Numerical Simulation And Controlling Research On Unsteady Seepage Foundation Pit With Highly Permeable Bottom

The seepage controlling is the key factor that has great influence on the safety of foundation pit and the structure's settlements nearby. Especially when foundation pit with high water level has strong permeable bottom, it should be considered leading way, namely dewatering-recirculation system , instead of using stream closure which require overmuch cost or cannot be carried out. By using suspended seal diaphragm wall and pumping inside of pit -douching outside of pit, the dynamic balance of pit seepage can be achieved, and not only the water level in the pit can be achieved but also the water level outside the pit can be kept original position.Based on the basic equation for 3-D unsteady seepage flow, this paper analyzed 3-D unsteady seepage field. By changing the values of vary parameters, the effects of the parameters on the dewatering can be obtained by a large mount of calculations on seepage on foundation pit excavation. Simultaneity, this paper discovers some rules of the unsteady seepage and gets some valuable results for designing the scheme of excavating foundation pit.