Underground Seepage Field And Displacement Control In The City Of Qin Huang Dao

First,this article introduce the pit's environment effect by pit's dewatering and presentresearch situation. By the law of conservation of mass, the principle of effective stress and theDarcy's law as well as the equilibrium differential equations, a coupled mathematic model and itscorresponding direct coupled FDM model for the analysis of groundwater seepage and stresswere developed. The coupled characteristics of the pit's environment induced by dewateringwere analyzed by the software FLAC.The two-dimensional FDM model was applied to the computation of a case project. Theresults can be concluded.1. Vertical total stress,vertical effective stress and pore pressure before dewatering areequal value distribution along horizontal direction. After dewatering vertical total stress and porepressure become small? vertical effective pressure become big.2. Because of pore pressure changing, saturated zone and unsaturated zone distribution alsochange. Saturated zone scope change small, unsaturated zone scope change big.3. Because of pore pressure changing, soils become deformed. The regulation is that withthe distance away from pit along horizontal direction from near to far, the displacement volumebecome small. the displacement volume become small too along vertical direction.4. Because of pore pressure changing, in the position away from pit n meter, verticaleffective stress become big than preceding dewatering. And with the distance n become big, thechanging range become small. So, the displacement volume become small too.At last, the measured results compared with the numerical results that verified the feasibilityof the coupled model.