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

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Frontiers of Structural and Civil engineering 2023年第7期17卷 1047-1059页

作者： Shuangjie WANG Qi ZHANG Yuanhong DONG Kun YUAN Binhua HU Huilong ZHAO Nanlu ZHAO CCCC First highway Consultants Co. Ltd.Xi’an 710065China State Key Laboratory of Road engineering safety and Health in Cold and High-Altitude Regions Xi’an 710065China qinghai huashixia permafrost highway engineering safety national observation and research station Xi’an 710065China

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 *** 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 *** 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 ***,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 ***,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 *** findings would provide a reference for construction of expressway embankments in permafrost regions.

关键词： warm permafrost expressway ventilation embankments temperature field

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permafrost degradation along the qinghai-Tibet highway from 1995 to 2020

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Advances in Climate Change research 2023年第2期14卷 248-254页

作者： Zhi-Zhong SUN Wei MA Gui-Long WU Yong-Zhi LIU Guo-Yu LI State Key Laboratory of Frozen Soil engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Da Xing'anling observation and research station of Frozen Ground engineering and Environment Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesJagdaqi 165000China Beiluhe observation and research station on Frozen Soil engineering and Environment in qinghaieTibet Plateau Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesGeermu 816000China

permafrost degradation significantly affects engineering infrastructure,hydrologic processes,landscape and geomorphic processes,ecosystems and carbon cycling in cold *** permafrost degradation along the qinghai–Tibet highway(QTH)on the qinghai–Tibet Plateau,China,introduces an adverse effect on the deformation of the highway *** present,observation of a long series of ground temperatures is *** 1995 to 2020,a monitoring system of ground temperature in 10 natural sites along QTH was built and *** temperatures at different depths were continuously observed *** this study,permafrost changes along QTH were quantitatively investigated based on these *** main results showed that both the permafrost table depth(PTD)and ground temperature at different depths exhibited an increasing trend from 1995 to 2020 with widespread spatiotemporal *** higher the annual mean and range of PTD were,the higher the increase rate in *** increase rates in PTDs in the warm permafrost regions were 6.18 cm per year larger than those in the cold ***,the increase rates in ground temperature decreased with the increase in depth at each *** different depths,the smaller the mean annual ground temperature(MAGT)was,the larger the increase rate in the permafrost *** larger the range of ground temperatures was,the bigger the increase rate in the permafrost *** a depth of 6.0 m,the increase rate in the ground temperature in cold permafrost regions was twice that in warm permafrost *** on the magnitudes and differences in permafrost degradation along QTH is necessary for the design of effective adaption strategies for engineering construction and environment protection in permafrost regions under climatic warming.

关键词： permafrost table depth permafrost temperature permafrost degradation qinghai-Tibet highway qinghai-Tibet Plateau

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Temporal and spatial variations of the active layer along the qinghai-Tibet highway in a permafrost region

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Chinese Science Bulletin 2012年第35期57卷 4609-4616页

作者： LI Ren ZHAO Lin DING YongJian WU TongHua XIAO Yao DU ErJi LIU GuangYue QIAO YongPing research station on Cryosphere of qinghai-Xizang(Tibet)Plateau Lanzhou 730000China State Key Laboratory on Cryospheric Sciences Lanzhou 730000China Cold and Arid Regions Environmental and engineering research Institute Chinese Academy of SciencesLanzhou 730000China

Using monitored active layer thickness(ALT) and environmental variables of 10 observation fields along the qinghai-Tibet highway in permafrost region of the qinghai-Tibetan Plateau(QTP),a model for ALT estimation was *** temporal and spatial characteristics of the ALT were also *** results showed that in the past 30 years ALT in the study region increased at a rate of 1.33 cm *** at the upper limit of permafrost and at 50 cm depth,along with soil cumulative temperature at 5 cm depth also exhibited a rising *** heat flux increased at a rate of 0.1 Wm-2 *** the above changes demonstrated that the degradation of permafrost happened in the study region on the *** initial thawing date of active layer was advanced,while the initial freezing date was *** number of thawing days increased to a rate of 1.18 *** variations of active layer were closely related to the permafrost type,altitude,underlying surface type and soil *** variations were more evident in cold permafrost region than in warm permafrost region,in high-altitude region than in low-altitude region,in alpine meadow region than in alpine steppe region;and in fine-grained soil region than in coarse-grained soil region.

关键词：多年冻土区青藏公路空间变化时间活性层多年冻土地区高寒草甸地区活动层厚度

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Characteristics of thawed interlayer and its effect on settlement beneath embankment in permafrost regions--A case study for the qinghai-Tibet highway

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research in Cold and Arid Regions 2017年第5期9卷 447-454页

作者： ZhiZhong Sun HongLei Wang WenJie Feng YongZhi Liu ShuJuan Zhang State Key Laboratory of Frozen Soil engineering Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China University of Chinese Academy of Sciences Beijing 100049 China Beiluhe observation and research station on Frozen Soil engineering and Environment in qinghai-Tibet Plateau Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China

Based on ground temperatures and deformations monitored at the Xieshuihe site along the qinghai-Tibet highway(QTH)in permafrost regions from 2004 to 2015,variation of artificial permafrost table(APT),maximum frozen depth(MFD),thawed interlayer thickness(TIT)and ground temperature beneath embankment is analyzed,*** results indicate that under the embankment,the change of APT occurred from October to December of that year and presented a deepening *** change of MFD occurred from April to June of that year with no obvious change trend,and TIT had an increasing trend year by year,which mainly resulted from the deepening artificial permafrost *** annual ground temperature at 0.5 m depth was 3.91°C higher beneath the embankment center than that under the natural *** rising ground temperature at shallow layer of embankment resulted in the development of thawed interlayer beneath the embankment and warming of underlying *** settlement is closely associated with *** settlement easily occurs when permafrost with higher ice content exists under the thawed interlayer,and in turn the settlement is smaller when permafrost with lower ice content exists under the thawed interlayer.

关键词： thawed interlayer embankment in-situ monitoring settlement qinghai-Tibet highway

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