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为研究粉土地基中群井条件下的真空井点降水过程及降水效果,进行了现场试验。试验表明,群井条件下,随井点间距的减小和井点深度的增大,水位下降要快得多。由于群井降水具有显著的三维空间效应,所以,群井降水引起的地下水位降低要比单排井点和单井点更为显著,同时,降水引起的地下水位下降范围也更大,这一效应随井点深度的增加更为明显。由现场取得原状土样进行的室内渗透试验表明,连续抽水后,在真空和水力的双重作用下,土层中的土颗粒有明显的迁移,导致地层中土的孔隙比增大,渗透系数也明显增大。
In order to study the vacuum well point precipitation process and precipitation effect under the condition of well grouping in silt foundation, a field test was carried out. Experiments show that under well conditions, the water level drops much faster with the decrease of well spacing and the increase of well depth. Due to the obvious three-dimensional spatial effect of well group precipitation, the decrease of groundwater level caused by the well group precipitation is more significant than that of single-well and single well points. At the same time, the descending range of groundwater level caused by precipitation is also larger The effect is more pronounced with the depth of the well. The indoor infiltration tests conducted on the undisturbed soil samples from the field show that after continuous pumping, the soil particles in the soil layer migrate obviously under the double action of vacuum and water pressure, resulting in the increase of the void ratio in the soil and the increase of the permeability coefficient Significantly increased.