PERMFILE138205

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 5/1/2003
• Doc Name: Sediment Pond SEDCAD Results
• Section_Exhibit Name: Tab 13 Attachment 13-5B Appendix 1
• Media Type: D
• Archive: Yes

TABLE 1
Typica{ physical and mechanical properties for common soils (extracted from Lambe and
Whitman, 1969; Simons et al., 1978; Abramson et al., '1996).
Angle of
Unified Cohesion Internal Unit Weight Unit Weight
group (c), Friction Imy, Dry, Wet,
Typical soil names symbol psf (kPa) degrees pcf (t/m3) pcf (Vm'!
Well-graded gravels, gravel-sand GW - 38.3 83-118 84-136
mixtures, little or no fines 11.3-1.9) (1.3-2.2)
Poorly graded gravels, gravel-sand GP - 36.5 - -
mixtures, little or no fines
Silty gravels, poorly graded GM 0-50 33.8 89-146 90-155
gravel-sand-silt mixtures (0-2.4) {1.4-2.3) (1.4-2.5)
Clayey gravels, poorly graded GC 0-100 31.0 100-148 125-156
gravel-sand-clay mixtures 10-4.8) (1.6-2.4) (2.0-2.5)
Wel! graded sands, gravelly SW - 37.6-39.0 87-127 88.142
sands, little or no fines 11.4-2.0) (1.A-2.3)
Poorly graded sands, gravelly SP - 35.8-37.2 84-140 115-151
sands, little or no fines (1.3-2.2) (1.8-2.4)
Silty sands, poorly graded SM 0-50 30.6-36.1 - -
sand-silt mixtures (0-2.4)
Clayey sands, poorly graded SC 0-100 27.9-33.8 - -
sand-clay mixtures (0-4.8)
Inorganic silts and very fine ML 0-100 30.1-33.4 BO-116 81-136
sands, silty or clayey fine sands (0-4.8) (1.3-1.9) (1.3-2.2)
with slight plasticity
Inorganic clays of low to CL 0-400 26.6-30.1 60-135 100-147
medium plasticity. gravelly clays, (0-19.2) (1.0.2.1) (1.6-2.4)
sandy clays, siky clays -
Organic silts and organic silt-clays OL 0-200 - - -
of low plasticity (0-9.6) ~ _
Inorganic silts, micaceous or MH 0-200 22.9-27.5 76-120 77-138
diatomaceous tine sandy or silty 10-9.6) (1.2-1.9) 11.2.2.2)
soils, elastic silts
Inorganic clays of high plasticity, CH 0-500 74.6.23.8 50-112 94-133
fat clays (0-23.91 (0.8-1.81 (1.5-2.11
Organic clays of medium to OH 0-400 - 30-100 61-125
high plasticity 10-19.2) (0.5-1.6) (1.3-2.0)
Peat and other highly organic soils Pt - - 40-110 87-131
(0.6-1.5) (1.4-2.U
subsidence and horizontal displacement at a point on
slope surface caused by the extraction of the element in
the coal seam become

By integrating Eqs. (2) and (3) throughout the
"mined" area, the mathematical expressions for the final
subsidence and horizontal displacement at a point of in-
terest on slope surface can be obtained as
S'=S+Gsina V (4)
U' = U + G cosa Y (5)
and
V = S sin a + U cosa (6)
where
•~ S and U are the final subsidence and horizontal displace-
ment at the point on a flat surface, respectively.
Sand U can be predicted with good confidence using the
current technologies.
It should be noted that the product of G V in Eqs .
(4) and (5) is the total incremental movement caused by
the topographical effect of the surface natural slope. The
model also shows that [he final movement on a slope
surface consists of two parts: that on a flat surface and an
incremental amount induced by topographical effect.
The incremental movement can be readily determined
once the proportionality coefficient (G) is given. A ten-
tative method for determining G has been given (Luo,
1989). However, this method was only able to consider
the surface natural slope as its independent variable.
even though a later study showed that the natural slope
is indeed one of the important facmrs (Luo and et aL,
1996}. It has long been speculated that G could be de- ~
pendent on the slope geometry (i.e., slope angle and
depth of soii layer), physical and mechanical properties ~,
(i.e., density, moisture content, cohesion and angle of in-
ternal friction) of the soil layer. However, a rational re-
lationship between G and the mentioned factors has not
been established before.
II f
MINING ENGINEERING ^ JUNE 1999 '101 I