Evaluation method for expressway rock slope stability based on numerical simulation

摘要

Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example. the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock biast- ing process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analysed of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting, and discusses of the blasting vibration influence to the rocky cut slope from many sides. the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress displacement, velocity and acceleration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the expressway rocky slope from desaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.