Pavel Blaha - Academia.edu (original) (raw)
Papers by Pavel Blaha
Acta Polytechnica CTU Proceedings, Dec 13, 2023
Tomography is a new method for processing the data obtained by radiography. Tomography has gradua... more Tomography is a new method for processing the data obtained by radiography. Tomography has gradually found its way into the processing of geophysical measurements. The first tomographic applications were made for the processing of seismic measurements.
Górnictwo i Geologia, 2007
Seismic processing begins to appear as a new method not only in the applied geophysics of great d... more Seismic processing begins to appear as a new method not only in the applied geophysics of great depth but even in geophysics in civil engineering, hydrogeology and environment. The application of seismic tomography in civil engineering investigation is described. This task was done for PC computers. The main ideas of mathematical and software solution are given. The obtained solutions enable not only the tomography processing of crosshole measurements but it is possible to model various geological situations. Examples of crossgalleries processing and results from extending seismic logging are given. These types of measurements are the most common in civil engineering investigation. There is one example from the noninline measurement too. The results of described solution is not only the velocity contour line map but even the map with seismic curved rays among shot points and receivers.
BULLETIN DE L'ASSOCIATION INTERNATIONALE DE GEOLOGIE DE L'INGENIEUR, Dec 1, 1977
Geofyzikálny monitoring ako zdroj informácií o chovaní horninového masívu Geofyzikálne prieskumné... more Geofyzikálny monitoring ako zdroj informácií o chovaní horninového masívu Geofyzikálne prieskumné metódy prinášajú informácie o horninovom prostredí v reálnom čase, tzn. už v priebehu geofyzikálneho prieskumu. Geológ alebo geotechnik takto získané informácie poskytuje projektantovi za účelom projekčných a realizačných prác na stavbách. Veľmi významné sú taktiež informácie o vplyve horninového prostredia, respektíve jeho (v čase sa meniacich) vlastností na stabilizačné práce. Opakované geofyzikálne merania (gravimetrické, magnetometrické, seizmické, geoelektrické, rádiometrické a karotážne) poskytujú potrebné informácie o horninovom prostredí od okamihu uskutočnenia merania buď periodicky alebo spojito. V príspevku prezentujeme niektoré naše skúsenosti nadobudnuté počas opakovaných meraní.
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1992
Sborník vědeckých prací VŠB–TU Ostrava, řada stavební, 2007
Abstract Classical observation of surface deformation in undermined territories use repeated geo... more Abstract
Classical observation of surface deformation in undermined territories use repeated geodetic surveying. Results from these surveying do not offer data about physical changes that happen in the rock massif. To find out these changes, a complex of repeated geodetic and geophysical measurements of surface, borehole and surface-borehole system was used from 2002 to 2006. These measurements pointed out (beside the well known surface deformations) also that the changes inside the rock massif
do not affect the massif as whole, but the “faulty zones” are formed there.
Classical observation of surface deformation in undermined territories use repeated geodetic surv... more Classical observation of surface deformation in undermined territories use repeated geodetic surveying. Results from these surveying do not offer data about physical changes that happen in the rock massif. To find out these changes, a complex of repeated geodetic and geophysical measurements of surface, borehole and surface-borehole system was used from 2002 to 2006. These measurements pointed out (beside the well known surface deformations) also that the changes inside the rock massif do not affect the massif as whole, but the “faulty zones” are formed there
V současnosti geotechnici často požadují po geofyzicích informace o geotechnických vlastnostech z... more V současnosti geotechnici často požadují po geofyzicích informace o geotechnických vlastnostech zkoumaných materiálů, a to především pro matematické modelování. Geotechnici využívají buď tabulkové hodnoty nebo hodnoty získané z malého počtu laboratorních nebo terénních testů. Příspěvek shrnuje naše poznatky ze získávání požadovaných geotechnických vlastností a jejich využitelnosti z geofyzikálních měení.
