本文選題：寒區(qū)隧道　切入點：保溫層厚度　出處：《巖土工程學報》2014年10期

【摘要】：新疆天山的玉希莫勒蓋隧道處于高海拔季節(jié)性凍土地區(qū),為防止凍害的發(fā)生,需要對所需保溫層厚度進行研究。針對這一問題建立計算模型,采用Laplace積分變換的方法得到了由于保溫作用而沒有相變發(fā)生時寒區(qū)隧道溫度場的解析分析方法;通過與stehfest方法對比分析,基于高斯正交法則和快速Fourier變換的Den Iseger方法具有更好的穩(wěn)定性和準確性,采用該數(shù)值反演方法進行Laplace逆變換的求解。根據(jù)對玉希莫勒蓋隧道的分析表明,保溫層、襯砌與圍巖中的溫度都隨著大氣溫度呈簡諧振動;現(xiàn)場采用的5 cm厚保溫層內外溫差達9.63℃,不能保證該隧道圍巖不發(fā)生凍脹現(xiàn)象;要保證其在設計年限內不發(fā)生凍脹所需要的最小保溫層厚度為27 cm;通過對相關物理參數(shù)的分析表明:對流換熱系數(shù)對固體介質的表面溫度的最值影響較大,但對保溫層厚度的影響較小;隨著年平均氣溫的升高所需保溫層的厚度越小,保證的安全年限越長,厚度也越大;隨著地層溫度的升高,所需保溫層厚度逐漸減小;最后對年平均氣溫和地層溫度的不同組合情況進行擬合分析,得出保溫層厚度與這兩因素的相關關系,可為該地區(qū)其他隧道的設計提供參考。
[Abstract]:The Yuximolegi Tunnel in Tianshan Mountain Xinjiang is located in the seasonal frozen soil area at high altitude. In order to prevent the occurrence of freezing damage the thickness of the required insulation layer should be studied.In order to solve this problem, the analytical analysis method of tunnel temperature field in cold region is obtained by using Laplace integral transformation method, which is compared with stehfest method.The Den Iseger method based on Gao Si's orthogonal rule and fast Fourier transform has better stability and accuracy. The numerical inversion method is used to solve the inverse Laplace transform.According to the analysis of the Yuximolegai tunnel, the temperature of the insulation layer, lining and surrounding rock is simple and harmonic with the atmospheric temperature, and the difference between the inside and outside temperature of the 5 cm thick insulation layer is 9.63 鈩，

本文編號：1693874