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REP43914
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REP43914
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Entry Properties
Last modified
8/25/2016 12:46:15 AM
Creation date
11/27/2007 10:04:55 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Report
Doc Name
GEOTECHNICAL INVESTIGATION WEST PIT EXCESS SPOIL DISPOSAL SITE COLOWYO COAL MINE MOFFAT CNTY COLO
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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_IZ_ <br />Characteristics of Materials <br />The characteristics of the spoil fill material were estimated .from <br />observation of performance of existing spoil piles, review of various reports <br />performed for The Colowyo Coal Company, our experience with spoil <br />generated from similar overburden materials in other areas of Routt and <br />Moffat Counties, and published data regarding strength characteristics of <br />rock fills. In our opinion, the fill will function essentially as a granular <br />material. We used an angle of internal friction in the range of 35 to 39 <br />degrees. No cohesion was assumed to occur in The spoil. <br />The stiff to very stiff clays found in our borings at The valley bottom <br />were tested using Triaxial strength tests and unconfined compressive strength <br />tests. The unconfined compressive strength tests indicated cohesion of about <br />3,000 psf; this represents undrained shear strength. A Triaxial strength Test <br />performed using aconsolidated-undrained test procedure with pore pressure <br />measurements indicoted drained shear strength of 500 psf and a friction angle <br />of I S° for the clay. <br />We assumed The underlying bedrock found below the valley bottom and <br />near the surface on the slopes of the spoil area To have o cohesion intercept <br />of 5,000 psf and no friction. This is likely a conservative estimate of The <br />actual shear strength of the bedrock. <br />Drainage Conditions <br />Performance of any fill, or natural slope, is highly influenced by the <br />location of the free water surface which develops in the slope. Diversion of <br />surface drainage around the spoil will limit the amount of water entering the <br />e <br />
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