粗粒土体变规律大型三轴试验研究Large-scale triaxial test study on volumetric strain law of coarse-grained soil
孟飞,张家生,胡奇凡,陈晓斌,王启云
摘要(Abstract)：
采用粗粒土大型三轴剪切仪,对饱和粗粒土进行固结排水剪切试验,提出了拟合三轴剪切试验中轴向应变与侧向应变的函数方程,利用此关系式对三轴试验中试样的体积应变进行了预测。预测结果表明:改进模型能合理地描述粗粒土的体积应变规律,尤其是高围压下剪缩、低围压下剪胀的特性。由体积应变方程导出以轴向应变为自变量的切线泊松比表达式,通过与邓肯张模型及由数值方法求得的切线泊松比对比,讨论了该表达式的合理性。
关键词(KeyWords)： 粗粒土;大型三轴试验;剪胀;体积应变
基金项目(Foundation): 国家自然科学基金资助项目(NO.50908233);; 国家工程实验室基金资助项目(2008G031-Q)
作者(Author): 孟飞,张家生,胡奇凡,陈晓斌,王启云
DOI: 10.13928/j.cnki.wrahe.2013.06.034
参考文献(References)：
- [1]DUNCAN J M,CHANG C Y.Nonlinear Analysis of stress and strainin soils[J].Journal of the Geotechnical Engineering Division,Amer-ican Society of Civil Engineering,1970,96(5):1629-1653.
- [2]LADE P V,DUNCAN J M.Elastoplastic stress-strain theory for co-hesionless soil[J].Journal of the Geotechnical Engineering Divi-sion,American Society of Civil Engineering,1975,101(10):1037-1053.
- [3]WANG R G,GUO R G.A simple constitutive model for granularsoils:modified stress-dilatancy approach[J].Computers andGeotechnics,1998,22(2):109-113.
- [4]WANG R G,GUO R G.A pressure and density dependent dilatan-cy model for granular materials[J].Soils and Foundations,1999,39(6):1-12.
- [5]郭庆国.粗粒土的工程特性及应用[M].郑州:黄河水利出版社,1999.
- [6]张嘎,张建民.粗颗粒土的应力应变特性及其数学描述研究[J].岩土力学,2004,25(10):1587-1591.
- [7]程展林,姜景山,丁红顺,等.粗粒土非线性剪胀模型研究[J].岩土工程学报,2010,32(3):460-467.
- [8]程展林,丁红顺,吴良平.粗粒土试验研究[J].岩土工程学报,2007,29(8):1151-1158.
- [9]程展林,陈鸥,左永振,等.再论粗粒土剪胀性模型[J].长江科学院院报,2011,28(6):39-49.
- [10]ROWE P W.The relation between the shear strength of sands in tri-axial compression,plane strain and direct shear[J].Geotechnique,1969,19(1):75-86.
- [11]徐明,宋二祥.粗粒土的一种应变硬化模型[J].岩土力学,2010,31(9):2967-2972.
- [12]Mcdowell G R,Nakata Y,Hyodo M.On the plastic hardening ofsand[J].Geotechnique,2002,52(5):349-358.
- [13]Salim W,Indraratna B.A new elastoplastic constitutive model forcoarse granular aggregates incorporating particle breakage[J].Cana-dian Geotechnical Journal,2004,41(4):657-671.
- [14]刘萌成,高玉峰,刘汉龙.堆石料剪胀特性大型三轴试验研究[J].岩土工程学报,2008,30(2):205-211.
- [15]陈晓斌.红砂岩粗粒土剪胀效应大型三轴试验研究[J].岩石力学与工程学报,2010,29(增1):3145-3149.
- [16]李广信.高等土力学[M].北京:清华大学出版社,2004.