Measurement of Induced Stress Change During Longwall Exploitation

0352367 - ÚGN 2011 CZ eng A - Abstract
Staš, Lubomír - Souček, Kamil - Hortvík, Karel - Kajzar, Vlastimil - Knejzlík, Jaromír
Measurement of Induced Stress Change During Longwall Exploitation.
Czech - Polish Workshop On Recent Geodynamics of the Sudeten and Adjacent Areas /11./. Praha: ÚSMH AV ČR, 2010 - (Schenk, V.; Kontny, B.). s. 27-27. ISBN N. ISSN N.
[Czech - Polish Workshop On Recent Geodynamics of the Sudeten and Adjacent Areas /11./. 04.11.2010-06.11.2010, Třešť]
Institutional research plan: CEZ:AV0Z30860518
Keywords : stress measurement * conical gauge probe * stress tensor
Subject RIV: DH - Mining, incl. Coal Mining

This paper describes the first experience from in-situ determination of the total stress tensor changes during a long wall extraction. A device using measurement of local deformations on conical ended borehole bottom was used for long term monitoring of stress changes induced by underground mining activity. The problems of rock stress and its measurement have been investigated in the Institute of Geonics for a long time. At present, we need a method for determination of stress and its changes as reaction to the impact of the underground human activity. The paper deals with principles and used metod of strass measurement, basic description of the equipment and experiment in situ. A new device for determination of stress change tensor was developed on the basis of strain measurement applied to a conical shaped borehole bottom. Within the frame of this development a special probe interlocked to data logger was realized. This type of device was used for the long-term monitoring of the stress – strain changes.
Permanent Link: http://hdl.handle.net/11104/0191887