Fatigue properties of intact sandstone in pre-and-post failure and its implication to vibratory rock cutting
IR@CIMFR: CSIR-Central Institute of Mining and Fuel Research, Dhanbad
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| Title |
Fatigue properties of intact sandstone in pre-and-post failure and its implication to vibratory rock cutting
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| Creator |
Bagde, M.N.
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| Subject |
Blasting
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| Description |
The pre- and post- failure fatigue properties of intact sandstone subjected to uni-axial cyclical loading in the
laboratory is presented with its possible implication to vibratory rock cutting. The fatigue results subjected
to sinusoidal, ramp and square waveforms at cyclic loading frequency of 5 Hz and peak amplitude of
0.05 mm is discussed herewith. It is observed that fatigue behaviour is a function of the dynamic energy
of the load and the shape of the waveform. From the presented results, the practical significance of the
behaviour of rock and rock masses within the excavation systems subjected to cyclic loads, especially in
the vibratory rock cutting is put forward. To substantiate the cyclic breaking of rock under vibratory loading
condition, a numerical simulation results using discrete element code is presented. Two loading cases were
considered. In the first case, the wedge pick was loaded non-cyclically (monotonically), and in the second
case it was loaded dynamically under cyclic sinusoidal loading at 50 Hz frequency. A load-deformation
curve under monotonic (non-cyclic) loading condition and cyclic loading conditions were examined. The
model showed a drop of about 25% in peak strength in the case of cyclically loaded wedge pick compared
to monotonic or quasi-static loading of the wedge pick cutting. It is inferred that the vibratory loading has
benefits in fracturing rock at relatively lower load compared to conventional loading
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| Date |
2015-01
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| Type |
Article
PeerReviewed |
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| Identifier |
Bagde, M.N. (2015) Fatigue properties of intact sandstone in pre-and-post failure and its implication to vibratory rock cutting. ISRM, 4 (1). pp. 2277-27.
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| Relation |
http://cimfr.csircentral.net/2613/
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