摘要
为了得到二维情况的道路冻深简化计算方法,运用COMSOL Multiphysics软件,建立二维非稳态道路温度场数值模型,验证了所建数值模型的可靠性;计算出不同月份的道路冻深值,研究了道路冻深的发展过程,确定最大冻深出现的大致时间;计算出道路横断面不同位置处的最大冻深值,研究了道路冻深的横向不均匀性,提出应将硬路肩边缘处的最大冻深作为设计时的道路冻深;对影响道路冻深的几何参数、边界参数、材料参数进行参数敏感性分析,发现对冻深影响较大的因素有日最高温度与日最低温度的差值、年平均温度以及土基的热物参数,并通过多项式拟合给出了计算道路冻深的经验公式。
In order to get the simplified calculation method of road frost depth considering two-dimensional circumstance, a two-dimensional unsteady temperature field numerical model for roads is established by COMSOL Multiphysics software and the reliability of the numerical model is verified;by calculating road frost depth in different months, the development process of the frost depth is studied, and the approximate time the maximum frost depth appeared is determined;calculate the maximum frost depth at different location of road cross section, and study the lateral inhomogeneity of road frost depth, then put forward that the road frost depth in design should be the maximum frost depth at the edge of the hard shoulder;the sensitivity of the geometrical parameters, boundary parameters and material parameters who affect the road frost depth are analyzed, and find that the main factors influencing the frost depth are the difference between daily maximum temperature and daily minimum temperature, the annual average temperature and the thermal parameters of soil base, and the experience formula for calculating the road frost depth is given through the polynomial fitting.
作者
王方立
陈钟
吕欢
WANG Fangli;CHEN Zhong;LYU Huan(China Road and Bridge Corporation,Beijing 100011,China)
出处
《路基工程》
2020年第1期141-146,共6页
Subgrade Engineering
关键词
道路工程
冻深计算公式
数值模拟
温度场
季节性冻土区
road engineering
calculation formula of road frost depth
numerical simulation
temperature field
seasonally frozen region
