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REP39529
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REP39529
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Entry Properties
Last modified
8/25/2016 12:26:23 AM
Creation date
11/27/2007 8:25:39 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1983058
IBM Index Class Name
Report
Doc Date
4/10/1990
Doc Name
TRIAXIAL TESTING AND SLOPE ANALYSIS SPOILS PILE TWIN PINES 2 MINE ROCKVALE COLO
From
LINCOLN DEVORE INC
To
LAWRENCE G WHITE PE
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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Twin Pines No. 2 Mine <br />April 10, 1990 <br />Page -3- <br />The spoils material was compacted into a cylinder 1.398 inches in <br />diameter, with a height of 2.802 inches, at a dry density of 87.4 <br />pcf. This was the lowest density obtainable which would hold <br />together in the triaxial chamber. The specimen was saturated and <br />consolidated as required for the first pressure, then tested to <br />the failure point. The specimen was then consolidated at the <br />next pressure as required, and tested at the second point. The <br />recognized Stress Path Method was used for all three points. <br />As can be noted on the attached triaxial test sheets, the spoils <br />material was found to have a phi angle of 35° peak and 31° resi- <br />dual, with an apparent cohesion intercept of 650 psf peak and <br />570 psf residual. Of the two tests performed, it was deemed pru- <br />dent to use the lower values to calculate the slope stability. <br />Slope Analysis <br />A11 data points were entered into the computer program known as <br />Geoslope, v. 2.0. This is a micro computer version of STABL2, <br />developed at Purdue University under the sponsorship of the <br />Federal Highway Administration. As a cross-check, the values <br />were also entered into the program SWASE, a program for sliding <br />wedge analysis of side hill embankments, developed by Yong Huang, <br />supported by the Institute for Mining and Minerals Research, <br />University of Kentucky. The two programs gave answers which were <br />quite close. The lower answers were developed by STABL2 and are <br />included at the back of this report. <br />It will be noted that the STABL2 program develops the wedge ana- <br />lysis somewhat indirectly. The first run is for a circular <br />failure by the modified Bishop method. When the general weak <br />area is identified, adjustments are made to produce a block <br />failure through the weak area. This is analagous to the sliding <br />wedge analysis for side hill embankments. <br />The Geoslope program was set to analyze 100 surfaces in the cir- <br />cular failure made, printing out the safety factors of the lowest <br />10. In the block mode, the program was set to analyze 50 sur- <br />faces through the weakest area previously found, again printing <br />out the lowest 10 safety factors found. <br />Failure areas were estimated at a number of points along the pro- <br />posed spoil slope. The lowest safety factor found by changing <br />the end points of the failure is included in this report with the <br />computer printouts. <br />
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