Record details

Title
    Monitoring of tilts and microtremors for detection of slope failure in the forefield of an open pit mine
Statement of responsibility
    Lumír Skalský, Vladimír Tobyáš
Author
    Skalský, Lumír
    Tobyáš, Vladimír
Language
    anglicky
Source title - serial
    Acta montana. Series A, Geodynamics
Vol./nr.
    No. 9(100)
Pages
    p. 225-236
Year
    1996
Notes
    3 obr., 1 tab., 2 s.bibl.
    Zkr. název ser.: Acta montana
Subject group
    mikroseizmy
    monitoring
    sesuv
    severočeská pánev
    sklon
    těžba povrchová
    uhlí hnědé
Geographical name
    ČR-Čechy
    Krušné hory
Keyword
    Detection
    Failure
    Forefield
    Microtremors
    Mine
    Monitoring
    Open
    Pit
    Slope
    Tilts
Abstract (in english)
   Tilt changes and microtremors were measured in the exploration gallery and on the surface of the slope in the forefield of a deep open pit mine in connection with the slope stability monitoring. pendulum tiltmeters with the resolution limit of 0.5nrad were installed in a free block near the surface and deep in the stable rock mass. Two vertical short-period seismographs in the gallery and on the surface and one horizontal intermediate-period seismography in the gallery and on the surface and one horizontal intermediate-period seismograph with the resolution limits of 0.1 m and 1 m, respectively, were in operation simultaneously. The Earth s tides course on the stable block corresponded to the theoretical one for the given geographical latitude but was about three times greater in amplitude and of an opposite phase in the free block. The non-tidal part of tilt changes contained long-term drift with some seasonal variations.
   In the free block short-term tilt loops with several days duration were accompanied by local tremors which were probably generated by slope failures. Step change of tilt with following intermediate-period seismic noise observed in the free block was excited by seismic loading of usual size induced by quarry blasting
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012