Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
高鐵沿線102年度地層下陷監測辦理情形 2013 Land Subsidence Monitoring Status along HSR
2003年~2013年雲林地區高鐵沿線累積下陷量圖

因應超抽地下水造成彰雲地區高鐵沿線地層下陷,本局督導台灣高鐵公司自92年起每年定期對高鐵墩柱下陷進行監測,並將監測成果送中央及地方各相關單位辦理地層下陷防治之參考。依據該公司102年水準測量評估報告,除高鐵元長、土庫路段略微增加外,高鐵彰雲路段4處下陷最為顯著的路段均呈現減緩趨勢。
高鐵沿線目前下陷最嚴重地區為高鐵與台78線東西向快速道路跨交處,雖累積最大下陷量已達78.6公分,惟下陷量已逐年遞減,且台灣高鐵公司業於100年底針對該處完成二階段之預防性補強改善作業,目前高鐵行車安全無虞。另為減輕台78線路堤對高鐵橋墩下陷影響,公路總局業依行政院交示辦理該處路堤移除及改設置高架橋梁,預訂於104年春節前完成,施工過程公路總局與高鐵公司亦同步監控橋墩下陷情形,以確保高鐵結構與營運安全。
為徹底解決高鐵沿線地層下陷問題,行政院分別於102年5月及102年12月核定實施「雲彰地區地層下陷具體解決方案暨行動計畫」及「黃金廊道新方案暨行動計畫」,期藉由減少地下水抽取,有效處理彰雲地區地層下陷問題,對高鐵彰雲路段之結構及營運安全已具有正面效益。本局將監督台灣高鐵公司持續監測高鐵橋墩下陷情形,並備妥具體應變方案,確保高鐵營運安全。

In response to the land subsidence phenomenon in Yunlin/ Changhua area due to groundwater overuse, BOHSR has been supervising THSRC to conduct annual monitoring inspections on HSR piers since 2003. Annual inspection results have all been submitted to central and local authorities as reference for land subsidence prevention measures. In accordance to 2013 Leveling Survey Evaluation Report conducted by THSRC, amongst the 4 most severe subsidence sections (see table 1), all have showed subsidence deceleration besides HSR Yuanchang section and Tuku section.
Currently, the area along HSR suffering the most from land subsidence is the intersecting section (see figure 1) of HSR and Provincial Highway 78. Although its accumulated maximum subsidence depth has reached 78.6cm, the seriousness has declined through these years. To resolve this issue, THSRC has finished a two-phase preventive strengthening improvement measure on this certain area by the end of 2011 and currently HSR operation is free from safety concerns. Moreover, to diminish the pressure from the embankment of Provincial Highway 78 against the HSR bridge pier which may further increase subsidence of the pier, the Executive Yuan held a project sitting to instruct Directorate General of Highways, MOTC to execute Provincial Highway 78 Embankment Elimination and Viaduct Construction which is scheduled to reach completion before 2015 Chinese New Year Holidays. During the construction period, Directorate General of Highways and BOHSR will continue to monitor the subsiding condition of HSR piers to ensure HSR structure stability and operation safety.
To eradicate the land subsidence issue along HSR, the Executive Yuan respectively ratified "Specific Solutions and Action Plans Confronting Land Subsidence in Yunlin and Changhua Areas (the 1st amendment)" in 2013 May and "Golden Agricultural Corridor Project" in 2013 Dec. The projects reduced groundwater usage which effectively resolved the land subsidence issue in Yunlin and Changhua areas and brought positive impact toward HSR structural and operational safety in that area. BOHSR will continue to monitor the subsiding status of HSR bridge piers and carry out specific emergency measures to ensure the operational safety of HSR operation.

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