本研究目的為瞭解土壤之受凍行為，並對於以數值模擬程式進行溫度場之分析時該如何選擇分析模式及適當之輸入參數給予建議。論文中分別使用TEMP/W及FLAC3D兩種程式對雲林冰凍工法現地試驗進行模擬，以尋求最佳之模擬方式。再將此模式用於模擬捷運新莊線CK570C區段標過河段(淡水河)道岔工程之大型鏡面冰凍施工。研究中發現，程式對於邊界條件之設定不足以模擬地表溫度對凍土區之影響。使用之案例中針對土質所選擇之熱傳導係數値，只分為砂土及黏土兩種進行分析，但其模擬結果已相當理想。故由研究結果認為，這種分析方式可用來預估凍土發展之情形。本研究也對凍土之特性進行彙整，了解對凍結行為影響較大的熱學參數為：熱傳導係數、容積含水率、比熱、對流熱傳導係數。並使用TEMP/W熱學分析程式進行參數研究，發現「熱傳導係數」、「容積含水率」為影響土壤凍結情形之重要參數。

The main purpose of this study is to investigate the behavior of freezing soil and find out an appropriate input parameters for numerical analysis of freezing method in tunneling. Two programs, TEMP/W and FLAC3D, are used to analyze the in-situ freezing experiment in NYUST. It is found that TEMP/W is more appropriate for the simulation of freezing method in tunneling. Then, this research uses TEMP/W program to analyze actual freezing project of tunneling engineering, “Dao-Cha” site of mass rapid transit system in Taipei. The tunnel mirror face of “Dao-Cha” site adopted freezing method during construction stage. The analysis results showed that the boundary condition in programs can not reflect the heat of ground surface. The thermal conductivities chosen by soil types were only assorted to sand and clay to analyze these cases. The simulation results fit to the field measure quite well. As the result we can conclude that the input mode is appropriate to simulate freezing site. The investigation of freezing soil observance conduct that thermal conductivity, volumetric water content, specific heat capacity and convective heat-transfer coefficient are important parameters of thermal. Parametric study results by TEMP/W program indicate that thermal conductivity and volumetric water content of soil are two important parameters for thermal transfer.

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