为研究保护层经一次爆除开挖即可达到质量要求和设计高程的新技术,即基岩保护层开挖一次爆除技术,我们于1982年和1985年分两阶段在万安水电工程中进行了试验。第一阶段预备性试验作探索比较,规模较小。第二阶段生产性试验规模较大,进行了综合性观测,爆后对基础作了整修,并由地质部门按基础验 In order to study the new technology that the protective layer can reach the quality requirements and design elevations after one blasting excavation, that is, the once blasting technology for the excavation of bedrock protective layer, we conducted in Wan’an hydropower project in two stages in 1982 and 1985 The test. The first phase of preparatory test for exploration comparison, smaller. The second phase of productive test larger scale, conducted a comprehensive observation, after the blast on the basis of the renovated, by the geological department by the basis of experience