土石坝沥青混凝土心墙力学参数反演分析

沥青混凝土的本构模型参数与试件成型方法、试验条件密切相关，具有较大的离散性，难以准确确定。利用基于免疫学原理的遗传算法与有限元计算理论，建立了土石坝力学特性参数的反演分析方法，并编写了相应的计算程序。结合三峡茅坪溪沥青混凝土心墙堆石坝工程，利用竣工期坝体填筑现场原型监测资料，对心墙沥青混凝土的Duncan模型参数进行了反演计算。利用139 m水位的原型监测资料验证了反演成果的合理性，对沥青混凝土力学参数的合理确定提供了一条有效途径。

Back analysis of mechanical parameters for asphalt-concrete core earth-rock dam

Parameters of asphalt concrete are related to the shaping method of specimen and test condition, therefore, the parameters are rather discrete and difficult to determine accurately. Based on immune GA and FEM, back analysis method is established to search for material parameters of earth-rock dam; and the corresponding calculation program is compiled. Combining with Maopingxi asphalt concrete core rockfill dam of Three Gorges Project, using monitoring data of the dam in the period of completion, parameters of asphalt concrete core of Duncan-Chang constitutive model are inversed. By the original monitoring information during the water level 139 m, the rationality of back analysis results is proved; an effective approach to determine the mechanical parameters of asphalt concrete is provided.