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拉力集中全长黏结型锚索长期耐久性研究
引用本文:任爱武,汪彦枢,王玉杰,陈祖煜,姜昭群.拉力集中全长黏结型锚索长期耐久性研究[J].岩石力学与工程学报,2011,30(3):493-499.
作者姓名:任爱武  汪彦枢  王玉杰  陈祖煜  姜昭群
作者单位:(1. 中国水利水电科学研究院 岩土工程研究所,北京 100044;2. 中国地质科学院 探矿工艺研究所,四川 成都 611734)
基金项目:“十一五”国家科技支撑计划项目(2008BAB29B01-5)
摘    要: 拉力集中全长黏结型锚索曾在我国重大水电工程中得到广泛应用,针对这些用作永久支护的锚索工程使用寿命以及是否会有一天成为工程的“定时炸弹”的问题,通过现场开挖一根在漫湾水电站左岸边坡服役20 a的锚索,对这一问题进行初步讨论。结合开挖试验成果,从锚头锈蚀特征、钢绞线缩进量、水泥砂浆防锈效果、内锚固段特征以及钢绞线化学和力学性质变化等方面,对拉力集中全长黏结型锚索的长期运行效果进行综合评价。得到如下结论:(1) 全长黏结型锚索对于锚头锚具的要求较低,该工艺锚索在任何一个位置发生损坏断裂后,都将不至于由于一处的损坏而导致锚固工程整体的破坏;全长黏结可以有效地阻止锚索失效链条的进一步发展;(2) 水泥砂浆可以起到很好的防锈效果,但对于锚头位置仅采用混凝土浇筑的防锈工艺并不能达到理想的效果;(3) 开挖锚索内锚固段未发现任何横向裂纹,证明在适当的预应力范围内水泥砂浆可以达到较好的锚固效果;(4) 开挖锚索服役20 a后,钢绞线的化学成分和力学性质均未发生明显变化。

关 键 词:水利工程拉力集中全长黏结型锚索耐久性服役20  a锚索现场开挖试验
收稿时间:2010-04-23;

RESEARCH ON DURABILITY OF CONCENTRATED TENSION AND FULL-BONDED ANCHOR CABLES
REN Aiwu,WANG Yanshu,WANG Yujie,CHEN Zuyu,JIANG Zhaoqun.RESEARCH ON DURABILITY OF CONCENTRATED TENSION AND FULL-BONDED ANCHOR CABLES[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(3):493-499.
Authors:REN Aiwu  WANG Yanshu  WANG Yujie  CHEN Zuyu  JIANG Zhaoqun
Affiliation:(1. Institute of Geotechnical Engineering,China Institute of Water Resources and Hydropower Research,Beijing 100044,China;; 2. Institute of Exploration Technology,Chinese Academy of Geological Science,Chengdu,Sichuan 611734,China)
Abstract:The anchor cables,which are concentrated tension and full-bonded type,are used to be applied in national important hydropower projects widely. Whether would these cables be a time-bomb of those national important hydropower projects? It?s a big problem bothering all the engineers. So the problem is studied by an in-situ cable excavated experiment which had been worked underground for twenty years at Manwan hydropower station. Based on experimental results,the research is done through five aspects. There are the features of anchor head,anchor retraction quantity,rust prevention effect,inner fixed anchor and the chemical and mechanical properties changes of tendon. Finally four results are achieved. The first one is that full-bonded art is a good type to prevent the whole anchorage failure just because of part damage. The second one is that cement grout is a good staff to prevent the steel strand corroding. However,its effect is not very well to prevent the corrosion growing on anchor head part. The third one is that there is no cracks found at inner fixed anchor. That is good fact to prove that inner fixed anchor can work well in a suitable prestress just using cement grout. The last one,the chemical and mechanical properties changes of tendon after twenty years? work are still in the acceptable range of standard.
Keywords:hydraulic engineering  concentrated tension and full-bonded anchor cable  durability  anchor cable worked underground for twenty years  in-situ excavation experiment  
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