摘要
基于对现场4～5年预应力锚固结构腐蚀数据的分析，探讨了实际工程中预应力索体腐蚀的外观规律性表现，表现为“三段式”以及具有明显的应力不均匀特征，而其主要影响因素则是岩体中含有腐蚀介质的水。在此基础上．采用单位长度腐蚀量算法对外锚头部位自由段索体在富水环境中的使用年限进行了初步预测，得到单根预应力锚索的实际使用寿命为16年左右。详细分析了影响预应力锚固结构耐久性的各种因素，提出了锚固体系防腐的一些措施。最后，根据现场试验结论，提出了实际工程中预应力锚固系统的二次加固技术，可为临界失稳预应力锚固系统的二次处理提供参考。
Based on the analysis of corrosion data of prestressed anchorage structures that have been in operation for four to five years in situ, the regular appearance of anchorage structures subject to corrosion was discussed. The appearance is of＂tristage＂ and has obvious stress nonuniformity,and the primary factor that have great influence upon the corrosion of anchorage structures is the water containing corrosion medium. The conception of corrosion weight per unit length was introduced to analyze the service life of cables in outer anchorage head. The actual service life of single prestressed anchorage cables in wet environment is only about sixteen years. Some factors that influence the durability of the anchorage structure were analyzed in detail, and some anticormsive measures were also brought forward. Finally, based on the test conclusions of field, the secondary reinforcement technique of prestressed anchorage structures was put forward, which can provide references for second strengthening of critical destabilization anchorage structures.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第2期30-33,39,共5页
Journal of Highway and Transportation Research and Development
基金
山东省交通厅资助项目(2005y002)
关键词
道路工程
耐久性
试验研究
寿命预测
二次加固
road engineering
durability
experimental investigation
life forecast
secondary reinforcement
