丰满老坝加固预应力锚索服役近30年后性能评价研究

doi:10.13722/j.cnki.jrme.2021.0381

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摘要预应力锚索被广泛用于混凝土坝的加固，其长期耐久性受到广泛关注。为探讨预应力锚索的耐久性在坝体高碱性环境中能否得到保障，依托丰满老坝拆除工程，对坝体中服役近30 a的有黏结和无黏结2种预应力锚索进行现场开挖，并结合室内检测手段，从锚头及索体锈蚀外貌、锈蚀程度、化学性质以及力学性能对丰满老坝预应力锚索服役性能进行了研究。同时应用电化学测试技术评价了索体材料的耐蚀性，对坝体内部预应力锚索锈蚀的成因进行了分析。主要结论如下：(1) 服役近30 a的有黏结预应力锚索索体的平均腐蚀率超过了2%，表明混凝土坝体碱性环境并不能有效抑制预应力锚索发生腐蚀；(2) 在防腐效果上，坝体中的无黏结预应力锚索优于有黏结预应力锚索；(3) 服役近30 a的有黏结和无黏结预应力锚索试样中，有51.3%的弹性模量低于规范《预应力混凝土用钢绞线》(GB/T 5224—2014)的要求。

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	王玉杰1
	尹韬1
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	孙兴松1
	赵宇飞1

关键词 ：水利工程, 预应力锚索, 服役性能, 锚索锈蚀, 现场开挖

Abstract：Since the prestressed anchors were widely used in concrete dam reinforcement，their long-term durability has been increasingly concerned. To validate the durability of the prestressed anchors in the high alkaline environment of dam bodies，the field exhumation of anchor cables which have served for nearly 30 years in old Fengman dam was performed during the demolition progress of the dam，and the anchor samples were collected and tested in the laboratory for evaluating the durability performance of the prestressed anchors in Fengman old dam including the corrosion appearance and corrosion degree，and the chemical and mechanical properties. The electrochemical test was conducted to analyze the anchor corrosion resistance and to assess the causes of the anchor corrosion. The main conclusions are summarized as follows：(1) the average corrosion rate of the bonded prestressed anchors in service for nearly 30 years is higher than 2%，which indicates that the alkaline environment in concrete dams can not effectively inhibit the corrosion of the prestressed anchors. (2) The unbonded anchors in the dam body have better performance in corrosion resistance than the bonded anchors，and (3) after nearly 30 years¢ service，the elastic modulus of 51.3% anchor samples is below the limit of “the Steel Strand for Prestressed Concrete”(GB/T 5224—2014).

Key words： hydraulic engineering prestressed anchor cable service performance corrosion of anchor field exhumation

引用本文:

王玉杰1，尹韬1，2，孙兴松1，赵宇飞1 . 丰满老坝加固预应力锚索服役近30年后性能评价研究[J]. 岩石力学与工程学报, 2022, 41(1): 62-69.
WANG Yujie1，YIN Tao1，2，SUN Xingsong1，ZHAO Yufei1. Performance evaluation of prestressed anchors embedded in old Fengman dam after nearly 30 years service. , 2022, 41(1): 62-69.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0381 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I1/62

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