Understanding deformations in tunnels

Understanding deformations in tunnels

UNDERGROUND EXCAVATIONS:MINES VIII Australian tunnelling conference: 'finding common ground', Sydney, New S o u t h Wales, August 1993 943375 ed ANO...

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VIII Australian tunnelling conference: 'finding common ground', Sydney, New S o u t h Wales, August 1993 943375

ed ANON, (Australasian Institute of Mining & Metallurgy, Parkvllle, Victoria; Publication Series, 6/93), ISBN (paperback) 0 9491 0691 7, 1993, 288 pp. For this conference, The Australian Underground Constructien and Tunnelling Association (AUCTA) organised and collated technical papers and presentations which explore the areas of common interest between the underground mining and construction industries. The papers presented in this volume highlight some of the 'common ground' in many areas: rapid excavation technology; ground support methodology and systems; major construedon sequencing and programming; and corporate issues of finance and risk management. -after Editors 943376 Rock mechanics in the 1990s: rock mechanics in tunneling ed B. C. Haimson, International Journal of Rock Mechanics and Mining Sciences, 30(7), 1993, pp 1449-1501. These papers were originally presented at the 34th US Symposium on Rock Mechanics, June 1993. Nine papers examine various aspects of tunnening including: tunnel portals in weathered rock; time dependant behaviour in tunnels in porous rock; tunnelling in soft rock; design and construction of a wide tunnel under shallow cover; and deformation modes and failure in lined tunnels. -R.Gower 943377 Understanding deformations in tunnels M. Panet, in: Comprehensive rock engineering. Vol. 1, ed J.A. Hudson, (Pergamon), 1993, pp 663-690. Modem tunnelling techniques monitor displacements during and following tunnel construction. The measurement of wall displacement - convergence - and models used in rock tunnel engineering are discussed. The deformations caused by tunnels driven into elastic, and yielding rock masses are artalysed, and the chapter is concluded by an examination o t time dependant deformations. -R.Gower 943378 EPB shield tunneling in mixed face conditions G. W. Clough & E. Leca, Journal of Geotechnical Engineering - ASCE, 119(10), 1993, pp 1640-1656. The earth pressure balance (EPB) shield has proven to be successful for tunneling in soft ground in homogeneous soils. On three recent soft ground tunneling projects in Washington, DC, EPB shields were used in mixed ground conditions with a high water table. Many areas were found with sands in the crown, and clays in the invert. In a lirafled number of cases, silicate grouting was used in the sands as a measure to provide extra control for ground movements. Ground conditions were found to play a major role in the observed response. -f~om Authors 943379 Determination of the 'design block' for tunnel s u p p o r t s in highly jointed rock Y. Hatzor & R. E. Goodman, in: Comprehensive rock engineering. Vol. 2, ed LA. Hudson, (Pergamon), 1993, pp 263-292. This chapter describes the particular procedures used to determine and describe the critical blocks for a given free face. The input data axe the data on orientation for the major discontinuities, their distributions of snacin~ and their frictional resistance. After explaining th~ anal"yfical procedure, predictions axe made with the actual block movements described for a tunnel driven through a discontmuous rock mass. The excavation is followed in all of its phases, beginning with a study of the geological exploration data, through a careful observation of block failures in a complete pilot tunnel and finally with an investigation of the fun size excavation. -from Authors 943380 F u n d a m e n t a l s of mine roadway support design: r o c k - s u p p o r t interaction analysis H. Filcek & M. A. Kwasniewski, in: Comprehensive rock engineering. Vol. 2, ed J.A. Hudson, (Pergamon), 1993, pp 671-699. An analysis is made of the mechanism of interaction between the supports for underground roadways and the


surrounding rocks, assuming that the rock mass behaves in a viscoelastic or elasto-plastic manner. Such an analysis should always be the starting point for the design or selection of a support for a particular set of ~eotechnical conditions. Formulae permitting the calculation of the displacement of the excavation periphery with and without a support, as well as the pressure exerted by the surrounding rocks on the support of a given mechanical characteristic are given. Many important conclusions and practical recommendations arise from these formulae. The fulfillment of these and other requirements, are presented in detail and are necessary in order to create statable conditions for the cooperation of a support with a rock mass and so in effectprovide stability for the excavation during the whole p e r i o d o f its use. -from Authors

Power plants 943381 Design of pressure tunnels and shafts T. L. Brekke & B. D. Ripley, in: Comprehensive rock engineering. Vol. 2, ed J.A. Hudson, (Pergamon), 1993, pp 349-369. Design of pressure tunnels and shafts needs to be optimised for efficiency in operation. Leakage assessment must be carried out to ensure confinement within waterways, and the prevention of hydraulic jacking. The stability of adjacent slopes must also be considered. Tunnels, shafts and surge facilities are discussed in terms of layout, before detailed considerations on design such as head loss, flow velocity, and Lining techniques (eg shotcrete) to prevent internal loss are presented. -R.Gower

Mines 943382 International mining geology conference, Kalgoorlie-Boulder, WA, July 1993 ed I. Robertson, W. Shaw, C. Arnold & K. Lines, (Australasian Institute of Mining & Metallurgy, Parkville, victoria; Publication Series, 5/93), ISBN (hardback) 0 949 10689 5, 1993, 346 pp. This conference discussed a wide range of disciplines necessary to good mining geology, from near mine exploration through mine evaluation, three-dimensional modelling and the mining phase to metallurgical and environmental issues, geotechnics, hydrogeology, and the licafions of new technology. There are 41 papers cud in 9 sections based on these topics. The hydrogeology section contains three papers: pit dewatering in anisotropic and deeply weathered rock at the Boddington Gold mine:Western Australia; dewatering open pit mines, Yilgum ~raton, WA; and underground aquifer dewatering and water handling within the stratiform Zn-Pb-Ag orebody at the Hilton mine, Mount Isa, NW Queensland. -after Editors


943383 Applications of finite element analysis to mining engineering W . G . Pariseau, in: Comprehensive rock engineering. Vol. 1, ed J.A. Hudson, (Pergamon), 1993, pp 491-522. Im]~le.mentafion of a finite element analysis begins with the deunidon of analysis objectives. The second step consists of defining and collecting the requisite input data and then translating the information into a run stream suitable for Om..l?uter processing by the program and computational .cilnies at. hand. Desk top computers are capable of hang meumm size, two-dimensional analyses and small sxze three-dimensional analyses. Most programs are written in Fortran, and immediate output is usually in the form of files containing element stresses and strains and node displacements. Evaluation of analysis output for engineering purposes and the conclusions to be made is the next step .and is illustrated with examples taken from actual cases revolving surface and underground mine excavations. -from Author 943384 Stress analysis in mine design L L. Meek, in: Comprehensive rock engineering. Vol. 2, ed J.A. Hudson, (Pergamon), 1993, pp 529-546. This chapter gives various methods for estimation of stress