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一、基本情况(一)大江电厂基础断层强透水区的主要水文工程地质条件葛洲坝水利枢纽大江电厂17~#～21~#机组的基础岩体主要是下白垩系石门组地层,其岩性为钙质、钙泥质、泥钙质及泥质胶结的厚层砾岩,强度较高。该区段内出露有 f_(126)断层组 f_(114)断层和一条层间溶蚀错动面(Cf—001)。f_(126)断层组是由5条斜列搭接的断层延续组成,沿断层带溶蚀现象较显著,导水性良好。f_(114)断层宽度一般为20～40厘米,沿挤压面有1～5厘米
I. Basic Conditions (I) Main Hydrological Engineering Geological Conditions of the Strong Permeable Zone in the Dajiang Power Plant The basic rock mass of the Gezhouba Water Control Project, Dajiang Power Plant, No. 17 ~ # ~ 21 ~ # unit is mainly the Lower Cretaceous Shimen Formation with lithology of Calcareous, calcareous, calcareous and muddy cemented thick conglomerates with high intensity. In this section, f_ (114) fault and an interlaminar migration fault surface (Cf-001) are exposed. The f_ (126) fault group is formed by continuation of faults with five oblique columns overlapping. The fault along the fault zone is more obvious and has good water conductivity. f_ (114) fault width is generally 20 to 40 cm along the extrusion surface 1 to 5 cm