丹达河水电站工程高陡边坡开挖施工与质量控制

High and steep slope excavation and quality control of Dandahe Hydropower Station

丹达河水电站工程两岸边坡均为高陡峭边坡,施工难度大。为此,结合工程实际情况,开挖过程中采用预先河床堆渣,再由河床出渣的方式进行坝基开挖,从而解决了无法布置施工道路的难题;针对坝基开挖层较薄,表层风化较为严重,两岸坡裂隙、断层发育,强风化破碎带分布较多,为确保混凝土拱对坝基及岸坡的质量要求,对爆破的装药结构及布孔方式进行了调整,从而保证了开挖的效果及质量。

Dandahe Hydropower Station has high and steep slopes by both banks, rendering much construction difficulties. According to the actual conditions of the project, spoil was filled into the river bed to form an access road for excavation spoil transportation of dam foundation, so as to solve the arrangement problem of construction road. Dam foundation excavation layer is relatively thin with fairly serious surface weathering. Both bank slopes have fissures and faults developed with considerable intensely weathered crushed belts. In order to make foundation and bank slopes up to requirements of concrete arch dam, explosive charging structure and holes＇ arrangement were adjusted, so as to ensure excavation effect and quality.