饱和砂土动力特性及数值方法研究

典型的实验表明,颗粒状砂土的变形与破坏特征有赖于其自身构造特性(密度或孔隙率,各项异性程度)、多组分相特性(饱和或者准饱和)、作用荷载特性(载荷作用时间长短)、应力比和体积约束条件等。本文依据实验变形和破坏特征,采用平面应变弹塑性有效应力模型建立了适宜于饱和砂土的动力分析方法,编制了分析模块程序并与通用岩土分析软件FLAC接口,比较在爆炸荷载作用下饱和砂土中波传播特性的数值模拟结果与试验结果,证实了模型及程序的正确性与有效性。

Study on dynamic behaviour and numerical method for saturated sand

The typical tests indicate that the characteristic of a granular soil depends mainly on its tectonic levels(density or void ratio, anisotropy content),mutiply phase contents (saturated or quasic saturated),the applied loading,stress ratio and volumetric constraints. The plane strain elasto plastic effective stress constitutive model is used to saturated sand according to dynamic deformation and failure effects. The analysis module are programmed and interfaced with the FLAC code. The good agreement of the experimental results and numerical results of the wave propagation in saturated sand using the FLAC code indicate that the presented model and the code are available and effective. 