Research on Anti-sliding Stability of Gravity Dams Based on Double Reduction Coefficient Method
Since cohesion and internal friction angle play different roles in the process of rock and soil mass failure,the same reduction coefficient cannot truly reflect the failure process of gravity dam from sliding to instability.Taking a gravity dam in southwest China as the research object,a three-dimensional simulation model of dam body and foundation is established.Based on the double reduction coefficient method with different reduction coefficients for cohesion force and internal friction angle,the anti-sliding stability of the gravity dam under design earthquake is studied.The results show that the safety margin of gravity dam against sliding is exaggerated by the equal proportion strength reduction method.It is feasible to use the double reduction coefficient method to analyze the anti-sliding stability of gravity dam under earthquake action,and can more truly reflect the safety reserve of cohesion force and internal friction angle during sliding instability of gravity dam.
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