季节性冰冻地区公路路基冻胀融沉过程规律研究

为准确掌握路基结构温度场的分布特点和冻胀融沉过程的变化规律,以季节性冰冻地区典型道路结构路基温度场和变形量的跟踪观测数据为基础,开展了季节性冰冻地区路基温度场分布与冻胀融沉变形量,以及冻结深度三者的规律研究。研究显示:路基温度场分布特性以年为周期呈余弦规律变化,不同深度路基温度变化存在滞后性;根据路基冻结深度变化规律,可将冻结过程划分为四个阶段。在此基础上,基于观测数据,冻胀量和冻结深度分别与地表负积温呈显著正相关,可通过监测冻结深度的变化得到冻胀变形量,降低监测成本及实测难度。

A study on freezing and thawing process characteristic of subgrade in seasonally frozen regions

Based on the field data collected from a medium-scale experimental pavement system, temperature distribution characteristic and freezing thawing process of subgrade in seasonally frozen regions was studied in detail. Test data illustrated that: The temperature of subgrade changed with time, and it followed cosine distribution; The freezing process can be divided into four stages according to the change law of frozen depth. Based on the collected data, the prediction model for subgrade deformation and frozen depth showed significant positive correlation with temperature. By monitoring the frozen depth change got the subgrade deformation and reduced the monitoring cost and actual difficulty.