一个联系现场和室内的本构模式

在总结国内外有关研究成果的基础上,对联合室内和现场试验研究土体本构模型及确定模型参数方法进行了初步探索.通过室内固结排水静力三轴剪切试验研究发现,在不同固结应力及干密度下,割线模量Es与轴向应变εa的关系曲线可以采用最大弹性模量Emax及参考应变εr归一为Es/Emax~εa/εr曲线,归一的曲线受结构性、颗粒大小及级配等因素的影响很小,提出以土层原位试验得到的Emax代替室内试验的Emax,获到原位土体实际的Es~εa曲线.针对邓肯双曲线模式的缺点,提出了一种新的土体静力应力应变关系本构模式,新模式能很好地描述试验结果.

A New Soil Constitutive Model Based on Tests Both in Field and in Laboratory

Preliminary study on soil constitutive model and determination of its parameters through both tests in laboratory and in field is made based on summarizing related research achievements. Through laboratory consolidation drainage static triaxial compression test, it is found out that the relationship curve of Es--εa can be normalized to Es/Emax--εa/εr by maximum elastic modulus and reference shear strain respectively. The structure, particle size and gradation have little effect on the normalized curve. Therefore, to achieve the in-situ Es--εa. curve, the maximum elastic modulus Emax determined in field should be adopted in plotting Es--εa curve, instead of E determined in laboratory; and a new static constitutive model which is better in describing experimental results, is developed.