贵州构皮滩地区裂隙系统及其对电站工程的影响研究

FRACTURE SYSTEM AND ITS EFFECT ON THE HYDROPOWER PROJECT IN THE GOUPITAN AREA,GUIZHOU

大坝、隧道等大型工程中的裂隙构造,由于关系到岩体的强度等工程安全问题,因此历来倍受关注。贵州乌江构皮滩电站坝区主要发育碳酸盐岩及少量碎屑岩,在其岩系中构造裂隙主要有NNW向、NWW向、NEE向和NE向,其中约80%已被方解石脉先后分四期充填愈合,大大降低了水的渗透,提高了岩石的强度;有少量裂隙没有被充填,或是充填以后又裂开,其中顺层滑动裂隙具一定的贯通性,工程上值得注意。

Fractures in large-scale engineering works such as dams and tunnels have long gained attention because they concem safety problems of engineering works such as the strength of rock masses. There mainly occur carbonate rocks with minor clastic rocks at the dam site of the Goupitan Hydropower Station, Wujiang, Guizhou, and the NE, NW, N--S and E--W sets of structural fractures may be recognized in the rock sequences. However, 80 percent of the fractures have been healed by three phases of calcite veins, thus greatly reducing water permeability and increasing the strength of rocks. Some fractures have not been filled or re-opened after filling, of which bedding-parallel slip fractures are throughgoing to a certain extent, to which attention should be paid in engineering works.