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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Measurement of Tensor Stress Changes by Conical Gauge Probe in Ostrava-Karvina Coal Basin
 Staš, Lubomír ; Souček, Kamil ; Knejzlík, Jaromír ; Waclawik, P. ; Palla, L.
A device designed on base of measurement local deformations on compact conical ended borehole was used for long term monitoring of stress changes induced by closed underground human activity.The changes of stress state of rock mass impacted by progress of long-wall were investigated. This experiment demonstrated that monitored strain changes on borehole bottom are formed both by geomechanical situation based on a progress of long-wall and perhaps by local geomechanical situation based on stress redistribution after boring of measuring borehole and on plastic deformation of creeping rock material.
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Using of a conical gauge probe to long term monitoring of the stress changes
 Staš, Lubomír ; Souček, Kamil ; Knejzlík, Jaromír ; Palla, L.
In frame of development of new device to full stress tensor measurement a simplified variant of gauge probe was completed. This variant, which is connected to datalogger by cable, is very good for long term monitoring of the stress changes. Functionality of that was verified not only on laboratory also in-situ in carboniferous rock mass during detection of the stress changes in relation to long wall progress.
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