拉西瓦水电站地下厂房顶拱1500kN预应力锚索设计与施工应用

Design of Pre-stressed Anchor Cable with 1 500 kN for Arch Crown of Underground Power House of Laxiwa Hydropower Station

为了保证施工期及运行期地下洞室的稳定，根据地质条件在拉西瓦水电站地下厂房顶拱施工中采用了1500kN无粘结预应力锚索加固，其主要内容包括预应力锚索的设计、钻孔、锚索制安、灌浆、垫座及外锚头混凝土浇筑、张拉。阐述了大型地下洞室在不良地质下采用预应力锚索加固的必要性和重要性。

In order to ensure the stability during both construction and operation periods, under the geological conditions, it is determined that the prestressed anchor cable with 1500N is used for the arch crown of underground power house. The design concerns with prestressed anchor cable, broach, installation, grouting, pillow, anchor head concrete pouring, tensile elongation. The impoetance and necessity of application the pre-stress anchor cable for the large scale underground grotto are expounded.