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Intact rock properties <br />Table l 1.3: Values of the constant m; for intact rock, by rock group. Note that values in <br />pazenthesis are estimates. <br />167 <br />Rock Class Group Texture <br />type Coarse Medium Fine Very fine <br /> Conglomerate Sandstone Siltstone Claystone <br /> clastic (22) 19 9 4 <br /> Greywacke,- <br /> (18) <br /> Chalk <br />z Organic <br /> Coal <br /> (8-21) <br />W Brescia Sparitic Micritic <br />ti Non- Cazbonate (20) Limestone Limestone <br /> clastic (10) $ <br /> Chemical Gypstone, Anhydrite <br /> 16 13 <br />U Non Foliated Mazble Homfels Quartzite <br /> 9 (19) 24 <br /> Migmatite Amphibolite Mylonites <br />O Slightly foliated (30) 25 - 31 (6) <br /> <br /> Foliated' Gneiss Schists Phyllites- Slate <br />~ 33 4-8 (10) 9 <br /> Granite lthyolite Obsidian <br /> 33 (16) (19) <br /> Light <br /> Granodiorite Dacite <br /> (30) (1'~ <br />~ Diorite Andesite <br />~ (28) 19 <br /> Dazk Ga <br />b~ro Dolerite .Basalt <br /> 2 (19) (17) <br /> Norite <br /> 22 <br /> Bxtrusive Agglomerate Brescia Tuff <br /> pyroclastic type (20) (18) (15) <br />' These values are for intact rock specimens tested normal [o bedding or foliation. The value <br />of mlwill be significantly different if failure occurs along a weakness plane. <br />In deciding upon the value of a~; for foliated rocks, a decision has to be made on <br />whether to use the highest or the lowest uttiaxial compressive strength obtained from <br />JC 00797 <br />PetersonlElk Creek <br />