The logging for engineering geology and hydrogeology doesn't belong to the sporadic applications ... more The logging for engineering geology and hydrogeology doesn't belong to the sporadic applications of measurements in boreholes. We are sorry to state that a number of measured boreholes decreased after 1990s. In the last years a number of logged holes has a little increased again but it still hasn't reached the volume of the end of the eighties. The logging on the purpose of giving precision to the lithology and for the assessment of hydrogeological parameters is quite usual. The measurements in the cased holes are not routine programme and they cannot be considered as a systematic access. Nevertheless, such measurements bring a number of valuable pieces of information. Such loggings sometimes are realized intentionally; sometimes the measurements in cased boreholes bring results that surprise not only geophysicists but also geologists and drilling technicians. We can show you some examples of both types of measurements.
This work describes the first extensive results of the shape and frequence investigations of the ... more This work describes the first extensive results of the shape and frequence investigations of the natural electromagnetic waves measured at slope deformations in greater detail. The results of this study have shown that the large part of the investigated field is created by the components that don’t belong to natural fields according to the classical geophysical dividing. In fact they are spurious signals due to the associated effects connected with the broadcast of various types of the anthropogenic electromagnetic signals. The authors of this paper have succeeded in discovering signals that can’t be unambiguously reported to be the responses of man-made electromagnetic fields
This work describes the first extensive results of the shape and frequence investigations of the ... more This work describes the first extensive results of the shape and frequence investigations of the natural electromagnetic waves measured at slope deformations in greater detail. The results of this study have shown that the large part of the investigated field is created by the components that don’t belong to natural fields according to the classical geophysical dividing. In fact they are spurious signals due to the associated effects connected with the broadcast of various types of the anthropogenic electromagnetic signals. The authors of this paper have succeeded in discovering signals that can’t be unambiguously reported to be the responses of man-made electromagnetic fields.
Pavel Bláha Abstract: Landslides and slope deformations continually const itute a risk for the ma... more Pavel Bláha Abstract: Landslides and slope deformations continually const itute a risk for the mankind. It is necessary for us to gain a lot of knowledge before starting the l andslide stabilization. This information can be gained not only in classical ways of prospecting bu t also in using geophysical methods, which have widely been introduced during the last two decades. How to use geophysical methods both during the stage of geological prospecting and in the stag e of monitoring will be shown. These demonstrations will be presented on the case histor y of a landslide from its orientation survey over the detailed investigation, stabilization works and monitoring to its following behaviour after the stabilization works.
Acta Polytechnica CTU Proceedings, Dec 13, 2023
Tomography is a new method for processing the data obtained by radiography. Tomography has gradua... more Tomography is a new method for processing the data obtained by radiography. Tomography has gradually found its way into the processing of geophysical measurements. The first tomographic applications were made for the processing of seismic measurements.
Górnictwo i Geologia, 2007
Seismic processing begins to appear as a new method not only in the applied geophysics of great d... more Seismic processing begins to appear as a new method not only in the applied geophysics of great depth but even in geophysics in civil engineering, hydrogeology and environment. The application of seismic tomography in civil engineering investigation is described. This task was done for PC computers. The main ideas of mathematical and software solution are given. The obtained solutions enable not only the tomography processing of crosshole measurements but it is possible to model various geological situations. Examples of crossgalleries processing and results from extending seismic logging are given. These types of measurements are the most common in civil engineering investigation. There is one example from the noninline measurement too. The results of described solution is not only the velocity contour line map but even the map with seismic curved rays among shot points and receivers.
BULLETIN DE L'ASSOCIATION INTERNATIONALE DE GEOLOGIE DE L'INGENIEUR, Dec 1, 1977
Geofyzikálny monitoring ako zdroj informácií o chovaní horninového masívu Geofyzikálne prieskumné... more Geofyzikálny monitoring ako zdroj informácií o chovaní horninového masívu Geofyzikálne prieskumné metódy prinášajú informácie o horninovom prostredí v reálnom čase, tzn. už v priebehu geofyzikálneho prieskumu. Geológ alebo geotechnik takto získané informácie poskytuje projektantovi za účelom projekčných a realizačných prác na stavbách. Veľmi významné sú taktiež informácie o vplyve horninového prostredia, respektíve jeho (v čase sa meniacich) vlastností na stabilizačné práce. Opakované geofyzikálne merania (gravimetrické, magnetometrické, seizmické, geoelektrické, rádiometrické a karotážne) poskytujú potrebné informácie o horninovom prostredí od okamihu uskutočnenia merania buď periodicky alebo spojito. V príspevku prezentujeme niektoré naše skúsenosti nadobudnuté počas opakovaných meraní.
