Determination of the phreatic-line under reservoir drawdown condition

It has been proven that the groundwater plays a fateful role in the safety factors of slopes. However, in the design of the slope stability in the Three Gorges Reservoir Zone (TGRZ), the methods adopted for determining the ground water table and hydrodynamic forces during reservoir drawdown are mostly empirical and vary from one project to another. To improve the methods, a simplified formula of the phreatic-line in landslide mass was proposed during reservoir drawdown in this article, based on the Boussinesq’s differential equation of unsteady-seepage, and )