潛盾隧道施工引致地表沉陷之分析探討

A Study on the Analyses of Ground Surface Settlement due to Shield Tunneling

楊慕泉(Mu-Chuan Yang)

指導教授 ： 陳水龍

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2007年)

https://doi.org/10.6841/NTUT.2007.00136

摘要

本研究針對潛盾隧道施工引致之地表沉陷進行評估，以臺北捷運系統新店線CH221標工程為案例，運用有限元素法2D分析軟體－PLAXIS利用不同深度之單孔隧道斷面分析成果，建立分析程式中“隧道斷面縮減率”與經驗公式中“土壤漏失率”之對應關係。土壤漏失率為經驗方法評估潛盾隧道施工引致地表沉陷之主要變數。本研究利用此對應關係與實際案例資料進行分析比較，並針對雙孔平行隧道斷面及多孔重疊隧道斷面進行模擬分析，就地質狀況之差異、不同之分析組合及雙隧道間之空間幾何配置等影響因子加以探討，以驗證PLAXIS應用於潛盾隧道沉陷分析之適用性。本研究成果可提供後續PLAXIS使用者之參考以及經驗傳承。

關鍵字

潛盾隧道 ； 有限元素 ； 地表沉陷 ； 土壤漏失率 ； 隧道斷面縮減率

並列摘要

This study takes as its point of departure the Contract CH221 of the Hsintein Line of the Taipei Rapid Transit Systems (TRTS) to evaluate the ground surface settlement due to shield tunneling. Drawing upon PLAXIS, the Finite Element Method 2D analytic software, we employed the numerical analysis results of single tube tunnel sections with different depths to establish correlations between contraction of the tunnel lining and ground loss. Ground loss is one of the significant variables when an empirical equation is used to evaluate ground surface settlement due to shield tunneling. The correlations between contraction of the tunnel lining and ground loss were also applied to the numerical analyses of both the section of double-tube tunnels with the same elevation and the section of multi-tube tunnels with different elevation. Meanwhile, a further exploration was made of the potential factors that influence the analysis results, including the variation in the geological condition, different combination of analyses, and relative position between tunnels. The study also presents the collected cases in Contract CH221 TRTS in order to exhibit the feasibility of PLAXIS in its evaluation of ground surface settlement due to shield tunneling. The research results provide the PLAXIS users with concrete empirical examples for future studies.

並列關鍵字

Shield tunnel ； Finite Element ； Ground surface settlement ； Ground loss ； Contraction of tunnel lining

參考文獻

[25] 陳堯中、賴建宏、黃南輝、林國楨（1997），「潛盾施工引致孔隙水壓變化之量測與分析」，地工技術，第60期，第97-106頁。

[26] 黃南輝、黃奕祥、黃姿連、楊鵬飛（1997），「潛盾施工所導致之沉陷槽分析」，地工技術，第60期，第45-56頁。

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