调蓄式渗井非饱和渗透排水影响因素分析

Analysis of Influencing Factors on Unsaturated Drainage of Regulation-Storage Style Seepage Well

为探讨公路下挖通道排水中浅层渗井的使用性能,利用SEEP/W软件模拟调蓄式渗井向非饱和带岩层的排水过程,并分析井深、井径、渗水段长度及渗水岩层土水特性等参数对井流量的影响。研究发现,井流量与这些参数均成正相关关系,其中渗水层渗透系数最敏感,其次为井深、井径和渗水段长度;井深设置到潜水面之上2m左右处,渗井性能最优;井流回灌过程中,非饱和带岩层径向影响范围为1～2倍井深,渗井排水结束后再经过1/2排水时间,渗水层中水丘基本消散,仅在渗井周围残留有局部滞水带。

To study the unsaturated drainage of the regulation--storage style seepage well in highway drainage, SEEP/W is used to simulate the seepage process. And the impacts of the well depth, diameter, seepage length and permeability to well flux are analyzed. It is found that the well flux are positively rela- ted to these parameters, while the permeability of seepage layer is the most sensitive, followed by well depth, well diameter, and seepage length; When the depth is set at about 2 m above the water table, seep- age wells performance is optimal; In the infiltrating process, the radial influence extent of groundwater to unsaturated aquifer is 1 to 2 times of well depth; For 1/2 drainage time after the end of the drainage, the water dune in Seepage layer is basically dissipated, only a local aquiclude is resided around the seepage well.