Study on the Development Characteristics of Ductile Shear Zone andDeformation Response of Slope Excavation in a Hydropower Station

Study on the Development Characteristics of Ductile Shear Zone andDeformation Response of Slope Excavation in a Hydropower Station

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The high rock slope on the right bank of a hydropower station on Lancang river, which isto be built, is excavated for nearly 400 m.According to the on-site geological survey, the rockmass of the slope is hard and brittle dacite with strong unloading, and small and medium-sizedfaults developed in the slope.In addition, there are click here two ductile shear zones that dipping towardto the inside slope in the right bank slope,and mylonization occurs in the shear zone, which leadsto the very complex geological conditions and rock mass structure of the right bank slope.Inorder to study the mechanism and rule of deformation response of high rock slope excavation underthis condition, this paper selects the right-bank dam axis slope of hydropower station as theresearch object, and simulates the excavation process of the slope by the UDEC (universal distinctelement code).The results show that:(1) The excavation results in large deformation of theshallow rock mass in the ductile shear zone, which affects the stability of the slope; (2) Thedeformation caused by excavation is mainly controlled by the unloading fissure and overflowsurface that dipping toward to the outside slope, and the geological-mechanical deformation andfailure mode is mainly slipping iphone xr price calgary and fracturing; (3) The slope mainly occurs lateral displacementafter excavation, and its cumulative displacement mode is transmission to high elevation andaccumulation at the trailing edge; (4) The slope excavation and the resulting deformation energyare kept in sync, and finally affected by the elastic recovery lag of rock mass, and the residualdeformation is small near the end of excavation.