水工建筑物的工程地质勘探工作,通常都是采用小直径钻探来获取地下资料。但是,小直径钻探在特殊地质条件下取不出岩心,或者取出了岩心也不能全面反映情况,作不出正确的判断。如果开凿竖井,不仅劳动强度大,掘进效率低,在河床中开凿施工更为困难,而且有爆破裂隙影响。因此,几年来我们一直试图搞大直径钻孔,也作了一些力所能及的准备,并探索和试验了有关问题,力争尽快地掌握这项新技术。 Engineering Geological exploration of hydraulic structures, usually using small diameter drilling to obtain underground information. However, small-diameter drilling can not take out cores under special geological conditions or the core can not fully reflect the situation and can not make correct judgments. If you open the shaft, not only labor-intensive, low efficiency tunneling, digging in the river bed construction more difficult, but also the impact of blasting cracks. Therefore, we have been trying to drill large diameter holes for several years. We have also made some preparation to the best of our ability and have explored and tested the relevant issues in an effort to grasp this new technology as soon as possible.