法与结果可为类似工程预应力锚索健康状况评估提供借鉴。

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	黎慧珊1
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	王玉杰1
	孙兴松1
	赵宇飞1
	石北啸2
	姜龙1

关键词 ：岩土工程, 无黏结预应力锚索, 健康状况, 评价体系, 评价指标, 现场开挖试验, 室内检测试验

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

引用本文:

黎慧珊1，2，王玉杰1，孙兴松1，赵宇飞1，石北啸2，姜龙1. 无黏结预应力锚索运行健康状况分析与评价[J]. 岩石力学与工程学报, 2019, 38(S1): 2913-2924.
LI Huishan1，2，WANG Yujie1，SUN Xingsong1，ZHAO Yufei1，SHI Beixiao2，JIANG Long1. Analysis and assessment of health status of unbonded prestressed anchors. , 2019, 38(S1): 2913-2924.

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

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