Technical information

4-11
and in Y (right) for gauges located along the loading centerline. The charts in the
middle of the figure show horizontal strains in X (left) and in Y (right) for gauges
positioned outside the loading path. The bottom charts show vertical stresses as
measured by pressure cells located on top of the base (left) and on top of the subgrade
(right). In each chart the measured gauge data is represented by solid markers. Because
the pavement was instrumented with pairs of gauges measuring the same response, two
types of markers are used. The calibrated model responses are shown using a solid line.
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Strain in X (z=5", x=0) [
μ
strains]
Computed Response
G1_measured
G3_measured
-560
-480
-400
-320
-240
-160
-80
0
80
160
-70-60-50-40-30-20-10 0
Offset [in.]
Strain in Y (z=5", x=0) [
μ
strains]
Computed Response
G2_measured
G4_measured
-30
0
30
60
90
120
150
180
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Strain in X (z=5", x=24") [mstrains]
Computed Response
G6_measured
G8_measured
-120
-100
-80
-60
-40
-20
0
20
40
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Strain in Y (z=5", x=24") [
μ
strains]
Computed Response
G5_measured
G7_measured
-10
-5
0
5
10
15
20
25
30
35
40
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Stress in Z (z=5", x=0) [psi]
Computed Response
1178_measured
1185_measured
-3
0
3
6
9
12
15
18
21
-70-60-50-40-30-20-10 0
Offset [in.]
Stress in Z (z=11", x=0) [psi]
Computed Response
1179_measured
1184_measured
Figure 4.2.2: Resilient responses during APT pass #5,000. Both measured (solid
markers) and model generated (solid line) are shown.
These figures provide some intuition and information on several experimental
and modeling aspects. First, the large difference between measured responses of the
gauge pairs is demonstrated. Graphically, these differences seem to be smaller for the