Numerical Simulation Of Steady-unsteady Seepage Of Earth-rock Dam And Stability Analysis Of Dam Slope

In dam construction,seepage is an important factor affecting the safety and stability of earth-rock dams.Seepage will not only cause seepage damage,cause water and soil erosion,but also reduce the strength index of the dam body,which will lead to dam body instability and even collapse.Analysis is the primary prerequisite for ensuring stable operation of the dam?In this paper,the study of the stability-unstable seepage of earth-rock dams is based on the basic theory and engineering data of seepage,and the finite element software is used to construct the seepage model to simulate the analysis of the Shitohe reservoir dam.The main research contents and results are as follows:1.The domestic and international status and basic theory of dam slope stability under seepage and seepage are elaborated.Pore pressure cloud diagram and displacement cloud diagram.The analysis results are of great significance for studying the pore pressure variation and the stability of the dam slope under the action of stable-unsteady seepage.2.Analyze the seepage field under the steady seepage of the earth-rock dam,draw the cloud map of pore pressure distribution under the steady seepage,summarize the relevant laws of pore pressure change,and the analysis result is in line with the actual situation.3.The distribution and overall stability of the unsteady seepage field of the dam body during rain and water level rise are analyzed.The results show that: the increase of rainfall intensity leads to the increase of the pore pressure of the dam top;with the increase of the water storage level,the position of the infiltration line continues to rise.Because the penetration rate lags behind the storage rate,theinfiltration line is concave curve.In addition,at the same time,the greater the water storage rate,the more obvious the hysteresis and the more significant the degree of depression;the minimum safety factors at the dead water level and the design flood level during the soaking process after the water level rises are 1.353 and 1.318,respectively.All meet the design specifications.