Analysis on Stress and Deformation of Low Elastic Modulus Concrete Cutoff Wall Inside the Dam Body

摘要

Based on the simulation of a low elastic modulus concrete cutoff wall, the effect of dam constitutive model, elastic modulus of cutoff wall, the height of dam on the stress and deformation of the cut off wall is analyzed systematically. A critical value of cutoff wall's elastic modulus values is proposed, when the elastic modulus overruns the value, the stress of wall increases fast, while almost no change when the elastic modulus is lower than the value. By comparing the sensitivity of cut off wall's stress and deformation to the change of wall's elastic modulus and dam's elastic modulus, the effect of reducing the wall's elastic modulus on the stress and deformation of wall is proved to be better than the way of enhancing the dam's elastic modulus. Meanwhile by comparing the results between 2-dimensional model and 3-dimensional model, 2-dimensional model is proved to be only suitable for the analysis of middle section of the dam, while 3-dimensional model is suitable for the whole section, including the edge part.