Research on the failure characteristics of roller compacted concrete
In view of the failure characteristics of the current roller compacted concrete(RCC)gravity dam body,it uses the extended finite element numerical method to analyze the influence of the thickness of the roller compacted layer on the stress distribution and crack growth of the dam,and compares the calculation results when the overload coefficient is the same.There are nine overload coefficients from 1.04 to 3.04.The propagation law under the same overload coefficient indicates that the vertical propagation depth of cracks decreases slightly with the increase of the thickness of the compacted layer,and the vertical propagation depth is basically lower than that of normal concrete dams.Only when K=2.29 and K=2.79 are close to normal concrete dams.The compressive stress at the dam toe is close to the compressive strength of the material,indicating that the overall failure of the dam body will occur at this time,and the crack propagation direction will shift to the downstream direction;When the materials in each area of the dam approach their corresponding strength,the horizontal crack propagation speed will sharply increase,ultimately leading to the overall failure of the dam.The analysis of four models shows that the overall crack propagation depth,dam crest displacement,stress distribution patterns at the dam heel and toe are basically similar under each overload coefficient,and the dam cracks have the characteristics of brittle and sudden failure.Under the same overload coefficient,there is a small decrease in crack propagation depth and dam top displacement with the increase of the thickness of the compacted layer.
failure characteristicsroller compacted concretedam bodyfinite element analysiscrack propagation
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