Study of the Groundwater Drainage Effects of a Drainage Well in Landslides

The effects of drainage well work, a construction method used to prevent landslides, were studied and the following results obtained.(1) To understand the groundwater drainage effects of installing a drainage well on a sloping slide area, it is necessary to study the drainage caused by the drainage boring in addition to the drainage caused by the drainage well itself.(2) The study confirmed that after installing a drainage well, the groundwater level is low close to the drainage well but rises as the distance from the drainage well increases.(3) The overall decline in the ground water level accompanying the construction of the drainage well can be found using formula (1).(4) The decline in the ground water level accompanying the construction of the drainage well is limited to the area where drainage boring has been performed.