發(fā)布時(shí)間：2018-03-17 08:49

  本文選題：多年凍土　切入點(diǎn)：保溫板　出處：《冰川凍土》2014年04期 　論文類型：期刊論文

【摘要】：高速公路路基幅面寬度的成倍增加,瀝青路面的吸熱效應(yīng)更為顯著,工程對(duì)其下伏多年凍土的熱影響更為顯著.熱棒、熱棒保溫板復(fù)合結(jié)構(gòu)等傳統(tǒng)工程措施能否保護(hù)寬幅高速公路下凍土穩(wěn)定是一個(gè)亟待回答的問題.根據(jù)帶相變熱傳導(dǎo)有限元方法,對(duì)共和-玉樹高速普通路基、熱棒路基和熱棒保溫板復(fù)合結(jié)構(gòu)路基在未來全球變暖情形下的地溫場(chǎng)特征進(jìn)行了數(shù)值模擬分析.結(jié)果表明:在年平均氣溫為-3.5℃或地表年平均溫度為-1℃的多年凍土地區(qū),普通路基和熱棒路基在全球變暖條件下路基下伏凍土都將發(fā)生融化,寬幅公路路基將會(huì)產(chǎn)生顯著融沉變形,不能保證寬幅公路路基20 a使用期內(nèi)的穩(wěn)定性.熱棒保溫板復(fù)式結(jié)構(gòu)顯示了較好的冷卻路基效果,在第20年路基下多年凍土人為上限高于原天然上限,路基下富冰凍土仍處于凍結(jié)狀態(tài),可以保證寬幅瀝青公路在服務(wù)期內(nèi)的熱穩(wěn)定性.
[Abstract]:As the width of highway embankment increases exponentially, the heat absorption effect of asphalt pavement is more significant, and the thermal effect of engineering on its underlying permafrost is more significant. It is an urgent question whether traditional engineering measures such as thermal insulation board composite structure can protect the stability of frozen soil under wide width expressway. According to the finite element method of heat conduction with phase change, this paper deals with the Gong-Yushu high-speed ordinary roadbed. The characteristics of geothermal field in the future global warming are simulated and analyzed. The results show that in permafrost regions where the annual mean temperature is -3.5 鈩，

本文編號(hào)：1624018