多年冻土区高速公路路基新结构工程示范研究

Demonstration Study on New Structural Engineering of Expressway Subgrade in Permafrost Region

为研究适用于多年冻土区高速公路的路基调控结构,对片块石-通风板复合路基、强制弥散式通风路基、通风管路基、单向导热路面-片块石路基4种新型结构,依托共玉高速公路进行了宽12.25m的分幅示范研究。依托花大高速公路,对填土路基进行了宽24.5m的整体式路基示范研究。研究结果表明:5种路基结构都能满足高速公路大尺度路基的调控要求,在示范过程中对其工程可行性进行了论证,提出了每种新结构的施工关键技术和控制指标,显著提升了施工效率和质量,通过2年的通车运营,示范工程全段整体技术状况良好,5种新结构目前已在青藏高速公路勘察设计中应用。

In order to research the roadbed control structure suitable for expressways in permafrost regions,four new types of roadbed structures as block stone-ventilated plate composite roadbed,forced dispersion ventilated roadbed,ventilated pipe roadbed,single heat-conducting pavement-block stone roadbed,are studied by a 12.25m-wide demonstration study onGonghe-Yushu Expressway.And a demonstration study of thewhole embankment with a width of 24.5m is carried outonHuashixia-Dawu Expressway.The results show that all the five kinds of subgrade structures can meet the regulation requirements of large-scale subgrade of expressway.In the demonstration,the application feasibilities are discussed,and key construction technologies and controlling index are presented for each new subgrade structure,promoting the construction efficiency and quality remarkably.After 2 year's operation,the demonstration segment showed a favorable technical situation.All the 5 new subgrade structures have been applying to the investigation and design of the Qinghai-Tibet Expressway.