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1992
Sborník vědeckých prací VŠB–TU Ostrava, řada stavební, 2007
Abstract Classical observation of surface deformation in undermined territories use repeated geo... more Abstract
Classical observation of surface deformation in undermined territories use repeated geodetic surveying. Results from these surveying do not offer data about physical changes that happen in the rock massif. To find out these changes, a complex of repeated geodetic and geophysical measurements of surface, borehole and surface-borehole system was used from 2002 to 2006. These measurements pointed out (beside the well known surface deformations) also that the changes inside the rock massif
do not affect the massif as whole, but the “faulty zones” are formed there.
Classical observation of surface deformation in undermined territories use repeated geodetic surv... more Classical observation of surface deformation in undermined territories use repeated geodetic surveying. Results from these surveying do not offer data about physical changes that happen in the rock massif. To find out these changes, a complex of repeated geodetic and geophysical measurements of surface, borehole and surface-borehole system was used from 2002 to 2006. These measurements pointed out (beside the well known surface deformations) also that the changes inside the rock massif do not affect the massif as whole, but the “faulty zones” are formed there
V současnosti geotechnici často požadují po geofyzicích informace o geotechnických vlastnostech z... more V současnosti geotechnici často požadují po geofyzicích informace o geotechnických vlastnostech zkoumaných materiálů, a to především pro matematické modelování. Geotechnici využívají buď tabulkové hodnoty nebo hodnoty získané z malého počtu laboratorních nebo terénních testů. Příspěvek shrnuje naše poznatky ze získávání požadovaných geotechnických vlastností a jejich využitelnosti z geofyzikálních měení.
The logging for engineering geology and hydrogeology doesn't belong to the sporadic applications ... more The logging for engineering geology and hydrogeology doesn't belong to the sporadic applications of measurements in boreholes. We are sorry to state that a number of measured boreholes decreased after 1990s. In the last years a number of logged holes has a little increased again but it still hasn't reached the volume of the end of the eighties. The logging on the purpose of giving precision to the lithology and for the assessment of hydrogeological parameters is quite usual. The measurements in the cased holes are not routine programme and they cannot be considered as a systematic access. Nevertheless, such measurements bring a number of valuable pieces of information. Such loggings sometimes are realized intentionally; sometimes the measurements in cased boreholes bring results that surprise not only geophysicists but also geologists and drilling technicians. We can show you some examples of both types of measurements.
This work describes the first extensive results of the shape and frequence investigations of the ... more This work describes the first extensive results of the shape and frequence investigations of the natural electromagnetic waves measured at slope deformations in greater detail. The results of this study have shown that the large part of the investigated field is created by the components that don’t belong to natural fields according to the classical geophysical dividing. In fact they are spurious signals due to the associated effects connected with the broadcast of various types of the anthropogenic electromagnetic signals. The authors of this paper have succeeded in discovering signals that can’t be unambiguously reported to be the responses of man-made electromagnetic fields
This work describes the first extensive results of the shape and frequence investigations of the ... more This work describes the first extensive results of the shape and frequence investigations of the natural electromagnetic waves measured at slope deformations in greater detail. The results of this study have shown that the large part of the investigated field is created by the components that don’t belong to natural fields according to the classical geophysical dividing. In fact they are spurious signals due to the associated effects connected with the broadcast of various types of the anthropogenic electromagnetic signals. The authors of this paper have succeeded in discovering signals that can’t be unambiguously reported to be the responses of man-made electromagnetic fields.
Pavel Bláha Abstract: Landslides and slope deformations continually const itute a risk for the ma... more Pavel Bláha Abstract: Landslides and slope deformations continually const itute a risk for the mankind. It is necessary for us to gain a lot of knowledge before starting the l andslide stabilization. This information can be gained not only in classical ways of prospecting bu t also in using geophysical methods, which have widely been introduced during the last two decades. How to use geophysical methods both during the stage of geological prospecting and in the stag e of monitoring will be shown. These demonstrations will be presented on the case histor y of a landslide from its orientation survey over the detailed investigation, stabilization works and monitoring to its following behaviour after the stabilization works.