A 3D numerical model for flowing groundwater is built based on field vacuum well point dewatering test. Through comparison of observation data and prediction data calculated from numerical model

influences of the vacuum negative pressure and the interval among dewatering wells on the dewatering effect are studied. Variation characters of the seepage field around the vacuum well point are described; a conception of three areas

i.e.

coupled field area

transition area and gravity field area is proposed; and changing law of seepage field with negative pressure and depth of well point was obtained. Comparison results show that the numerical model can reflect the relationship between the water level in the observation well and the water yield well. This method can be used in analysis of vacuum well point dewatering test and provide a reference for practical design.