Comparative study of the convergence of a tunnel excavated in rock salt: Mathematical modelling, in-situ measurement, and numerical solution

摘要

One of the most important investigation methods of the geomechanical phenomena around the underground mining excavation is the mathematical modelling method. It allows the correlation of theoretical models with both the laboratory data and the field measurements. This paper presents the constitutive equations of Cristescu type [l]-[2], determined from a large number of distinct laboratory tests. The aim is to describe the time behaviour of rock salt around underground mining excavations. Generally, in the mathematical models used today one is making several simplifying assumptions, which could yield to some discrepancies when the results are compared with the measurements "in situ". Thus, mathematical models, which would describe more accurately the mechanical properties exhibited by rock salt, are needed.