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y <br />March 3, 1997 <br />-2- 963-2178400.410 <br />2.0 SELECTION OF MATERIAL PROPERTIES <br />The material properties used for the analyses were estimated by: <br />- Reviewing results from laboratory testing obtained from previous <br />investigations performed at West Elk Mine, <br />- Evaluating the soils expected to be encountered along the proposed road <br />alignment and at the shaft site with respect to material "properties for <br />similar soils. <br />2.1 Literature Review <br />Geotechnical investigations provided to Golder by MCC include: <br />- Lambert and Associates, August 6, 1996, <br />- Michael Baker Associates, 1984, <br />- Geo-Hydro Consulting, Inc., November 21, 1980, <br />- International Engineering Co., October, 1976. <br />Twenty-two soil strength tests were evaluated on a variety of material types. The tests <br />included both direct shear and triaxial. The results of both of the triaxial tests were c=0 <br />and ~ = 34°, and the results of the direct shear tests ranged from c=0 to 900 psf and ~ _ <br />19° to 40°. The table below illustrates the range in values. <br />2.2 Material Properties <br />Given the wide range of material properties, a cohesion of 200 pounds per square foot was <br />selected because it resulted in a realistic failure surface. When higher cohesion values <br />were assumed, an unrealistically deep failure surface occurred when it was analyzed as <br />input in XSTABL. An internal angle of friction of 35° was selected because it was within <br />a range of internal angles for similar material (28° to 42°) (Hun[, 1983). <br />sm.~oa~:ne~xneeMV.°or Golder Associates <br />