【摘要】：為揭示青藏高原東部高溫凍土區(qū)高速公路XPS保溫板路基的人為凍土上限退化規(guī)律,確保高溫凍土區(qū)路基的長期熱穩(wěn)定性,減小因人為凍土上限退化引起的路基病害,首先,利用現(xiàn)場地溫實測資料分析高溫凍土區(qū)XPS保溫板路基地溫的縱、橫向分布特征,以及路基修筑初期人為凍土上限的退化特征;然后,采用非飽和土滲流與熱傳導(dǎo)理論求解凍土水熱耦合微分方程,實現(xiàn)凍土水分場與溫度場的全耦合,進而將水熱耦合模型模擬所得溫度場與現(xiàn)場實測溫度場進行比較,以驗證該模型的正確性;并分析XPS保溫板路基在5種工況(包括填料類型、年平均地溫、路基高度、XPS保溫板鋪設(shè)位置和氣候變暖)下人為凍土上限的退化規(guī)律;最后,采用MATLAB分析影響人為凍土上限退化主要因素,進而對其進行多元線性回歸,建立高溫凍土區(qū)XPS保溫板路基人為凍土上限計算模型。研究結(jié)果表明:XPS保溫板路基左側(cè)一定范圍內(nèi)溫度比右側(cè)對應(yīng)范圍的溫度高;路基修筑初期人為凍土上限先抬升60cm,然后以10cm/年下降,凍土上限的變化導(dǎo)致深部凍土層存在一定幅度的升溫;5種工況條件下,路基人為凍土上限與時間均呈線性增加關(guān)系;影響人為凍土上限退化的2個主要影響因素為填料類型和氣候變暖;該模型可為今后開展高溫凍土區(qū)高速公路XPS保溫板路基長期變形預(yù)測與病害防治提供技術(shù)參考。
[Abstract]:In order to reveal the upper limit degradation law of XPS thermal insulation board subgrade of expressway in the eastern Qinghai-Tibet Plateau, to ensure the long-term thermal stability of the roadbed in the high-temperature frozen soil region and to reduce the roadbed disease caused by the upper limit degradation of man-made permafrost, first of all, The vertical and transverse distribution characteristics of the ground temperature of XPS thermal insulation board subgrade in high temperature frozen soil region and the degradation characteristics of the upper limit of artificial frozen soil in the early period of roadbed construction are analyzed by using the measured data of field ground temperature. The unsaturated soil seepage and heat conduction theory is used to solve the coupled differential equation of permafrost water field and temperature field, and then the temperature field simulated by the coupled model is compared with the field measured temperature field. In order to verify the correctness of the model, and analyze the degradation law of the upper limit of artificial frozen soil under five working conditions (including packing type, annual average ground temperature, roadbed height, XPS insulation board laying position and climate warming) of XPS insulation board roadbed. The main factors affecting the upper limit degradation of permafrost were analyzed by MATLAB, and then multivariate linear regression was carried out to establish the upper limit calculation model of artificial frozen soil for XPS thermal insulation board roadbed in high temperature frozen soil region. The results show that the temperature of the left side of the XPS insulation board roadbed is higher than that of the corresponding range of the right side, and the upper limit of artificial frozen soil is raised first by 60 cm at the beginning of the subgrade construction, and then by the annual decrease of the 10cm/. The change of the upper limit of frozen soil leads to a certain extent of temperature rise in deep frozen soil, and the upper limit of artificial permafrost of roadbed increases linearly with time under five working conditions. The two main factors affecting the upper limit degradation of permafrost are packing type and climate warming, and this model can provide technical reference for long-term deformation prediction and disease prevention of XPS insulation board roadbed in high temperature frozen soil region.
【作者單位】： 北京交通大學土木建筑工程學院;青海省交通科學研究院多年凍土地區(qū)公路建設(shè)與養(yǎng)護技術(shù)交通行業(yè)重點實驗室;
【基金】：supported by the National Natural Science Foundation of China (No.41271072and 51378057) Science and Technology Project of Qinghai Province(No.2013-J-770) Science and Technology Project of Shenshuo Railway Branch(No.2015-10)
【分類號】：U416.168

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1 路青虎;;青藏鐵路沿線凍土上限變化規(guī)律分析[J];中國鐵路;2011年05期

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本文編號：2267017