寒冷地区路基冻胀的计算模型和方法研究

Calculation model of roadbed frozen frost on the cold zone

从路基冻胀机理出发,把冻胀过程的路基土体划分为3个区段:冻土区,冻结缘区和未冻土区,充分考虑冻结缘区的桥连作用,把3区段连在一起构成了桥连式冻胀模型。根据各区段的本质特征和主导作用,建立了相应的控制方程,并用连接条件构成一个完整的求解体系,采用半解析数值法对路基冻胀可进行定量计算。通过实例计算证明,结果与实例值吻合较好,说明本文模型和方法是有效的。

From the roadbed freezing expansion principle,the frost heave process of roadbed soil is classified into three sections： the frozen zone,freezing margin zone and Non-freeze zone.Full consideration of link function of freezing margin zone,the bridge-link frost heaving model was proposed in this paper.According to the different sections of the role,the control equations,and connection condition to complete solution system were established.By using the semi-analytical numerical method,the roadbed freezing expansion can be quantitatively calculated.The good agreement between the calculation results and observed data show the model and method proposed in this paper are valid.