Complex method of interpreting results of non-destructive testing of shaft lining concrete strenght

In testing quality of shaft linings, which are main communication passages in underground mines, determining mechanical and physio-chemical parameters of a lining, and above all rate_of their change in relation to initial values, has decisive meaning for the proper assessment of the technical state of the whole construction. In the article, which was drawn up on the basis of Doctoral Thesis, a method which allows to minimize estimation error of concrete compressive strength, widely used as a lining material in active GZW (Uppersilesian Coal Basin) shafts, was presented. The effect of conducted laboratory and underground testing was developing patterns and a programme to measure compressive strength, depending on number of rebounds and ultrasound waves speed with a method of combined interpretation of results. Developed patterns can be used both in case of concrete lining, from which core samples were collected, as well as linings, from which taking samples was impossible. In the process of their verification it was demonstrated, that their application in interpreting results of non-destructive testing of shaft lining has, in principle improved the credibility of assessment of concrete compressive strength.