筑坝堆石料的UH模型修正

A modified UH model for rockfill materials

对堆石料的UH模型进行了不同应力路径的适应性验证,结果表明,该模型在反映堆石料等比例加载时与试验规律存在一定误差,分析认为,原始UH模型的剪胀特征线假定不符合堆石料的变形规律。文中采用了新的塑性势面将原始的UH模型改进为服从非关联的流动法则,修正后的模型对各个应力路径的预测精度明显提高。按照类似的方式,对堆石料的UH动力模型进行了修正,并将修正后的UH动力模型用于预测花岗岩堆石料在循环剪切荷载下的累计变形现象,模型预测结果与试验规律能够较好吻合。

The original UH model for rock-fill materials via different stress path tests is validated in thispaper. The results show that, there is a certain error between the experimental data and model predictionsin the constant stress ratio paths,and the characteristic line of the original model can not reflect the practi-cal deformation law of rockfill materials. A new plastic potential surface is used to modify the UH model,which obeys a non-associated flow rule. The modified model has been improved markedly in predicting rock-fill materials behaviors under different stress paths. In a similar manner, the UHD model is also modifiedto predict cyclic loading behaviors of granite rockfill materials. The results of model prediction agree wellwith the experimental laws.