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. Intact rock properties 167 <br /> Table 11.3: Values of the constant m; for intact rock,by rock group.Note that values in <br /> parenthesis are estimates. <br /> Rock Class Group Texture . <br /> type Coarse Medium I Fine Very fine <br /> - <br /> Conglomerate Sandstone Siltstone Claystone <br /> Clastic • (fl) 19 9 4 <br /> Greywacke.— <br /> (18) <br /> ?' Chalk <br /> 7 <br /> Organic Coal <br /> i . . ---- (8-21) <br /> • <br /> Breccia Sparitic Micritic <br /> tn Non- Carbonate (20) Limestone Limestone <br /> Clastic (10) - 8 <br /> Chemical Gypstone Anhydrite <br /> 16 13 <br /> U Non Foliated Marble Hornfels Quartzite <br /> 9 (19) 24 <br /> Migmatite Amphibolite Mylonites <br /> 0 Slightly foliated (30) 25-31 (6) <br /> 1- • Foliated* Gneiss Schists Phyllites; Slate <br /> 5 ' 33 4-8 (10) 9 <br /> Granite Rhyolite Obsidian <br /> 33 (16) (19) <br /> • Light Granodiorite Dacite <br /> (30) (17) <br /> rn Diorite Andesite <br /> (28) 19 <br /> z Dark Gabbro Dolerite Basalt <br /> (19) (17) <br /> Norite <br /> 22 <br /> Extrusive Agglomerate Breccia Tuff <br /> pyroclastic type (20) (18) (15) <br /> *These values are for intact rock specimens tested normal to bedding or foliation.The value <br /> of mtwill be significantly different if failure occurs along a weakness plane. <br /> In deciding upon the value of aci for foliated rocks, a decision has to be made on <br /> whether to use the highest or the lowest uniaxial compressive strength obtained from _ <br /> ,IC 00787 <br /> Peterso&Elk Creek <br />