通过对官地水电工程坝区断裂系统 ,特别是缓角断裂的发育分布及变形破裂形迹研究 ,认为该坝区缓倾角断裂的形成 ,受控于构造和浅表生改造 ,并从构造应力场演化探讨了缓倾角断裂的构造成因 ,建立其构造成因模式 ;根据缓倾角断裂的浅表生改造特征 ,探讨它的浅表生改造模式。 Based on the study of the development and distribution of fracture systems and the deformation and rupture of slow-break faults in Guandi hydropower project, it is considered that the formation of gentle dip fracture in the dam area is controlled by tectonic and superficial remodeling, and from the tectonic stress field The evolution causes the tectonic causation of gentle dip fracture and establishes its tectonic causation model. According to the superficial remodeling features of gentle dip fracture, its superficial remodeling mode is discussed.