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筑坝堆石料的UH模型修正
引用本文: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.
作者姓名:魏匡民  陈生水  李国英  傅中志
作者单位:南京水利科学研究院, 江苏 南京 210024;水利部土石坝破坏机理与防控技术重点实验室, 江苏 南京 210029,南京水利科学研究院, 江苏 南京 210024;水利部土石坝破坏机理与防控技术重点实验室, 江苏 南京 210029,南京水利科学研究院, 江苏 南京 210024;水利部土石坝破坏机理与防控技术重点实验室, 江苏 南京 210029,南京水利科学研究院, 江苏 南京 210024;水利部土石坝破坏机理与防控技术重点实验室, 江苏 南京 210029
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)
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。

关 键 词:堆石料  UH模型  应力路径  循环加载
收稿时间:2016/4/14 0:00:00

A modified UH model for rockfill materials
WEI Kuangmin,CHEN Shengshui,LI Guoying and FU Zhongzhi.A modified UH model for rockfill materials[J].Journal of Hydraulic Engineering,2016,47(11):1418-1426.
Authors:WEI Kuangmin  CHEN Shengshui  LI Guoying and FU Zhongzhi
Affiliation:Nanjing Hydraulic Research Institute, Nanjing 210024, China;Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China,Nanjing Hydraulic Research Institute, Nanjing 210024, China;Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China,Nanjing Hydraulic Research Institute, Nanjing 210024, China;Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China and Nanjing Hydraulic Research Institute, Nanjing 210024, China;Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China
Abstract: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.
Keywords:rock-fill materials  UH model  stress path  cyclic loading
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