Some experiences simulating ground vibration through FEM models

摘要

This paper tries to show the development of a FEM model to predict ground vibrations due to blasting, a very complex problem involving many factors very difficult to quantify: ground anisotropy and its randomn behaviour, aleatory variations in the blasting shots initiation, the different actions of each shot over the rock mass, measurements liability used in model calibration (seismograph resolution or correct sensor fixation), etc. The analysis of a wide blasting with a high number of shots could guide one to define a very complex problem. We will try to simplify the problem using a blasting with a low number of shots, but where all the referred complex factors are still present, and it is taken as an example to explain what problems we usually encounter and how to operate when we work on blasting modelization.