Coupling Of Seepage Field And Stress Field Of Earth-rock Dam And Slope Stability Analysis

The seepage problem of earth-rock dam is an important factor affecting its safety and stability and economy.Due to the constraints of dam conditions and other factors,many projects,especially in the northwest desert and semi-desert areas of the construction of the earth dam project,often need to face a strong water permeability of the deep sand layer on the dam impermeable engineering geological conditions,Which makes the seepage and stability problems become one of the key problems that restrict these engineering design and construction.In this paper,combined with the water conservancy project under construction,the reservoir dam is a homogeneous earth dam.Because the abutment contains a strong permeable sand layer,there is leakage.Therefore,the numerical analysis of seepage safety is carried out to ensure the safe operation and improvement of the reservoir Engineering efficiency has important practical significance.Based on the basic theory and method of seepage and stress coupling analysis,the analysis model is established,which is based on the different anti-seepage scheme(the anti-seepage scheme),and the anti-seepage scheme is put forward.And the seepage flow and the seepage flow and other seepage flow factors are analyzed.Combined with the strength reduction method,the finite element software Abaqus is used to analyze the stability of the dam.Displacement distribution map and plastic through the location of the distribution map.The main work and achievements of this paper are as follows:(1)The idea of calculating the influence of dry and wet parameters before and after impoundment is expounded in Abaqus.In addition,the method of cutting and cutting failure of soil unit in calculation is also summarized Based on the concrete engineering example,Duncan-Chang EB constitutive model is used to simulate the water storage process after the completion of the soil,after the impoundment and considering the dry and wet parameters,and the stress field,Displacement field results were analyzed.(2)The mechanism,basic equation and finite element scheme of the coupling between the stress field of the seepage field of the soil are introduced in detail.The seepage of the earth-rock dam under different working conditions under the coupling of the seepage field and the stress field is calculated and the pore Water pressure and velocity distribution,and the specific seepage and infiltration slope are obtained,and the influence of seepage on seepage is determined to determine the reasonable design scheme.Through the establishment of seepage-stress coupling model,according to different anti-seepage program,considering the seepage-stress coupling effect,and thus determine the earth-rock dam cut-off wall depth of the abutment length of 50 m.(3)Using the finite element program Abaqus unique field variable set to achieve the strength of the reduction,the calculation of the five conditions of the most dangerous plastic through the sliding area and the minimum safety factor,and according to the specification selected under two conditions The influence of seismic inertia force is calculated,and the sliding surface of plastic penetrating zone and the minimum safety factor are obtained.