冻融循环作用下多年冻土区公路路基三场耦合分析理论模型  

Three Coupling Analysis Model for Embankment in Permafrost Regions under Freezing and Thawing Cycle

作　　者：陈建兵[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2015年第10期12-18,共7页Highway

基　　金：国家科技支撑计划;项目编号2014BAG05B01;2014BAG05B03

摘　　要：冻土体在冻胀、融沉过程中受控于土体中的水、热、力的变化规律,其本质是冻土多孔介质中颗粒、冰晶体、未冻水这3种物质在温度势、土水势、压力与变形等外界因素作用下的相互运动、迁移、扩散与相变。基于饱和冻土冻融循环过程中,土水体系冰-水相变及未冻水的迁移规律,采用热物理学基本原理,推导了冻土水、热、变形三场耦合的理论架构模型与基本方程。同时选取青藏公路典型路面建立冻土路基二维数值计算模型,对其趋势和规律进行了初步分析,验证了构建的三场耦合理论框架的合理性和可行性。Permafrost heaving and thawing process of soil are controlled by changing regulations of water,heat and force contained in soil,and the essence is granules,ice crystals and unfrozen water acting or reacting on each other under temperature,soil,water potential pressure and deforming factors.Based on the ice-water phase transition and unfrozen water in saturated permafrost freeze-thaw cycle,thermal physics principles are used to derive water,thermal,deforming coupling theory framework and basic equation.Typical pavement in Qinghai-Tibet Highway is selected to establish two-dimensional numerical model of permafrost embankment,preliminary analysis is made to embankment developing trends and patterns,and in the meantime the rationality and feasibility of three physics coupling theory are verified.

关 键 词：公路路基 冻融循环 连续性条件 能量关系 应力-应变关系 三场耦合分析 

分 类 号：P642.14[天文地球—工程地质学]