Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
高鐵沿線103年度地層下陷監測辦理情形 Implementation of Land Subsidence Monitoring along HSR Routes in 2014
高鐵與台78號快速道路跨交處路堤移除改高架橋梁

因應超抽地下水造成雲彰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。依103年之監測結果顯示,目前高鐵雲彰路段下陷較顯著之彰化溪州、雲林虎尾車站特定區、跨越雲158縣道及台78線快速道路等4處,除台78號快速道路處因路堤移除後地層回脹沉陷減少外,其餘3處下陷量略微增加,但影響高鐵安全主要為差異沉陷(相鄰墩柱角變量),以高鐵沿線下陷最嚴重路段之高鐵與台78號快速道路跨交處而言,依台灣高鐵公司提報高鐵墩柱之角變量,已由0.76/1,500(102年)減緩為0.63/1,500(103年)),均在高鐵設計規範規定之容許值1/1,500範圍內,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,行政院先後於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」(第一次修正)及「黃金廊道新方案暨行動計畫」,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,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, BOHSR has been supervising THSRC to conduct annual monitoring inspections on HSR piers since 2003. Based on the monitoring records in 2014, areas suffering most from this issue currently are Hsichou Township District in Changhua, Huwei Township in Yunlin and the four places crossing Yunlin Country highway 158 and Provincial highway 78. Among the four places with significant subsidence, one of the areas showed less subsidence due to embankment removal of that certain area. However, the remaining three places showed increase in land subsiding. Looking at the differential settlement statistics (angle variables of adjacent piers) which is the major index to measure HSR operational safety in this matter, even the most significant subsiding area at the intersection of HSR route and Provincial highway 78 showed 0.63/1,500. This number showed decrease comparing to 0.76/1,500, which was measured in 2013. Both measurements in 2013 and 2014 were within the allowable value, 1/1,500, indicating that the HSR structure is safe for operation.
To eradicate the land subsidence issue along HSR routes, 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 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.

  • 高鐵與台78號快速道路跨交處路堤移除前
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