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基于某真空井点降水综合试验,建立了三维地下水流数值模拟模型,将模型模拟预测数据与试验观测数据进行对比,研究真空负压和井点间距对真空井点降水效果的影响,得出了真空井点周围渗流场的变化性状,提出了真空井点周围真空及重力场耦合区、耦合场与重力场过渡区和重力场区3个区的概念。得出了不同负压在不同井点深度条件下对地下水渗流场的影响变化。对比结果表明,建立的真空井点降水模拟分析方法,能够较好的模拟真空井点周围观测井水位与出水量的相关关系;分析方法可用于真空井点降水试验分析,且为真空井点降水设计提供了依据。
Based on a comprehensive experiment of vacuum well point precipitation, a three-dimensional numerical simulation model of groundwater flow was established. The simulation data of the model and experimental observation data were compared to study the effect of vacuum negative pressure and well spacing on the vacuum well point precipitation effect. The change of the seepage field around the vacuum well point has put forward the concept of vacuum and gravitational field coupling zone, coupling field, gravitational field transition zone and gravitational field zone in three zones around vacuum well point. The influence of different negative pressure on the seepage field of groundwater at different well depths is obtained. The comparison results show that the established simulation analysis method of vacuum well point precipitation can well simulate the correlation between the observation well water level and the discharge volume of the vacuum well point. The analysis method can be used for the experimental analysis of the vacuum well point precipitation and for the vacuum well point precipitation Design provides the basis.