TM 5-852-4/AFM 88-19, Chap. 4
I.
Other data. The availability and quality of
vation, and solifluction is the perceptible slow downslope
flow of saturated nonfrozen soil over a base of
gravel, sand, rock, water for portland cement concrete,
impervious or frozen material. Creep may be frost creep,
usable local timber, and needed fill and backfill materials
resulting from progressive effects of cyclic frost heave
should be established. It is impossible to develop
and settling, or may be simply extremely slow continuing
realistic cost estimates for the construction unless this is
deformation of frozen or unfrozen materials under stress.
done.
When siting of a facility in a location possibly susceptible
(1) The availability of existing or potential
to such conditions is contemplated, careful study of the
transport facilities, means of access, sources of labor,
terrain should be made for possible evidences of such
and sources of construction equipment and supplies
movements. Where movement is suspected but is not
must be determined. These data may be controlling the
obvious it may be necessary to install movement points
decisions on type of foundation design to be employed.
on the slope in question and obtain actual
(2) More detailed guidance for general site
measurements by careful surveying techniques. If either
investigations is contained in TM 5-852-2/AFM 88-19,
11
visual observation or measurements indicate a problem
Chapter 2 .
exists, the site should be avoided if at all possible,
(3) Design technical data in the following
because stabilization or protective measures against
categories are discussed separately in the paragraphs
such movements are likely to be extremely expensive or
indicated:
even impractical. Obvious evidences of slope instability
Soil strength tests (compression, tension,
are the bending of vegetation growth patterns out of the
shear), paragraphs 2-5, 4-4, 4-5, 4-8
normal vertical position, lobe-like thrusts of material over
Pile load tests, paragraph 4-8
downslope material, traces of sloughs or actual slides
Bearing test, paragraph 4-5
and displacements of roads or other facilities from their
Anchor tests, paragraph 4-14
original alignments. Most such evidences are even more
Dynamic response tests (moduli, wave
readily revealed by air photos than by on-the-surface
propagation), paragraphs 2-5, 4-6
inspection.
Lateral pressures, paragraphs 4-3, 4-10
U. S. Army Corps of Engineers.
Figure 3-9. Soil profile, south wall of trench near south edge of taxiway, Elmendorf AFB, Alaska.
3-14
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