ABSTRACT
It is obvious that stresses and strains developed within shaft lining, during its construction and immediately after that, have an apparent impact on current shaft behavior and its load conditions. Today the values of those stresses, called the primary stresses, has been changed since shaft lining is now subjected to an additional load caused by ore exploitation within the adjacent areas. A numerical approach for the primary stress-strain prediction using the finite element method is presented. The shaft construction process was divided onto 95 phases assuming that the length of a single tubular lining element is about 10 m. During a given element construction, no load acting on it is assumed since any convergence of opened drill-hole walls are compensated by drilling operations. Therefore the element may be subjected to rock mass pressure not earlier than it is built-in and undermined later. The importance of the problem was illustrated using an actual example from one of the underground mine in the Legnica-Glogow Copper Basin (LGOM).
