Construction technologies of pre-stressed anchorage cable for high slope fracture zone of discharge tunnel in right bank of Xiluodu Hydropower Station

In the berm foundation at El525 high slope of discharge tunnel outlet of right bank discharge tunnel in Xiluodu Hydropower Station,there are 2 consequent unloading fissures.In order to ensure the stability of high slope,the pre-stress anchorage cable support is adopted.Based on the features of rock breaking and fissure development,grouting is carried out with anchorage cable threaded every two holes,and then cleaning hole bottom and threading cable again,so as to prevent the grout mixing up and seeping into adjacent holes,thus the grouting compactness is ensured.The concrete sampling from anchorage pier and stress testing show that the tension is with good results and the anchorage cable works normally.