论文部分内容阅读
基于广义位势理论,把土与结构的接触面问题看作(σn,τ)空间上的二维问题,用两个线性无关的势函数梯度矢量表示两个塑性应变增量的分量dεnp,dγp组成的矢量,并用塑性状态方程取代传统的屈服面,建立了双重势面接触面弹塑性新模型。结合含砾粗砂与钢板接触面单剪试验以及单向压缩试验资料,说明模型参数的确定方法,其中采用抛物线和一阶指数衰减曲线拟合接触面先剪缩后剪胀的试验曲线,曲线参数有物理意义且拟合精度高,参数完全可以通过试验确定。结果表明,模型数学原理清晰,物理假设少,且具有一般性,能够反映接触面的剪胀特性以及准确模拟接触面的变形特性。
Based on the generalized potential theory, the problem of the interface between soil and structure is considered as a two-dimensional problem in space (σn, τ). Two linearly independent potential gradient vectors are used to represent the components dεnp and dγp The new model of the elastic-plastic double contact surface is established by replacing the traditional yield surface with the plastic state equation. Based on the single-shear test and the uniaxial compression test data of contact surface between gravel grit and steel plate, the method to determine the model parameters is described. The parabola and the first-order exponential decay curve are used to fit the experimental curve of dilatancy at the contact surface after shearing and shrinking. The parameters have physical meaning and the fitting precision is high, the parameters can be determined through experiments. The results show that the mathematical principle of the model is clear, the physical hypotheses are few and the generality can reflect the dilatancy of the contact surface and accurately simulate the deformation characteristics of the contact surface.