Description
An important objective of the civil and mining engineer concerned with structures in rock such as tunnels, open pits, dam foundations and so forth is the creation of a safe and efficient design. This necessitates an estimate of the immediate and long-term performance of the surface or subsurface opening or foundation, whichever the case may be. This in turn requires a quantitative estimate of those physical and mechanical properties of the rock mass which govern its strength, permeability and deformation charac teristics. To a lesser or greater extent, depending upon the type of engineer ing structure considered, these properties are a function of the 1) attitude, 2) geometry and 3) spatial distribution of the joints and other discontinuities in the mass. All three factors can be determined, since the joints are detect able features whose characteristics can be quantitatively measured and described. Joints are universally present in rock masses and have strength, per meability and deformational characteristics appreciably different from those of the intact rock. Depending upon the origin of the joints sets, their characteristics can vary greatly. Not only can the average spacing between joints vary within wide limits, but the nature and degree of joint infilling material, physical characteristics of their planes and their degree of develop ment can be vastly different. Because of variations in these properties one joint set can have very different effects than another on, for example, shear characteristics. Hence, each joint set should be examined individually for its properties. Index / Inhaltsverzeichnis / Table des matires.- Erffnungsworte des Vorsitzenden der sterreichischen Gesellschaft fr Geomechanik.- Characterizing and Extrapolating Rock Joint Properties in Engineering Practice / Ingenieurgeologische Kennzeichnung und Extrapolation von Klufteigenschaften / Comment caractriser et extrapoler pour l’ingnieur les proprits des roches fissures.- The Load-Deformation Behaviour of Rock in Uniaxial Compression / Das Belastungs-Verformungs-Verhalten von Gestein unter monoaxialem Druck / Relation entre la charge et la dformation des rockes soumises une compression monoaxiale.- Ermittlung eines einfachen Kennwertes zur Bestimmung der Restscherfestigkeit von Gesteinstrennflchen / Investigation of a Simple Index Value for the Residual Shear Strength of Discontinuities in Rock / Reprsentation par un indice unique de la rsistance au cisaillement rsiduelle des discontinuits des roches.- Kriterien zur Erkennung der Bruchgefahr geklfteter Medien – Ein Versuch / Determination of the Criterion of Failure of Jointed Media – An Attempt / Recherche de critres pour reconnatre le danger de rupture dans les milieux fissurs.- Microseismic Techniques – Basic and Applied Research / Mikroseismische Methoden – Grundlegende und angewandte Forschung / Techniques microsismiques – recherche thorique applique.- Felsdynamische Untersuchungsmethoden in der Baupraxis / Methods of Rock-Dynamical Investigations in the Field of Construction Engineering / Mthodes dynamiques d’tude des roches dans la pratique de la construction.- ber gebirgsmechanische Entwicklungen im Bergbau / Rock Mechanics Developments in Mining / Dveloppements de la mcanique des roches dans l’exploitation des mines.- Triaxiale Felsversuche in situ und ihre Verwendung fr die Stabilittsberechnung von Staumauerwiderlagern / Triaxial in situ Rock Tests and Their Interpretation for Stability Calculation of Dam Abutments / Essais triaxiaux dans la roche en place et leur interprtation en vue du calcul de stabilit des appuis de barrage.- Bogengewichtsmauer Schlegeis. Das Verhalten des Felsuntergrundes whrend der ersten beiden Teilstauperioden / Schlegeis Arch Dam. The Behaviour of the Rock Foundation During the First Two Periods of Storage / Barrage-vote de Schlegeis. Le comportement de la fondation rocheuse pendant les deux premires priodes de remplissage partiel.- Theorie und Praxis bei den Untertagearbeiten eines groen Dammbauvorhabens / Theory and Practice at the Underground Works of a Large Dam Project / Thorie et pratique des travaux en souterrain dans le projet d’un grand barrage.- Praktische Beispiele empirischer Dimensionierung von Tunneln / Practical Examples of Empirical Dimensioning of Tunnels / Exemples pratiques de dimensionnement empirique des tunnels.- Die Neue sterreichische Tunnelbauweise beim U-Bahnbau in Frankfurt am Main / The New Austrian Tunnelling Method Applied for the Frankfurt Subway Construction / La “nouvelle mthode autrichienne de construction de tunnel” applique au mtro de Frankfurt/Main.- Schildvorgetriebene Tunnel – Entwicklungstendenzen in Forschung und Ausfhrung / Shield Tunnelling – Development Trends in Research and Construction / Construction de tunnels l’aide de boucliers – Tendances d’evolution dans la recherche et l’application.- Zur Bemessung von Tunnelauskleidungen in wenig festem Gebirge / Dimensioning of Tunnel Linings in Rock Masses of Low Strength / Dimensionnement du revtement des tunnels dans les roches peu rsistantes.- Ein Kavernenbau mit Ankerung und Spritzbeton unter Bercksichtigung der geomechanischen Bedingungen / The Construction of an Underground Chamber with Geomechanical Conditions Taken into Consideration / La ralisation d’une caverne en tenant compte des conditions gomcaniques.- Discussions / Diskussionen / Discussions.
