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Net Cutting Rate (NCR) and Specific Pick Consumption (SPC) ROADHEADER IN TUNNELING. S. TATION EXCAVATION, EAST SIDE ACCESS . 38 . ROADHEADER IN TUNNELING.

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Line spacing between picks directly controls the cross-sectional area swept by picks, hence, the force level imposed on picks. The effects of line spacing on roadheader cutting head performance have been studied systematically and well documented (Evans, 1972; Roxborough, 1973; Hurt and MacAndrew, 1981; Hurt et al., 1982; Hurt and MacAndrew, 1985).

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