Abstract: In order to meet the basic requirements of the geological conditions of the concrete double-curved arch dam of the Busanga hydropower station(the dam bedrock mass is required to be intact and uniform, high strength, and simple geological structure), it is necessary to study the quality of the foundation rock mass in the dam site area and explore geological defects inside the rock mass. The seismic wave computerized tomography(CT) test of the rock mass between the excavated aditsintwo abutments of the dam site is carried out, and the wave velocity distribution law of the engineering rock mass in the test area is obtained. According to the variation characteristics of seismic wave CT imaging wave velocity distribution, the structural characteristics of the rock mass in the dam site, the spatial distribution of geological defects such as the quality of the rock mass, the geological structure and the weak rock zone are determined, and the basic geological conditions of the engineering rock mass in the dam site area are revealed, and the good application effect is obtained. The purpose of investigation is achieved, which provides reliable basic data for dam engineering design.

Key words: hydropower station, quality of foundation rock mass, adit, seismic wave CT technology, result analysis

摘要： 为满足布桑加水电站混凝土双曲拱坝对地质条件的基本要求(即坝基岩体完整均一、强度高、地质构造简单等),需要研究坝址区基础岩体质量状况,并探查岩体内部是否存在地质缺陷,利用坝址区两坝肩已开挖探洞实施洞间岩体地震波CT测试,获得测试区域工程岩体的波速分布规律。依据地震波CT成像波速分布变化特点判定坝址工程岩体结构特征、工程岩体质量以及地质构造、软弱岩带等地质缺陷的空间分布等,揭示了坝址区工程岩体的基本地质条件,取得了良好的应用效果,达到了勘察测试的目的,为大坝工程设计提供了可靠的基础资料。

关键词: 水电站, 基础岩体质量, 探洞, 地震波CT技术, 成果分析