Rock bursting as a surface instability phenomenon

180A 845146 Stability of a rock opening subjected to pulsating temperature Bjurstrom, S; Martna, J; Rehbinder, G; Roshoff, K

Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PEI73-E179. Publ Rotterdam: A. A. Balkema, 1983 In order to study the possibilities of storing heated water underground, a research rock cavern with a volume of 15,000cu m has been built in Sweden. This cavern is filled with hot water and the temperature varies between 40 and 115 deg C. A research programme will simulate the situations of both seasonal heat storage and short term heat storage. In the cavern and in the surrounding rock comprehensive instrumentation has been installed for the registration of, among other things, the stabilization process in the heated rock. This paper describes briefly the geological situation at the site and the selected method to measure the displacement in the heated rock. It also describes the preliminary results of the displacements in the rock due to the initial heating. 845147 Boundary element method for linear visco-elastic stress analysis in a rock mass and its application in rock engineering Lin Dezhang; Liu Baoshen

Proc 5th Congress of the International Society for Rock Mecham'cs, Melbourne, 10-15 April 1983 II2, PF195-F197. Publ Rotterdam: A. A. Balkema, 1983 845148 Applications of a new computer model for reconstructing blocky rock geometry - analysing single block stability and identifying keystones Warburton, P M

Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PF225-F230. Publ Rotterdam: A. A. Balkema, 1983 The paper introduces a new computer model for blocky rock and describes some of its applications. The current program can reconstruct the hidden three-dimensional block structure around a complex excavation, eliminate selected blocks, and analyse the stabilities of individual surface blocks. Detailed perspective views can readily be obtained. Recent theoretical developments permit the analysis of simple systems of interacting blocks and support, including keystone systems. Auth. 845149 Present state and tendencies in the development of rock mechanics in Czechoslovakia (In German) Siska, L

Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PF243-F249. Publ Rotterdam: A. A. Balkema, 1983 845150 Response of a pipeline to nearby deep trenching in boulder clay Carder, D R; Taylor, M E

Transport and Road Research Laboratory report N1099, 1983, 8P An instrumented 100mm diameter cast-iron pipeline was installed at a depth of 0.75m, two months prior to deep trench excavation. It was located parallel to the projected trench and 2.25m from one face. Bending strains up to a maximum of 0.000130 were measured in the pipeline during its installation. During the excavation of the adjacent deep trench, peak bending strains of 0.000070 and pipe settlements and lateral movements, each of about 10ram, were recorded. Measured movements of the pipeline were correlated with those evaluated from strain data using a semi-graphical integration technique.

Mines

See also: 845043, 845213, 845220, 845221, 845222, 845228, 845229, 845234, 845235, 845236, 845239, 845313 845151 Models for strata control and supports dimensioning: successes and present achievements (In German and English) Everling, G

Gluckauf Vl18, N1, 7 Jan 1982, P16-23 (german), P9-12 (english) The Mines Supports and Rock Mechanics Research Station of Bergbau-Forschung GmbH has developed several physical models for strata control since it was set up in 1958. Their first model was a roadway model to determine the stability of roadways with ring supports. In 1960 they developed the face model to examine the problem of heavy falls at faces just started. 845152 Concept and progress at Voerde deep-level freeze shaft (In German and English) Hegemann, J

Gluckauf Vl18, N2, 21 Jan 1982, P76-81 (german), P27-30 (english) Preliminary investigations revealed that the site for the new Voerde deep-level shaft of the Walsum Colliery, Germany, consisted of overburden that was both incompetent and water bearing to a depth of 600m. This meant the shaft could only be sunk successfully by freezing techniques which called for new technological approaches. 845153 Rock bursting as a surface instabifity phenomenon Vardoulakis, I

lnt J Rock Mech Min Sei II21, N3, June 1984, P137-144 Mining cavities often intersect horizontal soft rock or coal strata which then tend to move suddenly into the cavity - ie a rock burst. Rock burst is analysed in this paper as a surface instability of a semi-infinite layer of cohesive-frictional material under plane-strain uniaxial compression. The material behaviour is described by a deformation theory for a rigid-plastic, incompressible material with a Mohr-Coulomb yield criterion. The instability criterion is presented in terms of the strengths of the material in uniaxial extension and compression and a hardening parameter. 845154 Soil mechanics principles in underground mining Blight, G E

J Geotech Engng Div ASCE 11110, NGT5, May 1984, P567581 Soil mechanics principles can be successfully applied to many of the problems encountered in underground mining. A few typical problems are described, and the application of soil mechanics to their solution is indicated. The topics considered include: (1) the design and properties of stifffiU materials for the support of underground excavations; (2) stress distribution within the fill contained by an inclined underground excavation; (3) the design of water retaining underground plugs; and (4) the design of behaviour of steel-reinforced walls of granular material used to provide roof support in shallow coal mines. Auth. 845155 Research mine

Min Mag V150, N2, Feb 1984, P134-138