Full-scale site evaluation of ventilation expressway embankments underlain by warm permafrost along the Gonghe−Yushu Expressway  

作　　者：Shuangjie WANG Qi ZHANG Yuanhong DONG Kun YUAN Binhua HU Huilong ZHAO Nanlu ZHAO 

机构地区：[1]CCCC First Highway Consultants Co.,Ltd.,Xi’an 710065,China [2]State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions,Xi’an 710065,China [3]Qinghai Huashixia Permafrost Highway Engineering Safety National Observation and Research Station,Xi’an 710065,China

出　　处：《Frontiers of Structural and Civil Engineering》2023年第7期1047-1059,共13页结构与土木工程前沿（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(No.2019QZKK0905);CCCC Scientific and Technological Research Program(Nos.2021-ZJKJ-01,2022-ZJKJ-PTJS08,2022-ZJKJ-PTJS07,2020-ZJKJPTJS04,2020-ZJKJ-QNCX09,and 2020-ZJKJ-PTJS12)。

摘　　要：Ventilation embankments,including those with forced ventilation,natural ventilation,and combination of these,were adopted for the construction of the Gonghe−Yushu Expressway in warm permafrost areas.To evaluate the actual thermal performance of ventilation embankment in the Qinghai−Tibet Plateau,four types of ventilation embankments were selected as objects,and their long-term thermal characteristics were analyzed based on monitoring data.It was found that:1)under the strong scale effect of a wide embankment,the crushed-rock embankment(CRE)was warming up and the permafrost table was declining year by year.Meanwhile,the combined ventilated slab and CRE and ventilated ducts embankment can effectively decrease the ground temperature and raise permafrost table in the year with a colder winter;2)transverse temperature difference caused by the shady–sunny slope effect existed in all the four embankments.However,it was weakened by the combined ventilated slab and CRE and the ventilated ducts embankment due to their stronger cooling effect;and 3)the pre-existing embankment had a remarkable thermal disturbance to the adjacent newly-built embankment,so a reasonable embankment spacing should be considered in practical engineering.These findings would provide a reference for construction of expressway embankments in permafrost regions.

关 键 词：warm permafrost EXPRESSWAY ventilation embankments temperature field 

分 类 号：U41[交通运输工程—道路与铁道工程]