上海国土资源
上海國土資源
상해국토자원
2013年
4期
25~32
,共null页
地面沉降 地下水位 冲积平原 高铁工程
地麵沉降 地下水位 遲積平原 高鐵工程
지면침강 지하수위 충적평원 고철공정
land subsidence; groundwater level drawdown; alluvial plain; high speed railway engineenng
浊水溪冲积扇是台湾水资源最为丰富但也是地面沉降最严重地区。近年来该区域的地面沉降因有可能威胁高铁行车安全而备受关注。本文整合历年累积的地下水位及地面沉降等相关监测数据,验证了地下水位变化与含水层补给之机制,探讨了地下水周期性波降条件下土层压缩特性以及高铁路堤与桩基础工程结构的沉降行为。认为对于设置桩基础的线型高架结构而言,区域性地下水位波降不致增加桥墩间的差异沉降,但桩基础若承受邻近局部的额外载重,则可能伴随地下水位波降产生持续性的差异沉降,其长期效应将对线型交通结构物的平整度及安全性造成负面影响。
濁水溪遲積扇是檯灣水資源最為豐富但也是地麵沉降最嚴重地區。近年來該區域的地麵沉降因有可能威脅高鐵行車安全而備受關註。本文整閤歷年纍積的地下水位及地麵沉降等相關鑑測數據,驗證瞭地下水位變化與含水層補給之機製,探討瞭地下水週期性波降條件下土層壓縮特性以及高鐵路隄與樁基礎工程結構的沉降行為。認為對于設置樁基礎的線型高架結構而言,區域性地下水位波降不緻增加橋墩間的差異沉降,但樁基礎若承受鄰近跼部的額外載重,則可能伴隨地下水位波降產生持續性的差異沉降,其長期效應將對線型交通結構物的平整度及安全性造成負麵影響。
탁수계충적선시태만수자원최위봉부단야시지면침강최엄중지구。근년래해구역적지면침강인유가능위협고철행차안전이비수관주。본문정합력년루적적지하수위급지면침강등상관감측수거,험증료지하수위변화여함수층보급지궤제,탐토료지하수주기성파강조건하토층압축특성이급고철로제여장기출공정결구적침강행위。인위대우설치장기출적선형고가결구이언,구역성지하수위파강불치증가교돈간적차이침강,단장기출약승수린근국부적액외재중,칙가능반수지하수위파강산생지속성적차이침강,기장기효응장대선형교통결구물적평정도급안전성조성부면영향。
The Choushui River alluvial plain (Taiwan) is a nch source of water resources. However, it suffers from a severe land subsidence problem due to unbalanced land development and excess exploitation of groundwater. In recent years, this issue has received considerable attention because land subsidence has threatened the safety of the high-speed rail network in the region. This study integrates and analyzes various data recorded over the last 10 years, and confirms the source of recharge to the 2nd aquifer and compression from the contraction of the aquifer system. It also discusses the features of soil compression and settlement behavior of geotechnical structures, including ground, embankments, and piles, caused by fluctuations in seasonal groundwater drawdown. Monitoring data indicates that the region between the ground surface and a depth of 220 m is moving in-phase with the fluctuations in groundwater level, which may affect pile capacity due to negative pile friction. An additional minor consequence, the angular displacement between piers, was noticed on a viaduct structure built on this wide, flat, agncultural alluvial plain. However, if and when the pile structures take on additional loading from the adjacent fill work, the combined effects of this extra loading and groundwater fluctuations will induce increased pile settlement. The long-term angular displacement between piers will therefore be accentuated, and lead to negative impacts on structure safety.