多年冻土区路基的结构设计分析

研究目的:本文从分析冻土区路基表层的冻胀特征和底层的融沉特征入手,提出路基结构设计中冻土区路基表层的防冻胀措施以及低含冰量冻土和高含冰量冻土路基的防热融措施。研究结论:认为按地质和地温条件处理冻土,保持多年冻土上限不下降后,路基结构按“封闭系统”冻结条件进行设计,表层冻融层内用不冻胀的粗粒料填筑,其它部分按常规路基设计,即可满足多年冻土区路基结构功能的要求。

Analysis of Structure Design of Subgrade in Permafrost Region

Research purposes: The anti-frost heaving measures for the surface of subgrade in permafrost region and the anti-heat thawing measures for the subgrade of poor and rich ice frozen soil are put forward based on the analysis of the characteristics of surface frost heaving and bottom thawing of subgrade in permafrost region. Research conclusions:It is believed that the requirements of structural function of the subgrade in permafrost region can be satisfied by making design of subgrade structure in accordance with the frozen condition of "enclosed system",filling the active layer on the surface by unfrozen coarse materials and making design of the rest parts of the subgrade like(ordinary) subgrade,after the permafrost is treated in accordance with the geological(conditions) and ground temperature condition and upper limitation of permafrost is no longer lowering.