The Assessment of Shaft Lining Strength Parameters Based on the Results of Core Tests Taken Using an Innovative Drilling Set

Abstract

In accordance with the regulations in force in Poland since November 2016, the assessment of the technical condition of ore pass and
shaft linings requires the testing of the shaft wall both by non-destructive and destructive methods. The collection of material for destructive
testing is particularly difficult due to the lack of devices adapted for core drilling in shafts. In order to enable safe and precise
sampling for strength tests in conditions characteristic for mining shafts, an innovative drilling assembly with pneumatic drive was
developed. To confirm the effectiveness of the developed equipment, underground test runs have been carried out. Cores taken from the
shaft wall were assessed for quality and precision of workmanship. Then, on the basis of the results of destructive testing of the taken
core samples, the possibilities of their use for assessing the strength parameters of the shaft lining were determined.