Ground Support in Mining and Underground Construction: Proceedings of the Fifth International Symposium on Ground

Ernesto Villaescusa, Yves Potvin9058096408, 9789058096401, 9780203023921

The purpose of ground support is to safely maintain excavations for their expected lifespan. The effectiveness of ground support can be seen both in terms of personnel and equipment safety, and in terms of allowing the most economic extraction. Scientists, practitioners and technology developers have contributed to this volume, which covers rock mass characterisation, open pit mining and tunnelling. The methods described include modelling and dynamic testing, while international case studies provide ample illustration of both failures and triumphs in ground support.

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Table of contents :
Book Cover……Page 1
Half-Title……Page 2
Title……Page 4
Copyright……Page 5
Table of Contents……Page 6
Foreword……Page 11
Organization……Page 13
Keynote lectures……Page 15
1 The dynamic environment of ground support and reinforcement……Page 16
2 A review of long, high capacity reinforcing systems used in rock engineering……Page 40
Part I Case studies……Page 84
3 The evolution of ground support practices at Mount Isa Mines……Page 85
4 A case study of ground support improvement at Perseverance Mine……Page 100
5 A fall of ground case study-an improved understanding of the behaviour of a major fault and its interaction with ground support……Page 120
6 Field experiments on cable bolting for the pre-reinforcement of rock masses-first application to an underground powerhouse in Japan……Page 145
7 Seismic and support behaviour, a case study: the April 22nd, 2003 Rockburst, Reservas Norte sector, El Teniente Mine, Codelco Chile……Page 177
8 Integrated ground support design in very weak ground at Cayeli Mine……Page 192
Part II Rock mass characterisation……Page 218
9 Three-dimensional rock mass characterisation for the design of excavations and estimation of ground support requirements……Page 219
10 Geotechnical block modelling at BHP Billiton Cannington Mine……Page 244
11 The application of a rock mass rating system at Tau Lekoa Mine……Page 260
12 Determination of rock mass behaviour as an integral part in rock mass characterisation using probabilistic methods……Page 275
Part III Modelling……Page 303
13 Rock mass characterization for numerical modelling of ground stability control in mining……Page 304
14 Axial force distribution of friction-anchored rockbolts……Page 325
15 A case study on stochastic fracture geometry modeling in 3-D including validations for a tunneling site in USA……Page 351
16 Modelling of rockbolt behavior around tunnels with emphasis on stress distribution on the rockbolt shank……Page 377
Part IV In situ and laboratory testing……Page 393
17 Changing to the Posimix4 resin bolt for Jumbo and Quick-Chem™ at Mt Charlotte mine……Page 394
18 Bolt surface profiles-an important parameter in load transfer capacity appraisal……Page 410
19 Extent and mechanisms of gloving and unmixed resin in fully encapsulated roof bolts and a review of recent developments……Page 430
20 The effect of rock strength on shear behaviour of fully grouted bolts……Page 449
21 Research on new anchoring method by physical modelling and field testing……Page 469
Part V Open pit……Page 485
22 Highly flexible catch fences and high performance drape mesh systems for rockfall protection in open pit operations……Page 486
23 Artificial rehabilitation and control of open pit slope crests and batters……Page 503
Part VI Dynamic testing……Page 523
24 Dynamic capable ground support development and application……Page 524
25 Field performance of cone bolts at Big Bell mine……Page 540
26 Performance assessment of tendon support systems submitted to dynamic loading……Page 562
27 Performance of rockburst support systems in Canadian mines……Page 588
28 Assessing the in-situ performance of ground support systems subjected to dynamic loading……Page 601
29 Dynamic testing of rock reinforcement using the momentum transfer concept……Page 615
30 Simulation and analysis of dynamically loaded reinforcement systems……Page 644
Part VII Rockfalls and failure mechanisms……Page 682
31 Controlling rockfall risks in Australian underground metal mines……Page 683
32 Failure modes and support of coal roofs……Page 698
33 Rockfalls in Western Australian underground metalliferous mines……Page 711
34 Back analysis of block falls in underground panel cave excavations: The experience in panel caving at El Teniente Mine-Codelco Chile……Page 735
35 Quality in ground support management……Page 758
36 Support evaluation and quality assurance for AngloGold Ashanti Limited’s SA region……Page 777
37 Ground support practices at Brunswick Mine, NB, Canada……Page 792
Part VIII Civil engineering and tunnelling……Page 807
38 100-year design life of rock bolts and shotcrete……Page 808
39 Design and construction of water dams against 1000 m hydraulic pressure……Page 819
40 Thermo-chemo-mechanical assessment of support effectiveness during tunneling in squeezing conditions……Page 830
41 Risk-based design using numerical modelling……Page 854
42 Application of nondestmctive stress measurement technique for safety assessment of underground structures……Page 865
43 Support performance control in large underground caverns using instrumentation and field monitoring……Page 885
44 Rock mass classifications and complementary analyses of use in tunnel design……Page 896
Part IX Design……Page 916
45 Rock reinforcement design for overstressed rock using three dimensional numerical modeling……Page 917
46 Issues in selection and design of ore pass support……Page 930
47 Ground support-predicting when to change the pattern……Page 942
Part X Corrosion……Page 963
48 Premature bolt failures in Australian coal mines due to stress corrosion cracking……Page 964
49 The corrosion of rock bolts and cable bolts……Page 987
50 Corrosion assessment of ground support systems……Page 1004
Part XI Surface support……Page 1029
51 Hydro scaling and in-cycle shotcrete at Waroonga mine, Western Australia……Page 1030
52 Strength and stiffness of shotcrete-rock interface-a laboratory study……Page 1050
53 Investigations into mechanisms of rock support provided by sprayed liners……Page 1073
54 Large scale static laboratory tests of different support systems……Page 1083
55 The use of cementitious linings to protect ore passes in the mining industry……Page 1098
56 Performance assessment of high-tensile steel wire mesh for ground support under seismic conditions……Page 1121
Part XII Other support……Page 1135
57 Pillar replacement using pre-stressed timber props……Page 1136
58 A probabilistic approach to determining stable inter-pillar spans on Tau Lekoa Mine……Page 1145
59 Backfill at Sons of Gwalia Mine……Page 1167
60 Measurement and prediction of internal stresses in an underground opening during its filling with cemented fill……Page 1179
61 Mining and support of tunnels in minefill at BHP Billiton Cannington Mine……Page 1206
62 An overview on the use of paste backfill technology as a ground support method in cut-and-fill mines……Page 1220
63 Raise climber-supporting method for stability of raise development in Pongkor Gold Mine, Indonesia……Page 1251
Author Index……Page 1267