PERMFILE139602

• Permit No: C1981034
• IBM Index Class Name: Permit File
• Doc Date: 8/31/1981
• Section_Exhibit Name: APPENDIX B Armstrong Part 2
• Media Type: D
• Archive: No

' A total of four unconsolidated-undrained direct shear
tests were performed on the bulk samples provided for our use.
' Representative samples were obtained for the direct shear
tests from each of the material types including each of the
' two (2) overburden samples, a sample of the unweathered coal
refuse, and a sample of the weathered coal refuse. These
' representative samples were then wet sieved through a 40 sieve
and the tests were performed on the material passing the
sieve after it caas allowed to air dry to a moisture content
' slightly above its plastic limit and then compacted by kneading.
' The results of our sieve analysis tests are shown graph-
ically in Figures 3 through 6 included within this report. The
results of the Atterberg limits tests are tabulate d below
' along with the results of our direct shear tests. The direct
' shear resu lts are also shown graphically later in
h this report
in Figures 7 throug
10.
' STABILITY ANALYSIS
' ]de analyzed a cross-section of the dispoal area using a
Bishop r]ethod of Slices computer program and the data obtained
t from our laboratory testing. The cross-section analyzed was
one of the least stable cross-sections which was provided for
' our use. The cross-section used along with the presumed
highest phreatic surface possible is shown in Figure 2.
' Included within this figure are the engineering properties
of the soils which were used in the analysis as well as the
resulting failure surface location. The location of the
phreatic surface was determined considering the worst conditions
possible for the soils tested and by also considering the
' drainage conditions involved as well as the probable final
properties of the placed materials. Appendix A provides a
' listing of the results of the computer run used for the
analysis of this problem.
' -3-
1