摘要
准确预测隧道涌水量是隧道工程实施的关键问题。数值法能灵活处理复杂的水文地质条件,因此成为众多隧道涌水量评价方法中应用最广的方法。以某通道工程为例,基于有限元数值模拟软件FEFLOW建立了地下水流数值模型,模型识别和验证期模拟实测的地下水位拟合良好。利用模型计算了各个隧道的涌水量,发现部分隧道处涌水量较大,而且涌水量与降雨入渗补给强度有较密切的关系。最后比较分析了数值法和地下水动力学法计算结果的差异,两者总体趋势一致,但基于理想均质模型的地下水动力学法计算结果偏大。预测结果可为工程施工和运营过程的排水方案设计提供理论依据。
Groundwater inflow forecast accurately is crucial in tunneling. Numerical solutions are most widely used among various solutions since they can deal with complex hydrogeological conditions flexibly.A numerical groundwater model for a tunnel project is set up by finite-element software FEFLOW.Groundwater table of the simulated and measured is proved fit well by model identification and verification.Predictions of the yield water volume in some tunnels are carried out by the model and some tunnels with large yield volume are found. There is a clear response between the inflow quantity and the rainfall infiltration intensity. The discrepancy between numerical modeling and groundwater dynamic analysis are compared and find that the tendency is consistent; the calculated result for ideal homogeneity model by the latter method is bigger. The prediction could provide a theoretical basis for water discharge design during tunnel excavation and later operation.
出处
《工程勘察》
2015年第11期39-43,共5页
Geotechnical Investigation & Surveying
基金
国家"水体污染控制与治理"科技重大专项项目课题"松花江傍河取水水质安全保障关键技术及示范"(2014ZX07201-010)
