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介绍了2种堆石料大型三轴试验和平面应变试验的试验成果。假设土的应变分为弹性应变和剪胀应变,弹性应变与应力间服从广义虎克定律,剪胀应变服从Rowe剪胀方程,弹性泊松比为常数,完整地建立3参量Kp,Kq,G与应力关系式,初步提出了一种新的非线性剪胀模型,给出了模型参数的整理方法,论证了一般非线性弹性模型中泊松比的力学意义。试验表明,剪胀性模型能够很好地模拟堆石料的应力应变曲线,对于同一种堆石料,由三轴试验和平面应变试验得到的模型参数除强度指标外,其它参数有很好的一致性,并给出了2种堆石料的模型参数。该模型是一种力学概念明确,简单实用的非线性剪胀模型。
The results of two kinds of large-scale triaxial tests and plane strain tests of rockfill materials are introduced. Assuming that the strain of soil is divided into elastic strain and dilatancy strain, the elastic strain and stress follow the generalized Hooke’s law. The dilatancy strain follows Rowe’s dilatancy equation and the elastic Poisson’s ratio is a constant. Three parameters Kp, Kq, G And stress relations, a new model of nonlinear dilatancy is proposed. The method of organizing the model parameters is given. The mechanics significance of Poisson ’s ratio in the general nonlinear elastic model is demonstrated. The tests show that the dilatancy model can well simulate the stress-strain curve of rockfill materials. For the same kind of rockfill materials, the parameters of the model obtained by the triaxial test and the plane strain test are in good agreement with the strength index except the strength index , And gives the model parameters of two kinds of rockfill materials. The model is a non-linear dilatancy model with clear and simple mechanics.