堆石料广义塑性模型对不同应力路径适应性研究

发布时间：2018-03-29 22:25

本文选题：广义塑性模型　切入点：应力路径　出处：《水利水运工程学报》2017年04期

【摘要】：针对同一系列某花岗岩堆石料不同应力路径加载试验,进行了修正广义塑性模型与修正南水模型的应力路径适应性对比研究。研究结果表明:两类模型均可以很好地预测常规三轴加载试验结果;对于等p加载应力路径试验,二者可以很好地预测强度特征,但是预测的体变偏差较大,两类模型均低估了等p试验下堆石料的体缩特性;对于等应力比加载试验,南水模型预测结果优于广义塑性模型,对剪胀(缩)规律预测较好。广义塑性模型预测结果与试验值相差较大,主要原因在于常规三轴试验下的剪胀方程并不适用于等应力比试验,采用本文建议的修正剪胀方程后,广义塑性模型对等应力比路径试验预测精度明显提高。
[Abstract]:According to the loading test of different stress paths for the same series of granite heaps, A comparative study on the adaptability of the modified generalized plastic model and the modified Nanshui model is carried out. The results show that both kinds of models can well predict the results of the conventional triaxial loading test, and for the stress path test under equal p loading, The two models can predict the strength characteristics well, but the bulk variation deviation of the two models is large, both of the two models underestimate the bulk shrinkage characteristics of the rockfill under the equal p test, and for the iso-stress ratio loading test, the prediction result of the Nanshui model is better than that of the generalized plastic model. The prediction results of the generalized plastic model differ greatly from the experimental values. The main reason is that the shear expansion equation under the conventional triaxial test is not suitable for the equal stress ratio test, and the modified shear expansion equation is proposed in this paper. The prediction accuracy of the generalized plastic model with equal stress ratio path test is obviously improved.
【作者单位】：同济大学地下建筑与工程系;南京水利科学研究院;
【基金】：国家自然科学基金青年基金资助项目(51509163) 水利部公益性行业科研专项经费项目(201501035)
【分类号】：TV41

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