Scholarly record
MONITORING SYSTEM OF ROCKBOLTING INTERACTION IN ROCK MASS CONDUCT UNDER SEISMIC ACTIVITY IN UNDEGROUND MINES
Abstract
In the paper underground monitoring measurement system for continuous measurement of load changes in instrumented rockbolts was presented. The use of anchor casings creates an effective method of protecting underground mine excavations in KGHM Polska Mied? S.A. mines. Foundation for technical assumptions of original monitoring method was trial measurement period carried out in two underground copper mines of KGHM Polska Mied? S.A. between 2005 and 2008. The main aim was to receive interaction between load variations measured in instrumented rockbolts in relation with seismic events in underground mining. Underground measurements were conducted using different types of rockbolts and specially developed prototype recording system. Method allowed continuous real-time measuring in relation with seismic tremors inducted by underground deposit extraction with room and pillar method. Given the past experience on the measurement of changes in load of anchors carried out in a continuous mode, work has been undertaken, the aim of which is to develop a new test method - using developed for this purpose, autonomous, adapted for installation in harsh mining conditions, modern device, enabling continuous monitoring of load changes of anchor housing, clear signaling of the emergence of emergencies or emergency and the possibility of recording and transmission, and thus the subsequent processing of the results of measurements. Testing of prototype devices has already been carried out in laboratory and underground conditions.
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