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Cauchy边界模拟隧道排水的关键参数率定及应用
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摘要
运用有限差分程序MODFLOW模拟隧道排水的数值模型中,常用第一类Dirichlet边界或第三类Cauchy边界来概化隧道,两种概化方法各有优劣。若使用第一类边界,即在模型中将隧道设置为定水头边界,这种方法最大的缺点在于潜水面低于隧道标高情况下,隧道将成为补给项,这明显不符合实际;而若使用第三类边界,通常是使用Drain来概化隧道,它避免了第一类边界的错误,但其中的关键参数——排水系数(CD)的赋值一直存在较大的不确定性。本文分别在渗透性均质/非均质含水层条件下,进行隧道涌水动态模拟的数值试验,隧道被概化为第三类边界,将第一类边界条件下取得的涌水量作为观测值,利用UCODE程序率定了排水系数,并提出了多级率定的参数反演方案。以重庆万州走马岭隧道为例,根据实测的隧道涌水量观测数据,反演了隧道各段的排水系数值,验证了多级率定方法的可行性。本文的研究可为隧道工程地下水数值模拟以及隧道涌水量超前预报等工作提供一定的科学指导。
Numerical model of using finite difference program MODFLOW to simulate tunnel drainage,the usual use first class-Dirichlet boundary or third class-Cauchy boundary to generalized tunnel and two generalized methods have advantages and disadvantages.If you use the first boundary,that the tunnel will be set to Constant Head boundary in the model,the biggest drawback of this method is that the tunnel will be a supply item when the water table is below the lower elevation of the tunnel,this is obviously not realistic.If the use of the third boundary,the usual use Drain to generalize tunnel,which avoids the mistakes of the first boundary,but one of the key parameters-Drainage coefficient(CD)assignment there has been greater uncertainty.Firstly,paper carry out dynamic simulation tunnel gushing numerical experiments to demonstrate the drainage rate coefficient fixed method in the permeability homogeneous/heterogeneous aquifer conditions.The Paper presented a method of multilevel times inversion,which were proved the feasibility by numerical experiments.Then,taking Chongqing Wanzhou Zoumaling tunnel for example,according to the measured inflow tunnel observational data,the inversion value of each segment of drainage tunnels.This study may provide scientific guidance for tunnel numerical simulation of groundwater and tunnel inflow ahead of forecasts etc.
引文
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