预应力锚索加固病险坝的实践与经验

我国有相当一部分大坝属病险坝，需要进行加固。预应力锚索加固大坝可改善坝体应力状态，增强大坝整体性，闭合水平裂缩缝，且具有施工方便，不影响电站正常运行和投资省等优点，是加固病险坝的有效可靠的方法之一。在预应力锚索加固大坝中，锚索安设的位置、锚固方式、锚索孔钻进、锚固浆体、预锚试验与监测等技术一项新的灌交都是影响大中固效果的重要因素，值得引起设计和施工人员的重视。

Practice and experience of reinforcing the dangerous dams with pre-stressed anchorage cable

A considerable part of dams in our country are the dangerous and abnormal dams that should be reinforced. The adoption of pre stressed anchorage cable to reinforce the dam could improve the stress conditions in the dam body, enhance the integrity of dam, close the horizontal cracks and has the advantages of easy construction, normal operation of power station and low investment so that it is one of effective and reliable methods of reinforcing dangerous dams. In the reinforcement of dam with pre stressed anchorage cable, the technical problems of setting position of anchorage cable, anchoring ways, anchorage cable hole drilling, anchorage slurry, pre anchoring test and monitoring are the key factors affecting the reinforcement effectiveness of dam and should be paid attention to by the designers and constructors.