小湾水电站堆积体边坡支护与锚索技术应用

Reinforcing of deposit slopes of Xiaowan Hydropower Station and application of prestressed anchorage cables

分析小湾水电站堆积体边坡支护措施,研究预应力锚索技术的应用。分析认为,研究区边坡支护综合运用了工程护坡和生态护坡等边坡处理技术,预应力锚索是其主体工程,锚索孔钻孔和灌浆是该技术应用中的难点和重点,使用偏心跟管钻进技术和同心跟管钻进技术能有效解决钻孔难以成孔的问题;通过在锚索体外裹土工布和细帆布的方法,既保证了水泥结石对自由段锚索体的保护,又减少了浆量损耗,避免浆体浪费。

With regard to the deposit slopes of Xiaowan Hydropower Station,the relevant reinforcing measures were analyzed,and the application of prestressed anchorage cables was highlighted.The results indicate that the slope reinforcements in the study area comprehensively adopt engineering protection and ecological protection techniques.The pre-stressing anchorage cables are the principal part of the engineering,and their drilling and grouting are the difficulty and keystone of the anchorage technology.The technology of concentric drilling and eccentric drilling with pipes can availably solve boring problem.By wrapping geotextile and thin canvas outside the prestressed steel strand,it can make concrete calculi protect steel strand of tensile section and reduce grouting quantity so as to avoid grouting waste.