SOME FUNDAMENTAL ASPECTS OF THE USE OF DISC CUTTERS IN HARD-ROCK EXCAVATION
Some important aspects of the design of rock-cutting systems remain relatively unexplored. Two areas of practical significance in this context form the subject of this paper: cutting in jointed or fissured rock, and groove deepening. A series of controlled laboratory experiments on the performance of disc cutters in jointed rock showed that the spatial and geometrical configuration of jointed rock masses needs to be taken into consideration in the design of mechanized rock-excavating systems. One series of experiments showed that, under favourable geometric conditions, the energy required to cut in a jointed rock mass is at least half that required to cut otherwise intact rock. Groove-deepening-the progressive deepening of a groove by successive passes of a cutter - is a potential operational feature with most mechanized rock-excavating systems. Laboratory experiments revealed an important fundamental cycle of events associated with disc cutters when progressively deepening a groove in intact rock. Furthermore, in contrast to pick cutting, groove deepening by discs is shown to be an efficient operation and one that should not necessarily be avoided. This can be directly attributed to increased interaction between the disc cutters as the result of an increase in magnitude of the lateral forces generated as a groove is deepened. (TRRL)
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Corporate Authors:
Institution of Mining and Metallurgy
Box 61019
Marshaltown, Transvaal, South Africa -
Authors:
- HOWARTH, D F
- Roxborough, F F
- Publication Date: 1982-11
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: p. 309-315
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Serial:
- Journal of S African Inst of Mining & Metallurgy
- Volume: 82
- Issue Number: 11
- Publisher: Institution of Mining and Metallurgy
Subject/Index Terms
- TRT Terms: Cutting tools; Design; Equipment; Excavation and tunneling; Joints; Rock excavation; Rock jointing; Rocks; Sawing; Simulation; Tunneling
- Old TRIS Terms: Cutters; Rock tunneling
- ITRD Terms: 9011: Design (overall design); 3674: Equipment; 2998: Joint (structural); 4154: Rock; 5128: Sawing; 9103: Simulation
- Subject Areas: Bridges and other structures; Construction; Design; Geotechnology; Highways; Public Transportation; Vehicles and Equipment; I54: Construction of Tunnels;
Filing Info
- Accession Number: 00382820
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD, TRIS
- Created Date: Apr 30 1984 12:00AM