Der Arbeitskreis AK 3.3 “Versuchstechnik Fels” der Deutschen Gesellschaft für Geotechnik e. V. erarbeitet Empfehlungen für felsmechanische Laborversuche und Feldversuche sowie Messungen im Gebirge und an Bauwerken. Die vorliegende Neufassung der Empfehlung Nr. 1 behandelt den einaxialen Druckversuch an Gesteinsprüfkörpern und berücksichtigt die Weiterentwicklungen der Prüfmaschinen‐ und Versuchstechnik seit der gleichnamigen Empfehlung Nr. 1 von 1979. Es werden die Anforderungen an die Prüfeinrichtung und die Prüfkörper sowie die Vorgehensweisen für die Durchführung und Auswertung von einaxialen Druckversuchen festgelegt. Wesentliche Neuerungen bestehen in Optionen, die es ermöglichen, das Verformungsverhalten im Vorbruch‐Bereich in reversible (elastische) und irreversible (anelastische) Anteile zu trennen und das Nachbruch‐Verhalten zu erfassen. Die häufigsten Anwendungsfälle werden mit 12 Standard‐Versuchsoptionen abgedeckt.
In the framework of the Integrated Water Resources Management (IWRM) joint research project in the karst area of Gunung Kidul, Province of Yogyakarta Special Region on the Java Island, Indonesia, an underground hydropower driven water extraction facility in the cave ''Bribin'' was developed using pump-as-turbine-driven systems for freshwater supply of the rural area. As numerous other caves in the Gunung Kidul area, Bribin is part of a ramified system of all-season water-bearing subterraneous rivers and natural caves in karstic limestone. The elliptic cross section of the cave was completely closed with a concrete barrage, thus creating a year-round underground retention volume with an operational storage level of approx. 15 m. This contribution highlights the geotechnical and geohydraulic challenges handled within the sub-project ''Short-time and long-time behaviour of karst rock surrounding pressure-bearing underground water-retaining structures''. One key to the feasibility of an artificial water retention scheme in a natural cave is to ensure the mechanical stability of the cave roof and sidewalls. The necessary geotechnical investigations are described. Another key to the effectiveness of such a water retention concept is the control and minimization of ''lost'' seepage water bypassing the barrage structure through the karst rock mass. Measures to monitor and to explain the seepage phenomena are presented as well as grouting efforts to minimize them. The limitations of improving the overall tightness will be discussed. Interpretation includes the use of analytical and numerical methods.
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