共玉高速公路多年冻土特殊路基基底处理方法研究  

Research on Special Subgrade Base Treatment method for Gonghe-Yushu Highway in Permafrost Regions

作　　者：符进 朱东鹏[1] 张会建[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司多年冻土区公路建设与养护技术交通行业重点实验室,西安市710068

出　　处：《公路》2016年第1期36-42,共7页Highway

基　　金：国家科技支撑计划;项目编号2014BAG05B01;2014BAG05B03;交通运输部重大专项;项目编号2013 318 490 010;交通运输部科技项目;项目编号2012 319 495 030

摘　　要：为了研究共玉高速公路多年冻土特殊路基基底的处理方法,建立了数值仿真模型,模拟分析了清表及不清表的冻土路基地温特征,同时结合现场试验研究进一步分析了振动压实、冲击碾压等不同压实方法在地基处理时的压实效果。研究结果表明,清表后的路基中会形成融化核,对路基长期的稳定性是不利的。多年冻土地区地基处理时不清表,可采用冲击碾压进行地基压实。与振动压实相比,多年冻土区采用冲击碾压后,压实厚度是振动压实的两倍,路基整体的压实性更好。研究结论对多年冻土区高速公路特殊路基设计及现场施工具有指导意义。In order to study base treatment method of the special subgrade along the Honghe-Yushu Highway in permafrost regions, a numerical simulation model is established, based on which the geothermal regimes of permafrost subgrade with and without surface clearance are analyzed. At the same time, combined with field test, the compaction effects of vibration compaction, impact compaction and other different methods in foundation treatment are comparatively analyzed. The results show that a thawing nucleus would be formed in the subgrade after the surface clearance has been carried out, which is unfavorable to the stability of the roadbed for a long time. When surface clearance is not adopted in permafrost region foundation treatment, impact compaction can be chosen for the compaction. Compared with the vibration compaction, after using impact roller compaction in permafrost regions, the compaction thickness is double of vibration compaction, in the meantime subgrade compaction is much better. The research conclusion in this paper would have important guiding significance in special roadbed design and construction in permafrost regions.

关 键 词：共玉公路 多年冻土区 特殊路基 基底处理 

分 类 号：P642.14[天文地球—工程地质学]