基于区域数值模拟的抗浮水位研究--以石家庄地铁1号线二期为例

Research on Anti-floating Water Level Base on Regional Numerical Simulation--Take Phase Ⅱ of Shijiazhuang Metro Line 1 as an Example

抗浮水位的取值对工程安全和工程造价影响巨大。以石家庄地铁1号线二期为例,在充分分析区域水文地质条件的基础上,通过GMS软件中的modflow模块并依据水均衡分析参数进行建模。基于校正后的模型,综合考虑各种不利因素(尤其是南水北调和黄壁庄水库泄洪对地下水位的影响),预测得出各车站最高地下水位为51.2~56.0 m。模型预测结果显示,由于距离滹沱河较近,东庄站、西庄站地下水位在极端降雨当年就出现大幅抬升;东上泽站、东洋站位于农业开采区且距离滹沱河以及城市集中开采区相对较远,将在极端降雨的第二年出现最高水位。最后,根据结构与含水层关系,确定了各车站的基底浮力压强为0~70 kPa。

Taking phase Ⅱ of Shijiazhuang metro line 1 as an example,the conceptual model of hydrogeology in the study area is established by GMS software according to the parameters obtained from water balance analysis on the basis of fully analyzing the hydrogeologic conditions of the study area.Based on the corrected model and considering the influence of various uLfavorable factors,especially influence of South-to-North Water Transfer and flood discharge of Huangbizhuang Reservoir on groundwater level,the maximum groundwater level of each station is predicted to be 51.2-56.0 m.The prediction results show that the groundwater level of Dongzhuang station and Xizhuang station rises sharply in the year with extreme rainfall because they are close to Hutuo River;Dongshangze station and Dongyang station are located in the agricultural mining area and relatively far away from Hutuo River and urban concentrated mining area,thus the highest water level will appear in the year after extreme rainfall.Finally,the buoyancy pressure of the basement is determined to be 0-70 kPa according to the relationship between structure and aquifer.