| 魏匡民,陈生水,李国英,傅中志.筑坝堆石料的UH模型修正[J].水利学报,2016,47(11):1418-1426 |
| 筑坝堆石料的UH模型修正 |
| A modified UH model for rockfill materials |
| 投稿时间：2016-04-14 |
| DOI：10.13243/j.cnki.slxb.20160363 |
| 中文关键词: 堆石料 UH模型 应力路径 循环加载 |
| 英文关键词: rock-fill materials UH model stress path cyclic loading |
| 基金项目:水利部公益性行业专项经费项目（201501035）；中国博士后科学基金项目（2015M571777）；国家自然科学基金项目（51509163，51539006）；南京水利科学研究院青年基金项目（Y316009） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| The original UH model for rock-fill materials via different stress path tests is validated in this paper. The results show that, there is a certain error between the experimental data and model predictions in 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 modified to predict cyclic loading behaviors of granite rockfill materials. The results of model prediction agree well with the experimental laws. |
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