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J. Korean Soc. Hazard Mitig. > Volume 19(7); 2019 > Article
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Journal of the Korean Society of Hazard Mitigation 2019;19(7):39-46.
DOI: https://doi.org/10.9798/KOSHAM.2019.19.7.39    Published online December 31, 2019.
도로 동상방지층의 온도계측 자료를 이용한 수치해석 연구
손재호1, 서용원2, 박영목3, 조규태4
1정회원, ㈜동명기술공단종합건축사사무소 사원
2영남대학교 건설시스템공학과 교수
3종신회원, 영남대학교 건설시스템공학과 교수
4정회원, 영남대학교 건설시스템공학과 교수
Temperature Prediction of Road Anti-Frost Layer
Jaeho Son1, Youngwon Seo2, Youngmog Park3, Gyutae Cho4
1Member, Staff, Dong Myeong Engineering Consultants & Architecture Co., Ltd
2Professor, Department of Civil Engineering, Yeungnam University
3Permanent Member, Professor, Department of Civil Engineering, Yeungnam University
4Member, Professor, Department of Civil Engineering, Yeungnam University
Corresponding author:  Gyutae Cho, Tel: +82-53-810-2414, Fax: +82-53-810-4622, 
Email: gtcho@ynu.ac.kr
Received: 19 September 2019   • Revised: 23 September 2019   • Accepted: 29 October 2019
Abstract
In Korea, the temperature drops below 0 °C in winter and rises above 0 °C in spring. The temperature variation between the two seasons causes the ground to freeze and thaw, which damages the road pavement structures. Predicting the ground temperature is very important to identify and respond to the road damage due to ground freezing and thawing. Numerical analysis was performed using the Crank-Nicholson differential method to predict the temperature of each layer of the road. Additionally, the data gathered from temperature measurements of each layer of the road pavement for 42 days for "Evaluation of validity for Anti-frost layer and development of its construction criteria" organized by the Ministry of Land, Transport, and Maritime Affairs (2012) was used for the prediction. The thermal diffusion factor obtained in the present numerical analysis were compared with those of previous studies. The numerical analysis was conducted using temperature data measured from three sections: cutting area, boundary area of cutting and banking, and low banking for 42 days from January 25, 2011 to March 6, 2011. The coefficient of thermal diffusion are 1 × 10-1.6, 1 × 10-2.8, 1 × 10-2.1, and 1 × 10-2.3 in the surface, base, subbase, and anti-frost layers, respectively. The calculated value of the lowest temperature showed a difference of approximately 3 °C compared with the actual measured temperature.
Key Words: Crank-Nicholson Model, Anti-frost Layer, Thermal Diffusivity, Ground Temperature
요지
우리나라는 겨울철이 되면 기온이 0 ℃이하로 내려가고 지반이 동결되고 팽창되어 도로구조물에 피해를 끼친다. 지반동결로 인한 피해를 사전에 파악하고 대처하기 위해서는 지중온도의 예측은 매우 중요하다. 지중온도를 예측하기 위하여 장기간 도로포장구조물의 온도를 측정한 국토해양부(2012)에서 주관한 “도로 동상방지층의 효용성 검증 및 설치기준 연구”의 포장층별 온도자료를 이용해 Crank-Nicholson차분법에 의한 수치해석을 통하여 온도예측을 실시하였다. 저성토부, 절성경계부, 절토부으로 세 구간의 표층, 기층, 동상보조기층, 동상방지층의 온도데이터로 수행하였고, 기간은 2011년 1월25일~2011년 3월 6일 총 42일간의 자료를 이용하여 수치해석을 실시하였다. 열확산계수는 표층, 기층, 보조기층, 동상방지층에서 각각 1 × 10-1.6, 1 × 10-2.8, 1 × 10-2.1, and 1 × 10-2.3 cm2/s로 나타났고, 계산결과온도와 실체측정온도의 최저기온에서 약 3 ℃ 차이가 나타났다.
핵심용어: 크랭크-니콜슨 차분법, 동상방지층, 열확산계수, 지중온도
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