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建立了一种土壤非线性力学模型,可以反映土壤弹塑性变形和振动轮跳振等不同压实阶段特点。数值仿真表明,土壤弹塑性变形阶段,系统做周期运动,振动轮起跳后产生次谐波分量,减小阻尼会使谐波分量增加,在一定条件下出现分岔并引发混沌。对研究压实作业中如何产生混沌运动和避免振动轮跳振提供了理论依据。
A nonlinear soil mechanics model was established to reflect the characteristics of different compaction stages such as elastoplastic deformation of soil and vibration of vibratory wheel. Numerical simulations show that the system performs periodic motions during the elastic-plastic deformation stage of the soil, and generates subharmonic components after the vibration wheels take off. With damping, the harmonic components increase, and under certain conditions, bifurcation and chaos occur. It provides a theoretical basis for studying how to generate chaos in compaction and to avoid the vibration of vibration wheel.