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根据岩土材料Merchant、Bergers和Butterfield蠕变模型的基本形式,建立3种预测混凝土面板堆石坝蠕变沉降经验模型。以蒲石河混凝土面板堆石坝为例,采用非线性有限元方法数值模拟堆石坝的顺序填筑过程。根据堆石坝沉降现场观测数据,采用回归分析方法确定3种沉降经验模型中的待定参数,确定堆石坝的蠕变沉降随时间的变化关系。工程实践应用结果表明,所提出的堆石坝蠕变沉降经验模型具有较高的拟合和预测精度,堆石坝的蠕变沉降除与时间有关之外,还与观测点的应力状态和位置以及堆石料的变形模量有关。
According to the basic forms of creep models of geotechnical materials Merchant, Bergers and Butterfield, three kinds of empirical models of creep settlement of concrete faced rockfill dam are established. Taking Pushihe Concrete Face Rockfill Dam as an example, the nonlinear finite element method is used to simulate the sequential filling process of rockfill dam. According to the observation data of settlement site of rockfill dam, regression analysis is used to determine the parameters to be determined in the three kinds of settlement experience model to determine the relationship between the creep settlement of rockfill dam and time. The engineering application shows that the proposed empirical model for creep settlement of rockfill dam has high fitting and prediction accuracy. In addition to the time, the creep settlement of rockfill dam is related to the stress state and location As well as the modulus of deformation of rockfill material.