Abstract
Ground subsidence is a subject of investigation in two potash mines in New brunswick, Canada. Geometry of salt and potash deposits and mining methods in the two mines are different. The goal of the investigation is to obtain a better understanding of the mechanism of the salt rock deformation and to develop prediction models of gorund subsidence through a comparison of numerical models with observed ground subsidence. Two monitoring networks have been observed annually over the past several years using terrestrial geodetic measurements of high precision and the satellite Global Positioning System (GPS). A method for numerical modelling of the behaviour of the salt rock and overlain brittle rocks has been developed. The method uses sequential finite element linear elastic solutions in which the salt rock is treated as a non-Newtonian liquid and the overburden brittle rocks are considered as a non-tension material. Preliminary results are summarized.
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