基于修正拟动力法的岩质边坡三维稳定性分析方法及应用OA北大核心CSTPCDEI

The seismic design of rock slopes is a critical issue in geotechnical engineering,with their stability being directly connected to both engineering safety and socio-economic benefits.Owing to the nonlinear strength characteristics of rock,the failure patterns and mechanisms of rock slopes are substantially different from those of soil slopes,necessitating distinct analytical methods and design principles.Moreover,seismic forces are among the primary factors leading to the destabilization of rock slopes,exerting a significant impact on their stability.To better determine the seismic design method for rock slopes based on the Hoek-Brown strength criterion,this paper constructed a three-dimensional logarithmic spiral failure prediction model under the framework of the upper bound theorem of limit analysis,which aligned more closely with the actual failure mechanism of rock slope instability.By utilizing discretization techniques and the generalized tangent technology,the parameters of the Hoek-Brown criterion were converted into the computable parameters of the Mohr-Coulomb criterion and then integrated into the prediction model,proposing a more accurate model for the seismic stability analysis of rock slopes.This model can consider the nonlinear strength characteristics of rocks,and improve the prediction accuracy of seismic forces by introducing seismic acceleration and damping ratio parameters through the modified pseudo-dynamic method.Then,the gravity increase method and the Multi-Verse Optimizer were combined to obtain a method for determining the critical safety factor of the slope,and the 3D stability assessment of the rock slope under seismic action was realized.Compared with the existing research results and application to engineering cases,this method can more accurately evaluate the seismic stability of rock slopes,and also reflect the instability failure mode and range of rock slopes.It has good effectiveness and reliability in the seismic stability analysis of rock slopes.It provides new ideas and references for further optimizing the seismic design method of rock slopes.