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本文运用5种不同的土石料应力应变模型,对一座高为100m的理想土质心墙坝的施工填筑、库水位升降等过程进行了数学模拟。论述了几种模型的优缺点及土石坝应力应变分析中存在的问题。计算结果表明,笔者建议的双屈服面模型,在施工期得出的变位和孔隙压力大体上与邓肯模型一致,蓄水期的计算结果比邓肯模型合理,且计算参数的测定方法类似。此外,通过比较计算后证明,双屈服面模型的两个屈服面参数r、s和弹性泊松比对计算结果影响不大。
In this paper, five different models of soil-stone stress and strain are used to simulate the process of construction filling and water level rise and fall of an ideal earth core dam with a height of 100m. The advantages and disadvantages of several models and the problems in stress and strain analysis of earth-rock dam are discussed. The calculation results show that the proposed double yield surface model is consistent with the Duncan model in terms of displacements and pore pressures obtained during the construction period. The calculation results of the storage period are more reasonable than those of the Duncan model, and the calculation parameters are similar. In addition, it is proved through comparison and calculation that the two yield surface parameters r, s and the elastic Poisson’s ratio of double yield surface model have little effect on the calculation results.