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UNSTABLE ROCK AND ITS TREATMENT SNOWY MOUNTAINS SCHEME

4. Where the rock mass has some well defined planar weak structure the bolting pattern should be oriented to take the weakness into account. For example bolts would be oriented normal to weak bedding plane or slabby joints forming the wall of an excavation. In most other cases, for example, where three sets of joints occur, dividing the rock mass into blocks, it is best to adopt a regular pattern, ignoring local variations in jointing, with bolts normal to the surface of the excavation. Steel channels spanning between bolts or wire mesh attached to bolts may be used to control fallout between bolts (Fig. 10).

Figure 7

Fig. 7.—Experiment with crushed-rock gravel and model bolts.

The gravel is stabilized by model rock bolts and provided the ratio

length of bolts

spacing of bolts

is not less than 2, and the ratio

spacing of bolts

diameter of gravel

is not less than about 6.

Figure 8

Fig. 8.—Experiment with photo-elastic material and model bolts.

(a) the ratio

length of bolts

spacing of bolts

is 2 and the pressure bulbs interact giving a zone of uniform compression in the central third of the model.

(b) the ratio

length of bolts

spacing of bolts

is 1.5 and the pressure bulbs are almost independent

Details for this article:

Unstable rock and its treatment in underground works in the Snowy Mountains Scheme

X

Author: Moye, D. G (1965)

Article Title: Unstable rock and its treatment in underground works in the Snowy Mountains Scheme.

From: Proc Eighth Commonwealth Mining and Metallurgical Congress, Aust and N.Z. Vol.6 p. 429-441

Other Available Articles

Engineering geology for the Snowy Mountains Scheme

Moye, D.G. (1955)

Engineering geology for the Snowy Mountains Scheme.

J.I.E.Aust., Vol. 27 No.10 pp287–298

Rock Mechanics in the Investigation and Construction of T.1 Underground Power Station, Snowy Mountains, Australia

Moye, D.G. (1958)

Rock Mechanics in the Investigation and Construction of T.1 Underground Power Station, Snowy Mountains, Australia

In Engineering Geology Case Histories No.3 123–54 Geological Society of America 69 (12) p.1617

Existence of high horizontal rock stresses in rock masses.

Moye, D.G. (1962)

Existence of high horizontal rock stresses in rock masses.

Proc. Third Australia-New Zealand Conference on Soil Mechanics and Foundation Engineering. pp 19–22

Seismic Activity in the Snowy Mountains Region and its Relationship to Geological Structures

J. R. Cleary, H. A. Doyle, D. G. Moye (1964)

SEISMIC ACTIVITY IN THE SNOWY MOUNTAINS REGION AND ITS RELATIONSHIP TO GEOLOGICAL STRUCTURES

Journal of the Geological Society of Australia

Unstable rock and its treatment in the Snowy Mountains Scheme.

Moye, D.G. (1965)

Unstable rock and its treatment in the Snowy Mountains Scheme.

Proc. 8th Commonwealth Mining and Metallurgical Congress, Australia & New Zealand. Vol. 6, p. 423–441.

Diamond drilling for foundation exploration

Moye, D.G. (1967)

Diamond drilling for foundation exploration.

Paper 2150 presented at I.E.Aust. Site Investigation Symposium, September 1966. In Civil Engineering Transactions, with Discussion, April 1967.

Geology in Practice

Moye, D.G. (1970)

Geology in Practice. Presidential Address Section 3, Geology, ANZAAS Meeting.

Australian Journal of Science, 32 (12) June, p454–461.

* This paper was presented when Dan had been Director of Exploration of BHP for 3 years.

Field and Laboratory Tests in Rock Mechanics

Alexander, L. G (1960)

Field and Laboratory Tests in Rock Mechanics

Proceedings, 3rd Australian-New Zealand Conference on Soil Mechanics and Foundation Engineering, Sydney Australia, 1960, pp. 161–168.

Discussion at Technical Session No. 9—Rock Mechanics

Alexander, L. G. Moye, D. G. (1960)

Discussion at Technical Session No. 9—Rock Mechanics

Proceedings, 3rd Australian-New Zealand Conference on Soil Mechanics and Foundation Engineering, Sydney Australia, 1960, pp. 254–250