|Table of Contents|

Automatic measure and character of highway subgrade temperature field in cold region(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年03期
Page:
21-26
Research Field:
Publishing date:
2011-06-30

Info

Title:
Automatic measure and character of highway subgrade temperature field in cold region
Author(s):
HAN Chun-peng;  HE Dong-po;  CHENG Pei-feng;  REN Gui-bo;  WANG Hai-peng
School of Civil Engineering, Northeast Forestry University, Harbin 150040, Heilongjiang, China
Keywords:
road engineering;  highway in cold region;  subgrade temperature field;  temperature measuring system;  frost depth
PACS:
U416.168
DOI:
-
Abstract:
Aimed at the trouble of complex external environment, inaccessibly automatical and continuous measurement, DS18B20 temperature sensor, STC89C58 singlechip, DS12C887 clock and AT24C256 external memorizer are assembled as an observation system of temperature, which is powered by lithium batteries. Automatical collection, saving and continuous observation are achieved by this system. In the period of freezing-thawing cycling, the biggest frozen depth is 2.3 m under the top of subgrade, 0.85 m deeper than natural foundation. It indicats that the original temperature field's status of natural foundation is changed by subgrade. The subgrate frost depth reached maximum in March, and about 50 days later than the variation of atmosphere temperature. The heterogeneous phenomenon happens in the process of subgrade freezing-thawing. In the time of thawing, there are saddle-shaped frozen areas in the subgrade, and the frozen nucleus appears at the end of thawing. This may offer foundation for analyzing the subgrade diseases in cold region. 13 figs, 10 refs.

References:

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Last Update: 2011-06-30