Boundary element methods for modelling development of tabular orebodies and its application to mine design (In Chinese)

122A 863353 N663 stope experiment on Mount isu Mine Greenelsh. R W Int J .Win Engng V3. N3. Oct 1985, P183-194 Factors affecting the stability of a trial open stope at a depth of 1000m in fissile foot wall and hanging wall shales are discussed. A combination of systematic support using cable dowels. and reduced disturbance from blasting using low density explosives and single ring firing, allowed successful completion of the stope. This trial stope was a success from the points of ~iew of both production and research, demonstrating the use of the open stoping method to mine deep orebodies in weak shale, provided that a full appreciation of the rock mechanics factors is taken into account in the design and in the actual mining operation. 863354 Mount Isa Mine and the Hilton Project ,Win ,Stag Nov 1985, P421-433 The Mount lsa Mine, Queensland, Australia. is one of the largest underground mine complexes. The silver-lead-zinc and copper orebodies are mined by cut and fill or sub-level open stoping, depending on geological features. The mining methods employed, underground equipment used and mineral processing are described. Possibilities of development of the Hilton Mine. as Mount lsa depletes, are considered. 863355 Preparation of mine fill material from coal washplant reject Thomas. E O ,Win Sci Technol I/3, NI. Oct 1985, PI-9 The main benefits envisaged from use of fill in coal mining operations are listed and briefly discussed. A possible plant flowsheet for preparation of fill from coal washplant reject is presented, together with discussion of the problems inherent in the suggested system. Finally,a preliminary laboratory test programme aimed at preparation of a suitable fill material from a typical fine coal washplant reject is described. 863356 Boundary element methods for modelling development of tabular orebndies and its application to mine design (In Chinese) Zhou, J; Dai, Q Nonferr ~Wet V37, N4, Noc 1985, PI-7 The concept of quadrupole singularities was extended to the direct boundary integral method to model development of tabular orebodies. Two versions of the boundary element method suitable for the analysis of mining layouts in a tabular orebody were developed. Computer programs were developed in Fortran. Results compared well with those from analytical solutions. 863357 Monitoring the effect of massive sandstone roof in a Iongwall operation at West Cliff Colliery, New South Wales Lama, R D; Blackwood, R L; Hebblewhite, B K; Bhattacharyya, A K; Fowler, J C W; Pattinaja, M A; Senevirame, P Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 ~lay 1984 I/2. P654-660. Publ Barton: [nst of Engineers. 1984 Results of monitoring the first Iongwall at West Cliff Colliery, ,Australia. are presented. The aim was to establish the stability of the gate roadways and the intervening pillars, overlain by a massive sandstone roof. as input data for future Iongwall

operations at the collier~. Results si~o',~,'d tha" :.ac s~zc ,.,~ .tic pillars is adequate and that convergence of the roadv.a?~ ~< within acceptable le',els. Excessive !oading occurred in (ourway roadv, ay intersections and in fu:ure these will be ei;rn~hated. It was shown that the root behav~our in the goat i~ greatly influenced by the joint s?stem in the sandstone, leadin~ to asymmetrical failure of the goal behind the f~,ce. 863358 Stress monitoring during secondary extraction in 8 North Panel, Laleham No 1 Colliery, South Biackwater. Queensland Wardle, L J; McNabb, K E CSIRO Division of Applied Mechanics report ,V60. Sept I985. 14P Three stress meters and two telescopic com, ergence rods ~ere installed in a pillar in the 8 North Pane[ and monitored during extraction by typical split and lift sequence. Results indicate that a pillar in the extraction area only experiences high stress for a short period, during the extraction of the preceding and given pillars. The coal exhibits yielding behaviour during this period. Local conditions remained relatively stable during pillar extraction. Initial goaf falls did not result in significant stress transfer, suggesting that the falls involve only the immediate roof. Avail: CSIRO Division of Applied Geomechanics, PO Box 54, Mt Waverley. Vic 3149. Australia

General underground storage See." 863159

Radioactive waste disposal See also: 863062, 863063, 863079 863359 Rock support for nuclear waste repositories Abramson, L W; Schmidt, B

In: Rock Mechanics in Productivity and Protection (Proceedings of the Twemty-Fiflh Symposium o n Rock Mechanics, Ewmston, Illinois, 25-27 Jmte 1984) P1103-1114. Publ New York: AIME, 1984 Underground nuclear waste repositories have special constructional and operational requirements, and support used must withstand adverse environmental conditions. The various stages of repository development, environment, environmental effects on support material and alternative support systems are discussed. 86336O Geomechantcs characterization of a proposed nuclear waste repository site in basalt Kim, K; McCabe, W M

In: Rock Meck~ics in Prodau:tieity and Protection ( Procecd~s of eke Twent.v-Fifll#Sympolhun on Rock Mec&mics, El~vmston, lUimais, 25-27 June 1984) Pl126-1135. Publ New York: A[ME, 1984 The site characterisation data required are described. Complete geological information, rock mechanical, jointing, thermal and thermomechanical properties and convergence data for supported and unsupported openings in the rock are necessary. The Handford site, Washington, USA. is examined according to the above criteria.

~ 1986 Pergamon Press Ltd. Reproduction not permitted