Computers — an everyday geotechnical tool?

242A 876211 Long-term performance of rod extensometers in monitoring the deformation of a large underground test room at the University of Minnesota Sterling, R; Park, Y; Nelson, C

Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2, P1025-1038. Publ Oxfor& Pergamon Press, 1986 A 15rn by 30m by 2.6m high test room was excavated in soft sandstone beneath a near-surface bedded limestone formation. Rod extensometers were installed from the ground surface two years prior to excavation, and extensomers and a comprehensive monitoring system were installed from pilot drifts one year before the main investigation. The performance of the extensometers in monitoring test room movements over ten years is discussed, and the value of surface instrumentation and of data readings prior to the main data capture period is emphasised. 876212 Instrumentation in Minhgu underground power cavern construction Wang. S C; Li, J C; Ueng, Z S; Chang, K T

Proc International Symposimn on Large Rock Caverns, Helsinki, 25-28 August 1986 II2, P1063-1072. Publ Oxford: Pergamon Press. 1986 The powerhouse of the Minhgu pumped storage project, Taiwan, was excavated in layered sandstone and sihstone. A comprehensive monitoring system, installed during construction, allowed the behaviour of the concrete roof arch, the prestressed anchors in the walls, and ground movement to be followed during and after construction, thus permitting potential problems to be identified and remedial measures taken. Finite element analysis predicted the development of tensile zones around the cavern during excavation, and the monitoring system recorded such behaviour.

Analysis Techniques and Design Methods See also." 876026. 876105. 876109 876215 Hardware and software for computer applications in geotechnics Smith, I M

Proc Symposium on Computer Applications in Geotechnical Engineering, Birmingham, April 1986 PI-24. Publ Birmingham: Midlands Geotechnicat Society. 1986 Hardware suitable for meaningful geotechnical calculations can cost from about £1000 to £millions. The available hardware range is reviewed in relation to types of problems to be solved and available software. Hardware developments are discussed. Examples of 'cheap' and 'expensive' calculations of practical importance, slope stability, embankment design, and analysis of a hydraulically filled caisson, are briefly described: 876216 Computers - an everyday geotechnical tool? Holehouse, R C

Proc Symposium on Computer Applications in Geotecimical Engineering, Birmingkam, April ~ P25,35. Publ Birmingham: Midlands Geotechnical Society, 1986 The selection of computer hardware and software for routine use by geotechnicat engineers, even those without particular computer knowledge, is discussed. A specific, easy to use suite of programs concerned with slope stability is described.

Rock block analysis See also." 876380

876213 Monitoring reinforced rock mass performance Windsor, C R; Worotnicki, G

Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2, P1087-1098. Publ Oxford: Pergamon Press, 1986 New and improved instruments have been developed to monitor rock stresses and strains, movement on discontinuities, and rock reinforcement loads and deformation. These instruments use electrical resistance wires as strain transducers. The capabilities of the instruments are demonstrated using field data from large underground excavations, stressed crown pillars and banging wall cable dowels. 876214 Application o f AE techniques to prediction of rock failure Li Dianwen; Du Zengiin

Proc International Symposium on ~iavering in Con~plex Rock Formations, Bdfing, 3.7 November. 1986 P247-25Z Publ Beijing: Science Press, 1986 Two portable AE monitoring devices are briefly described. Results of previous laboratory and field work are discussed, and general rules for field application established. It is indicated that failure is generally preceded by a marked increase in AE activity. However in a minority of cases the increase is not followed by failure, or failure happens without warning. AE can be used effectively in conjunction with other methods. Results of field applications in underground and surface mines are shown.

876217 Field cases using key block theory Boyle, W J; Goodman, R E; Yow, J L

Proc International Symposilan on Large Rock Caverns. Helsinki, 25-28 August 1986 V2, Pi183-1199. Publ Oxford: Pergamon Press, 1986 Block theory is used to identify and describe the most critical rock blocks formed by the intersection of the joints and a specific underground excavation. Key blocks - the most Critical blocks - are analysed taking into account the effects of field stresses and dilatancy in the block faces, Cases histories dem, onstrate that field stresses can stabilise blocks which would otherwise fail, and destressing can allow the block tO fall:.

Stress analysis See also." 876002 876218 Simple pcocedure for computation o f v e ~

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Thompson, J C; Lelievre, B~ ~ k i e , R D; Negus; K J

Can Geateeh J V24, NI, Feb 1987, P143-145 Exact formulae for vertical stresses beneath the corner of an arbitrarily s h a ~ triangular surface region subjected to vertical pressure with uniform, linear or quadratic distribution have been developed, based onthe Boussinesq formula. From

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