【摘要】 基于ABAQUS有限元及其二次开发平台,建立了多年冻土地区机场沥青道面地基温度场分析模型,对不同宽度道面地基温度场进行对比分析,同时对地基温度场影响范围、地基最大融化深度进行研究。结果表明:机场道面宽度对地基温度场影响明显,在相同时间条件下,随着道面宽度的增加,地基融土核最高温度不断上升融土核面积不断扩大,且椭圆形融土核中部越来越饱满;外界温度对5 m深度内地基温度影响显著,随着深度的增加影响越来越小,达到一定深度后地基温度基本保持不变;不同道面宽度地温沿水平方向温度变化呈"Z"形分布,越接近道肩处温度变化越明显,同时道面对天然冻土的影响范围约为距道肩20 m内;道面中心处融深随宽度的增加呈现两个阶段上升趋势,且道中融深明显大于道肩融深,道肩融深受机场道面宽度影响很小。基于此建立了道中地基融深受道面宽度影响的变化规律,为多年冻土区机场建设提供相应的理论依据。更多还原

【Abstract】 Finite element models of temperature field of permafrost asphalt airport pavement subgrade are constructed based on ABAQUS and the secondary development platform. The temperature fields of airport pavement under different widths are compared and analyzed by the model,while the influence of ground temperature field and the change rules of melting depth are studied. The results show that the width of airport pavement has a great impact on the temperature of subgrade. After the same time durition,the highest temperature of subgrade melt nuclear will keep rising constantly with the increase of width,the melt nuclear area is expanding continuously,and the central nucleus will grow fuller. The ambient temperature will influence the subgrade temperature within 5 m significantly,and the influence will be increasingly less along with the increase of the depth when the temperature of the subgrade is kept constant after reaching a certain depth. The geothermal temperature of different pavement width changes along with the horizontal changes of direction via the distribution of "Z" type,and the closer to the road shoulder,the more obvious the change.The impact area of airport pavement on natural permafrost is within 20 m from the shoulder. There are two phases of rising trend in the melting depth at the center when the width increases. The melting depth at the center is deeper than the one at the shoulder,and the width of airport pavement has little impact on the melting depth at the shoulder. Therefore,the change rule between the width of airport pavement and melting depth at the center is established base on the above statement which can provide a theoretical basis for airport construction in field of permafrost.更多还原