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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.
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Received: 23 April 2010
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2011, Vol. 30 
