Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
高鐵沿線104年度地層下陷監測辦理情形 Implementation of Land Subsidence Monitoring along HSR Routes in 2015

因應超抽地下水造成彰雲嘉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,成果均送中央及地方單位辦理地層下陷防治參考。依104年之監測結果,高鐵沿線下陷地區主要發生在彰化溪洲、雲林虎尾鎮、土庫鎮、元長鄉、北港鎮及嘉義新港鄉,104年主要下陷中心為虎尾鎮及土庫鎮路段(TK216~TK234),最大下陷量為6.6公分(TK218+465)較103年(5.1公分)增加,另嘉義太保路段104年下陷量為3公分,較103年1.1公分大,目前橋墩角變位量均小於設計容許值,經高鐵公司評估不影響高鐵結構與營運安全。經彙整高鐵彰雲路段4處下陷較顯著之彰化溪州、雲林車站、跨越158縣道及台78線快速道路等近3年下陷量及橋梁角變位量變化趨勢(如下表),目前除雲林站受雲林地區整體地層下陷影響外,其餘3處角變位量趨勢均維持穩定,高鐵結構及行車安全無虞。
為徹底解決高鐵沿線地層下陷問題,行政院已於102年5月核定實施「雲彰地區地層下陷具體解決方案暨行動計畫」(第一次修正),以減少地下水抽取,有效處理雲彰地區地層下陷問題,對高鐵雲彰路段之結構及營運安全具有正面效益。
本局將監督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,以確保高鐵結構及營運安全。

In response to the land subsidence phenomenon in Yunlin and Changhua area due to groundwater overuse, since 2003, BOHSR has been supervising THSRC to conduct annual monitoring inspections on HSR piers and report results to central and local governmental authorities for record and reference. Based on the monitoring records in 2015, areas that suffered most from this issue currently are Hsichou Township District in Changhua, Huwei Township, Tuku Township, Yuanchang Township and Beigang Township in Yunlin and Hsingang Township in Chiayi. According to 2015 records, significant subsiding sections are TK216~TK234 in Huwei and Tuku Township with maximum subsidence value of 6.6 cm at TK218+465 which was a 5.1 cm increase comparing to 2014 values. In addition, the subsidence value in Chiayi Taibao section was 3 cm, a 1.1 cm increase comparing to 2014. Via assessment by THSRC, the subsiding situation will not endanger the structural and operational safety of HSR. Currently, the angle variables of piers are lower than the allowable value indicating that the HSR structure is safe for operation. The subsiding values and angle variables in recent three years of the four significant areas, Hsichou Township, Yunlin Station District and the area crossing Yunlin No.158 Country Road and Provincial Highway No. 78, have been listed out in the following table showing increase in only Yunlin Station District due to overall subsidence in the area and the angle variables of the remaining three places remained stable ensuring HSR safety.
To eradicate the land subsidence issue along HSR routes, the Executive Yuan ratified "Specific Solutions and Action Plans Confronting Land Subsidence in Yunlin and Changhua Areas (the 1st amendment)" in 2013 May. The project has successfully reduced groundwater usage which effectively slowed down 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 HSR operational safety.

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