Experimental Study On Similar Model Of Slope Seepage In Dump Site

The solution seepage inside the loose dump is mainly caused by atmospheric rainfall.Due to the seepage effect and the seepage filtration effect produced during the seepage process,the internal pore water pressure of the dump will increase,which will affect the safety of the dump slope.In order to grasp the distribution of water pressure under the seepage of granular material slopes and the characteristics of pore water pressure as a function of the seepage time,a model of loose deposit seepage flow path was established,which revealed that the sedimentation of suspended particles under frictional resistance and gravity caused the seepage.The main reason for filtering.Based on the theory of water pressure analysis,a water pressure distribution model of the structural surface under the filtration condition is constructed,and the correction formula for slope stability coefficient is derived.Based on Bernoulli’s equation,an energy balance equation is established,and the size of the seepage path and the water pressure are given,And the coordinated change of flow rate.Through the similar model test of the seepage flow of the loose slope,the change of the head height at different positions with the number of seepage cycles and seepage time was measured.The results show that in the single material seepage experiment,the results of periodic seepage and continuous seepage are the same.At the foot position,the water pressure presents a triangular distribution with the slope bottom at a right angle.Coarse sand seepage,the water pressure is irregular trapezoidal distribution;the maximum water pressure of continuous seepage appears in the middle position,the water pressure shows an isosceles triangle distribution,obtained through regression analysis,under certain angles,the maximum water pressure and seepage time accord with the power function relationship.Periodic seepage of fine sand,the water pressure in the lower and middle areas increases in sequence with the increase of the location,the lower portion increases quickly,the middle portion increases slowly,and the upper portion is distributed in an arc shape;the continuous seepage gradually increases the water pressure in the lower portion,and the central area remains unchanged The upper part also has an arc-shaped distribution,which is obtained through regression analysis.At a certain angle,the maximum water pressure and seepage time accord with a negative exponential function.In the mixed material percolation experiment,the percolation effect of the mixed three type experiment is the most obvious.The mixedtype cycle and continuous water pressure distribution are "upper triangles";the mixed-type cycle water pressure distribution is "middle-upper triangle",and the continuous water-pressure distribution is "mid-upper arc";the mixed three-cycle water pressure is "upper" "High,low and low bimodal" distribution,continuous water pressure is "up,low,high,and high bimodal" distribution;mixed type 4 periodic water pressure is "triangular",continuous water pressure is "triangle at the bottom of the slope";mixed five The periodic and continuous water pressures are distributed in a "triangular" shape;the mixed six type periodic and continuous water pressures are distributed in an "up,down,high,and double peak type" distribution,but the upper part is arc-shaped.According to the similar model test of the dump site slope,the corresponding numerical model is established,and the seepage simulation calculation and stability calculation are performed respectively.The influence of the seepage flow on the slope hydraulic pressure and stability is explored.It is recommended that the dump be constructed according to the mixed type.In order to improve the slope stability of the dump site,the slope seepage is analyzed and studied from the microscopic pores.Three measures to improve slope stability are proposed,including segregation and pile construction,stress wave action,and horizontal dredging and drainage.Solved the problem.The mixed-type slope is constructed with drainage model,and then seepage simulation calculation is performed.Through comparison,it is found that dredging drainage can obviously improve the slope safety and has an important effect on improving the slope stability.