The National Geographic Magazine, Volume 194National Geographic Society., 1998 - Geography |
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Page 20
... rock stress determination . USBM Info.Circ . 8618 : 32 . Hudson , J.A. , Cornet , F.H. & Christiansson , R. 2003. ISRM Suggested Methods for rock stress estimation . Part 1 : Strategy for rock stress estimation . Special Issue on Rock ...
... rock stress determination . USBM Info.Circ . 8618 : 32 . Hudson , J.A. , Cornet , F.H. & Christiansson , R. 2003. ISRM Suggested Methods for rock stress estimation . Part 1 : Strategy for rock stress estimation . Special Issue on Rock ...
Page 217
... rock strata . Sandstone A rock made up of sand grains . Schist A metamorphosed mudrock with abundant large mica crystals . Scoria Lumps of chilled magma ( usually basaltic ) with a bubbly structure , though denser than pumice . Sedimentary ...
... rock strata . Sandstone A rock made up of sand grains . Schist A metamorphosed mudrock with abundant large mica crystals . Scoria Lumps of chilled magma ( usually basaltic ) with a bubbly structure , though denser than pumice . Sedimentary ...
Page 325
... Rock Masses The Index of Rock Mass Basic Quality, BQ Strong Rock; Intact Rock Mass 550 II Strong Rock; Less intact rock Mass. Less Strong Rock; Intact Rock Mass. 550 - 451 III Strong Rock; Less Fractured Rock Mass. Less Strong Rock or ...
... Rock Masses The Index of Rock Mass Basic Quality, BQ Strong Rock; Intact Rock Mass 550 II Strong Rock; Less intact rock Mass. Less Strong Rock; Intact Rock Mass. 550 - 451 III Strong Rock; Less Fractured Rock Mass. Less Strong Rock or ...
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