高土石坝复合加筋抗震加固技术开发与应用

针对高土石坝的抗震安全这一我国西部强震区水电开发中的重要问题,在总结以往高土石坝抗震措施优缺点的基础上,同时吸收柔性加筋材料(土工格栅)和刚性加筋材料(钢筋)在高土石坝抗震加固方面的优点,开发了一种高土石坝复合加筋抗震加固技术,并阐明了高土石坝复合加筋抗震加固技术的开发背景、结构形式及技术特点。通过大型振动台模型对比试验验证复合加筋抗震措施的有效性和可靠性,结果表明:与未加筋模型坝比较,复合加筋抗震加固技术能降低坝体地震永久变形,有效抑制坝顶堆石松动,具有一定的减震与隔震作用。该复合加筋抗震加固技术已在坝高295 m高的两河口心墙堆石坝抗震设计中得到应用。

Technological development of composite reinforcement aseismic measure for high earth rockfill dams and its application

The aseismic safety of high earth rockfill dams is one of the key problems in hydropower development in western China, where strong earthquakes often occur. Based on a summary of advantages and disadvantages of previous aseismic measures for high earth rockfill dams, a composite reinforcement aseismic measure(CRAM)and the related construction method were developed. The CRAM also takes advantage of the strong aseismic performances of the flexible material(geogrid)and rigid material(steel bars). The development background, structural form, and technical features of the CRAM are introduced. The effectiveness and reliability of the CRAM were validated through comparative model tests using a large-scale shaking table. The results show that the CRAM can effectively decrease the earthquake-induced permanent deformation and inhibit the loosening of rockfill at the crest, and has certain effects on shock absorption and isolation. Finally, an engineering application of the CRAM in the aseismic design of the Lianghekou Earth Rockfill Dam, 295m in height, is introduced.