Finite Element Analysis Of Stress And Deformation For Plastic Concrete Diaphragm Wal

Concrete diaphragm wall is one of the major types of seep prevention methods in earth-rock dam, especially for dam reinforcement project, because of its convenient for construction and its good anti-seepage effect, concrete diaphragm wall is often used. Engineering practice shows that there are some shortcomings of general rigid concrete diaphragm wall,the main problems are:the modulus of elasticity is too high;limit deformation is too small;cracks are easily arise that reduce the anti-seepage effect,threat to the safety of dam. In recent years, because of the characteristics of smaller permeability coefficient; lower deformation modulus; can adapt to the deformation of the surrounding soil; strength increases with confining pressure improve, plastic concrete received extensive attention.Based on the above, this paper uses ABAQUS which is a universal finite element analysis software as computer tool for these studies:1. Choosing ABAQUS software as the development platform, The redevelopment procedures of the Duncan-Chang constitutive model were described. Then, the redevelopment procedures were used to analyze the stress and displacement of the plastic concrete diaphragm wall. The result validated the redevelopment procedures was successful.2. The research of stress and deformation properties of concrete diaphragm wall in static water pressure loads were taken with Duncan-Chang E-B model (including a rigid concrete wall and four different elastic modulus of plastic concrete diaphragm wall) to get the deformation and stress characteristics of these walls.3. Contrast and analysis the results, we will see the stress status of plastic concrete diaphragm wall is better than rigid concrete diaphragm wall, the tensile stress of plastic concrete diaphragm wall is reduced by the decrease of the modulus of elasticity,there is no tensile stress when its modulus of elasticity is less than certain value.4. Calculate and contrast rigid concrete wall and plastic concrete diaphragm wall with different thickness, the results show that the influence of its deformation of thickness is not obvious;the upstream side of the vertical wall stress with the wall height distribution are similar in all cases, the maximum tensile stress value of rigid walls of different thickness or different thickness of the plastic wall, however, the tensile stress value of plastic concrete diaphragm wall was significantly smaller than the tensile stress value of the rigid wall.