Numerical Analysis Of Highway-slope Seepage And Its Engineering Application

Highway-slope seepage will cause changes in soil saturation,pore water pressure,and effective stress,which will reduce slope stability and lead to landslide disasters.Therefore,research on slope seepage is of great significance in preventing and controlling landslides.In this paper,the slope of Fengxi Avenue is taken as an example.The meshless junction method is used to analyze the slope seepage in the case of a sudden drop in water level.The stability of the slope is analyzed using the finite element software ANSYS.Using meshless method to analyze the seepage of highway-slope,this paper mainly does the following work:(1)The meshless method is used to derive the discrete system equations for Poisson’s equations similar to the seepage equation,and then the three typical calculations of Laplace’s equation,Poisson’s equation,and Helmholtz equation The example is solved,and the results are compared with the analytical solution.It is found that the meshless intermediate point method is better than the ordinary collocation method for solving Laplace,Poisson,and Helmholtz equations.(2)Derived the discrete system equations of the meshless method for the stable seepage equation and the unsteady seepage equation,and for the stable seepage of the homogeneous rock mass,the stable seepage of the rectangular dam,the stable seepage of the circular well,and the free surface The examples of unsteady seepage were solved,and the results of the finite element method were compared with the analytic solution.It was found that the meshless median method was feasible and feasible for solving the problems of stable seepage and unsteady seepage,and the accuracy ratio was limited.The element method is closer to the exact solution.(3)Numerical analysis of the seepage in the slope of Fengxi Avenue was made using the meshless junction method,which mainly simulated the seepage change of the slope under the condition of sudden drop in water level,and considered the seepage flow of the slope at different water level descent rates and different initial water level heights.Finally,the obtained seepage results were combined with the finite element method to study the slope stability in the case of a sudden drop in water level.It is found that when the initial descending water level is the same,the faster the water level decreases,the slower the pore water pressure dissipates in the slope,the smaller the change in head value,the smaller the magnitude of the dip line change,the slower the total head decrease in the slope,and the slope safety The faster the coefficient decreases,the greater the decline,the worse the slope stability;when the water level begins to decrease,the safety factor decreases the fastest.As the water level continues to decrease,the safety factor decreases slowly;the closer to the position inside the slope,The smaller the total head drop;when the water level drops at the same speed,the initial height of the water level is higher,the longer it takes for the water level to drop to a stable level,the longer the total head lag in the slope,the longer the total head drop,and the longer the formation,The greater the penetration force and the longer the action time,the greater the decrease in slope safety factor and the more unstable the slope.