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-52- <br />?rti?? <br />Table 2.2 Base Friction Angles (Putnam, 1981, p. 95) <br />Material residual <br />(degrees) Source* <br />Amphibolite (dry) 32 1 <br />Attapulgite 30 2 <br />Basalt (dry) 35-38 1 <br />(wet) 31-36 1 <br />Calcite (crushed) 30 2 <br />Chalk (wet) 30 1 <br />Conglomerate 35 3 <br />Dolomite (dry) 31-37 1 <br />(wet) 27-35 1 <br />Feldspar (crushed) 35 2 <br />Gneiss (schistose) 2329 1 <br />Granite 29-35 1 <br />Kaolinite 15 2 <br />3 <br />Limestone 33-37 4 <br />Melbourne Mudstone 25-35 2 <br />Montmorillonite 4-10 <br />Muscovite 17-24 2 <br />Quartz (crushed) 35 2 <br />Quartz Monzonite 32 <br />25-34 3 <br />3 <br />Sandstone <br />Sandstone (clean diamond cut) 36 5 <br />Sandstone (bentonite coated, <br />diamond cut) 32 5 <br />Shale (wet) 27 1 <br />1 <br />Siltstone (dry) 31-33 1 <br />(wet) 27-31 <br />Slate (dry) 25-30 1 <br />1 - Reported by Barton (1973) <br />2 - Kenney (1967) <br />3 - Reported by Morgen stern (1968) <br />4 - Parkin and Donald (1975) <br />5 - Pells, Rowe, and T urner (1980)