Slope stability analysis of Dagangshan Hydropower Station by strength reduction method

Based on ANSYS strength reduction method,taking the right bank slope at Dagangshan Hydropower Station as an example,by two-dimensional and three-dimensional model calculation,we study the influence of weak layer on slope stability,mechanism of slope instability,difference and relationship between two-dimensional analysis and three-dimensional analysis.We can extract six conclusions below: weak layer is important to the stability of a slope;the effect of engineering reinforcement to slope stability is evident;the failure of slope is a gradual progress of plastic area development and displacement increment,the development of plastic area reflects the stability state of a slope;there are some differences between two-dimensional calculation and three-dimensional calculation,which are caused by the difference of model,elements,meshing and element stress state,the results of three-dimensional calculation are more reliable.