1354
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Table. 1. Field monitoring system section
Freezing
index
(
℃·
day)
Cutting
section
Boundary
section
Banking
section
No. 1
1
1
1
No. 2
1
1
1
550
-
650
No. 3
1
1
1
No. 4
1
1
1
No. 5
1
1
-
450
–
550
No. 6
1
1
1
No. 7
1
1
1
No. 8
1
1
-
No. 9
1
1
1
350
–
450
No. 10
1
1
1
No. 11
1
1
1
No. 12
1
1
-
200
–
350 No. 13
1
1
1
No. 14
1
1
-
Below
200 No. 15
1
1
1
Total
15
15
11
Figure 2. Field monitoring region
2.3 Process of Field monitoring system construction
The placement of measurement sensors accompanies the
calibration of sensors before the placement. To construct a field
measurement system as shown in Fig. 3, the measurement
sensors were laid at the center of each layer. After the
placement is completed and then installed modem, battery, solar
panel and data logger, consecutively, to collect data through
wireless communication in console box. Fig. 4 shows the view
of the installation of automatic measuring system.
Figure 3. Placement of measuring instrument on the compacted roadbed
materials
Figure 4. Construction of field automatic monitoring system
3 FROST PENETRATION DEPTH OF PAVED ROAD
WITH FIELD MONITORING DATA
3.1 Analysis of frost penetration depth for the region with
freezing index 550~650 ·day
The analytical study of temperature distribution along the paved
road profile was carried out by using the measured lowest daily
temperature in the field. Figure 5 shows the temperature
variations and correlation for pavement section for three areas
with anti-frost layer existence and non-existence.
(a) Existence of anti-frost layer
(b) Non-existence of anti-frost layer
Figure 5. Frost penetration depth of No.1 region
3.2 Analysis of frost penetration depth for the region with
freezing index 450~550
℃
·day
The analytical study of temperature distribution along the paved
road profile was carried out by using the measured lowest daily
temperature in the field. Figure 6 shows the temperature
variations and correlation for pavement section of three areas
with anti-frost layer existence and non-existence. The
temperatures of No.4 or No.5 cases went down below 0
℃
to
subbase course and base course regardless of anti-frost payer
