Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
彰雲嘉地區高鐵沿線地層下陷防治辦理情形 Implementation of Land Subsidence Prevention along HSR Routes in Changhua, Yunlin and Chiayi

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。依據105年之監測結果,高鐵彰雲路段下陷較顯著4處之近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,另105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5.1公分(TK218+465)較104年6.6公分減少,另嘉義朴子溪北岸段105年下陷量為1.2公分,較104年3.1公分減少,目前橋墩角變位量均小於設計容許值,高鐵結構及行車安全無虞。
交通部為掌控高鐵沿線地層下陷之監控情形及因應事宜,自97年成立交通部高鐵沿線地層下陷防治專案小組,提供相關機關協助推動高鐵沿線地層下陷防治工作之協調平臺,106年度第1次專案小組會議已於106年7月10日召開,依據會中經濟部水利署簡報,106年度地下水位顯著下降,預測106年度顯著下陷面積可能有增加潛勢,業請各單位妥為因應,加強地層下陷防治作為,並請台灣高鐵公司持續監測以釐清雲林車站差異沉陷原因。
本局自高鐵營運通車以來持續監督台灣高鐵公司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 Changhua, Yunlin and Chiayi areas due to groundwater extraction, 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 of land subsident prevention. Based on the monitoring records in 2016, the subsiding values and angle variables in recent three years of the four significant areas in the area have been listed out in the following table. Data showed increase only in Yunlin Station District due to overall subsidence in the area; the pier angle variables of the remaining three places remained stable. According to the records, significant subsiding sections are TK216~TK234 in Huwei and Tuku Township with maximum subsidence value of 5.1 cm at TK218+465 which was less comparing to 6.6cm in 2015. In addition, the subsidence value on the north shore of Puzi River was measured 1.2 cm in 2016, also a decrease comparing to 3.1 cm in 2015. Currently, the angle variables of piers are lower than the allowable value indicating that the HSR structure is safe for operation.
To monitor the land subsidence condition alongside HSR routes and generate response measures, MOTC established the “HSR Alongside Land Subsidence Prevention Ad Hoc Group” in 2008 to provide relevant agencies to help promote a coordination platform for HSR alongside land subsidence prevention and control work. The 1st Ad Hoc Group Meeting in 2017 had been held on July 10. According to the presentation by Water Resources Agency, MOEA, the groundwater level in 2017 is significantly lower, forecasting that the area of significant subsidence may potentially increase this year. The Agency requested the units to take appropriate measures to strengthen the land subsidence prevention and control, and requested THSRC to continuously monitor and clarify the reasons for the differential subsidence issue at Yunlin Station.
BOHSR has continuously monitored the subsiding status of HSR bridge piers since the opening of the system and will be ready carry out specific emergency measures to ensure HSR operational safety.

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