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基坑疏干抽排地下水数值模拟研究分析
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摘要
随着近年来工程建设规模的扩大,高层、超高层建筑不断涌现,深大基坑越来越多,施做基坑支护、止水帷幕进行基坑降水时,由于地下水的渗流作用,基坑外地下水又会以绕流的方式补给坑内,形成抽排水-补给-再抽排水-再补给的循环模式,不可避免的对周围环境产生影响,准确的预测由于基坑疏干抽排水对周围环境产生的影响并及时的采取措施已显得十分必要。本文以天津市某基坑为例,采用水力学理论计算及大型数值模拟软件ProcessingModflow建立水文地质模型进行基坑疏干抽排水模拟分析论证,模拟在疏干抽排水条件下基坑周边环境的实时变化,结果表明数值模拟与后期监测数据吻合较高,能够较为真实的反映降水过程对周边环境的影响,对基坑工程疏干抽排水具有较强的指导作用。
With the expansion of the scale of construction in recent years,high-rise,high-rise buildings continue to emerge,there are more and more deep pit,the facilities to do excavation,foundation pit dewatering when sealing curtain conduct,due to seepage of groundwater,Pit outside groundwater will flow around manner recharge pit,formed drainage pumping-recharge-pulls out drainage-resupply cycle mode,the inevitable impact to the surrounding environment,due to the accurate prediction of foundation pit dewatering and drainage pumping around affect the environment and to take timely measures have become necessary.Taking a foundation pit in Tianjin as the research project,the authors established a three dimensional coupling model between groundwater flow and land subsidence by the Processing Modflow numerical simulation software.The real time change of the underground water level and land settlement around the pit was simulated when the foundation pit dewatered and drained in case of the construction of supporting,water proof curtain.The results are in good agreement with the latter monitoring data,which can reflect the influence of the precipitation process to the surrounding environment,and has a strong guiding role in the construction of drainage and engineering disaster prevention..
引文
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