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GENERAL38051
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Last modified
8/24/2016 7:57:58 PM
Creation date
11/23/2007 9:27:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
General Documents
Doc Date
7/20/1995
Doc Name
CRESSON PROJECT PN M-80-244 PLACEMENT OF CARLTON MILL TAILING MATERIAL IN HIGHWAY 67 EMBANKMENT
From
CRIPPLE CREEK & VICTOR GOLD MINING CO
To
DMG
Media Type
D
Archive
No
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Iuly 14, 1995 -2- 953-2900.007 <br />The compression of the soil grains and pore water fluid can be generally neglected. -As <br />the air and pore water fluid is squeezed out, the soil panicles arrange themselves in a <br />denser co~guration, resulting in a decrease in volume. The rate at which this occurs is a <br />function of the permeability of the soil. <br />Testing Procedure <br />The results of the consolidation tests performed on the 20 percent Cazlton Tailings / 80 <br />percent Pad No. 2 mixture are presented in Attachment I. The sample was screened so <br />that any material in excess of 3/4 inch was removed, due to the limitations of the testing <br />appazatus. The effect of removing the oversized material would be to slightly reduce the <br />permeability of the mixture and result in conservative consolidation parameters. The <br />mi.~ctttre was compacted to 95 percent standazd Proctor maximum dry density at <br />approximately the optimum moisture content, to represent field conditions. The testing <br />prot3-am consisted of placing the compacted mixture in a 9 inch diameter by 4-1/2 inch <br />deep sample mold and loading the sample to 12.5 psi, 25 psi, 50 psi and 100 psi. At 100 <br />psi, the sample was inundated after the initial consolidation at optimum water content, to <br />determine if saturating the sample would result in the additional collapse of the soil <br />structure. <br />The results of the standazd Proctor test and the grain size analysis for the mixture aze <br />presented in Attachment 2. <br />Test Results and Estimate of Total Settlement <br />The consolidation test data for the mixture is summarized as follows: <br />Load (psi) Void Ratio <br />0 (Initial) 0.3807 <br />13 0.3793 <br />25 0.3783 <br />50 0.3757 <br />100 0.3726 <br />100 (Saturated) 0.3726 <br />The test results indicate that no collapse mechanism was observed to occur when the <br />sample was fully inundated with water at the f 00 psi load increment. <br />Settlement calculations aze presented in Attachment 3. The settlemen[ associated with <br />the consolidation is expected to be minimal, in the order of 0.5 percent of the fill height. <br />It is expected that the settlement of the fill should be completed in approximately 3 <br />months, with a majority of the consolidation expected to occur during the construction <br />season <br />Golder Associates Inc. <br />
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