中文摘要：

为明确玉米根茬根土分离过程中的土壤运动与破裂规律以及根茬变形与受力规律,基于光滑粒子流体动力学（SPH）算法构建玉米根茬根土复合体仿真模型,利用该模型分别进行了玉米根茬根土复合体在压力与冲击作用下的根土分离过程动态仿真。仿真结果表明：在压缩作用下,为使土壤破碎同时避免压实,应控制压缩率〈90%;当压缩率为90%时,玉米根茬大部分根须所受等效应力为0.421~2.907 MPa;采用飞锤冲击玉米根茬根土复合体,不仅可以有效促使土壤破碎,提高根土分离效果,而且可以减少根须所受应力,降低根茬损失率。

英文摘要：

With the aims of obtaining the movement and rupture law of soil as well as the deformation and stress variation law of stubble in the roots-soil separation process of corn stubble,the numerical simulation model of corn stubble roots-soil composite was established,which was based on the SPH method.Furthermore,the above model was applied in the dynamic simulation of roots-soil separation process of the corn stubble roots-soil composite under the impact and compression. The simulation results showed that in the compression process,for the purpose of crushing soil and preventing soil compaction,the compression rate should be lower than 90%; when the compression rate was 90%,the equivalent stress of the most roots was from 0. 421 MPa to 2. 907 MPa; impacting corn stubble roots-soil composite with hammer not only improved the effect of roots-soli separation,but also decreased the stress of the roots and reduced the roots loss rate.