基于LS-DYNA轻便触探与砂体作用的显示动力学机理

在显示积分有限元分析软件Ls-Dyna平台上进行了轻便触探与砂土相互作用的显示动力学模拟计算,为了减少计算时间,采取了提高准静态加载速度的方法。通过对轻便触探探头与砂土之间的相互作用的显示动力学模拟计算分析,给出了探头周围砂体的有效应力变化规律,从动态理论分析角度揭示了轻型动力触探在回填中粗砂中的作用机理。研究表明：轻型动力触探可以用于桥、涵台背回填中粗砂密实度检测。

Mechanism Research on Display Kinetics by Light Dynamic Penetration and Coarse Sand on Ls-Dyna

In order to reduce the computational time, the display kinetics analog computation of the interaction ot light penetration and sandy soil was carried out by the means of improving the quasi-static loading speed on the platform of display integration finite element analysis software Ls-Dyna. Through analyzing the display kinetics analog computation of the interaction of light penetration probe and sand, the variation of effective stress of the sand around the probes have been obtained, which have revealed the light dynamic penetration mechanism in the back- filled coarse sand by dynamic analysis theory. The results show that： the light dynamic penetration can be used for density detection of backfilled coarse sand at bridge and culvert abutment.