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青藏公路熱棒制冷工程(Heat Pipe Subgrade in Permafrost Regions)
來源:西安中交公路岩土(tu)工程有限責(ze)任公司   發布時間:2013/7/1   瀏覽(lan)次wen)font color="#FF0000">


  青藏公路穿越數百公里的(de)多年凍土(tu)地區。周而(er)復始的(de)凍融循(xun)環所導致基(ji)底(di)的(de)不均勻變形及其帶來的(de)路面、橋涵等構造物的(de)破壞,多年來一直(zhi)是青藏公路建設和管養過(guo)程中最大的(de)技術難題。

  公司技術人員在進(jin)行(xing)路基(ji)科(ke)研(yan)試驗和施工中,除(chu)采用(yong)通風路基(ji)、碎(sui)石邊(bian)坡、遮(zhe)陽板等先進(jin)技術手段外(wai),還在高溫(wen)、高含冰量路段采用(yong)了無(wu)動(dong)力熱棒制冷技術,即利用(yong)封閉管體(ti)中液態與(yu)氣態轉換散熱原理將凍土(tu)地層中的(de)熱量傳輸至(zhi)大氣中,降(jiang)低(di)多年凍土(tu)溫(wen)度,防止(zhi)多年凍土(tu)上(shang)限下移,有xing)?gai)善了多年凍土(tu)路段地基(ji)土(tu)體(ti)的(de)力學特征。青藏公路楚瑪爾河(he)高平原K2937+100~K2939+160、K2947+500~K2951+100兩段wen)坊ji)沉降(jiang)變形和縱向裂縫十分嚴重,采用(yong)熱棒制冷技術處治(zhi)後已使用(yong)三年,效果良好。大規(gui)模采用(yong)熱棒制冷技術解決多年凍土(tu)地區路基(ji)穩定問(wen)題,在我國尚屬首(shou)例,並(bing)為青藏公路建設所采用(yong)。

  Qinghai-tibet highway runs through the permafrost area of several hundred kilometers. The ununiformity deformation of subgrade bottom caused by repeated frost-and-thaw cycle and the breakage to the structures such as road surface, bridge and culvert have been  all along the most difficult technology problem for many years.
In scientific research test and construction, in addition to using advanced technology means such as ventilation subgrade, macadam side slope, sunshading board, the professionals of the company adopt
the no-power hot stick cooling technology in the road section with high temperature and high ice content, namely: transforming the heat in frost soil layer to the atmosphere in light of the cooling theory of liquid-and-gas conversion in closed pipe so as to decrease permafrost temperature and to prevent the upper limit of permafrost from moving downward, this technology effectively improves the mechanics feature of subgrade soil in permafrost road section. The subgrade of K2937+100~K2939+160 and K2947+500~K2951+100 sections of Chuermahe high plain in Qing Zang highway had serious settlement deformation and longitudinal crack, after treatment by hot stick cooling technology three years ago, it is still in good condition. This is the first example of using hot stick cooling technology on a large scale to solve the subgrade stability problem in permafrost area, and it was adopted in construction of Qing Zang highway.

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