本文選題：廣義塑性模型　切入點(diǎn)：應(yīng)力路徑　出處：《水利水運(yùn)工程學(xué)報(bào)》2017年04期

【摘要】：針對(duì)同一系列某花崗巖堆石料不同應(yīng)力路徑加載試驗(yàn),進(jìn)行了修正廣義塑性模型與修正南水模型的應(yīng)力路徑適應(yīng)性對(duì)比研究。研究結(jié)果表明:兩類(lèi)模型均可以很好地預(yù)測(cè)常規(guī)三軸加載試驗(yàn)結(jié)果;對(duì)于等p加載應(yīng)力路徑試驗(yàn),二者可以很好地預(yù)測(cè)強(qiáng)度特征,但是預(yù)測(cè)的體變偏差較大,兩類(lèi)模型均低估了等p試驗(yàn)下堆石料的體縮特性;對(duì)于等應(yīng)力比加載試驗(yàn),南水模型預(yù)測(cè)結(jié)果優(yōu)于廣義塑性模型,對(duì)剪脹(縮)規(guī)律預(yù)測(cè)較好。廣義塑性模型預(yù)測(cè)結(jié)果與試驗(yàn)值相差較大,主要原因在于常規(guī)三軸試驗(yàn)下的剪脹方程并不適用于等應(yīng)力比試驗(yàn),采用本文建議的修正剪脹方程后,廣義塑性模型對(duì)等應(yīng)力比路徑試驗(yàn)預(yù)測(cè)精度明顯提高。
[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.
【作者單位】： 同濟(jì)大學(xué)地下建筑與工程系;南京水利科學(xué)研究院;
【基金】：國(guó)家自然科學(xué)基金青年基金資助項(xiàng)目(51509163) 水利部公益性行業(yè)科研專(zhuān)項(xiàng)經(jīng)費(fèi)項(xiàng)目(201501035)
【分類(lèi)號(hào)】：TV41

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