本研究主要在了解土壤之受凍行為，並以數值分析找出有效、經濟之施工措施。輸電線路建設工作因都會環境變化，有些經過市區之輸電線路須地下化，而採用潛盾工法施工，建造大深度(如20~50公尺深)和大斷面之洞道，供電力電纜及其附屬設備佈設。為確保大深度潛盾工法於工作井之發進、到達，以及地中接合和連絡通道施工之順利安全，同時對高土壓、高水壓及地下水滲流影響之掌握，台電公司於2009年開始，引進土壤冰凍工法於地下電纜洞道工程之建設。本研究除對土壤冰凍工法進行文獻回顧，了解其原理與施工運轉實務外，並洽請施工廠商提供密閉式鹵水循環系統，以及LN開放式土壤冰凍工法系統之相關工程資料。還對採用密閉式循環系統工法工程進行程序、結果及進行中應注意事項進行了解分析，對採用LN開放式系統土壤冰凍工法之工程，則以PLAXIS數值分析軟體，進行各種不同邊界情境條件之冰凍效果模擬分析。經分析結果檢討，得知邊界之隔熱條件對冰凍效果影響很大，故需於施工前，以數值分析進行各種不同隔熱邊界條件分析，以確保土壤冰凍工法之經濟有效，以確保凍土之順利完成。

This study is to understand the frozen behavior of soil, and to find out the numerical analysis of effective, economical construction measures. Transmission line construction due to the establishment of environmental changes, Gradually some underground transmission lines should be built using dive shield construction depth (such as 20 to 50 meters deep) and the large section of the tunnel for the power cable and its ancillary equipment layout. In order to ensure that the depth of the dive method in the work of the development, arrival, ground connection and contact channel construction smooth and safe. The control of high earth pressure, high water pressure and water seepage should be controlled. Taipower began in 2009 to introduce soil freezing works in cable tunnel construction. In addition to the study of soil freezing method, this study is to understand the principle and construction practice. And consult with Taipower and its construction manufacturers to obtain the relevant information of the soil freezing method using the closed brine circulation system and the LN open system. This study analyzes the procedures, results and the precautions to be carried out in the closed loop system engineering project. The frozen effect analysis of various boundary conditions was carried out by using PLAXIS numerical analysis software for LN open system soil freezing engineering. After reviewing the results of the analysis, it was found that the insulation conditions of the boundary had a great influence on the freezing effect. Before the construction, numerical analysis need to be carried out to analyze the various insulation boundary conditions, and economically effective insulation measures are adopted to ensure the smooth completion of the frozen soil.

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