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为了描述岩土颗粒介质在应力波作用下的接触力与变形关系,运用接触力学和刚体动力学等理论方法,考虑颗粒体之间的局部非线性相互作用,通过引入恢复系数,导出了适用于低速冲击情况下的颗粒介质弹塑性接触模型,通过几种算例的比较分析,说明了该计算方法的合理性。结果表明:本文给出的接触力与变形关系,避开了复杂的增量形式和非线性动态接触问题,且反映了颗粒体的冲击速度、物理力学性质、几何特征以及表面物理条件等因素对接触过程的影响,便于工程推广应用。
In order to describe the relationship between the contact force and the deformation under the action of stress wave in the geotechnical granular media, by using the contact mechanics and the rigid-body dynamics theory, considering the local nonlinear interactions between the granular bodies, by introducing the recovery coefficient, Under the condition of low velocity impact, the elastic-plastic contact model of granular media is given. The comparative analysis of several examples shows the rationality of this method. The results show that the relationship between contact force and deformation presented in this paper avoids the complicated incremental form and nonlinear dynamic contact problem, and reflects the influence of particle velocity, physical and mechanical properties, geometric characteristics and surface physical conditions The impact of the contact process, easy to promote the application of the project.