1.前言近年来,地质条件好的坝址越来越少,以河床砂砾、软岩等为基础的大坝正在不断增加。大河内水电站(纯抽水蓄能电站),计划建在典型的隆起准平原地形的吉备高原地区东部。上库的坝建在隆起准平原地带5处鞍部地区。隆起准平原地带,通常形成很厚的风化带,地质调查的结果,上库各坝址的基础,有的地方软岩分布很厚。因此,需要对各坝基的处理方法进行研究。 1. Foreword In recent years, dam sites with good geological conditions have become fewer and fewer, and dams based on grit of riverbed, soft rock and the like are continually increasing. Dahe Hydropower Station (Pure Pumped Storage Station) is planned to be built in the eastern part of the Kibi Plateau, a typical uplifted plains terrain. Dam on the library built in the uplift of the plain area 5 saddle area. Uplift of the plains, usually formed a thick weathered belt, the result of geological surveys, the foundation of the dam site, in some places the distribution of soft rock is very thick. Therefore, the treatment of each dam foundation needs to be studied.