【摘要】 前后铲距是分层深松铲的关键参数之一,会对土壤扰动行为产生重要影响。为此,综合运用离散元仿真和数字化土槽试验,研究了前后铲距对土壤宏、微观扰动行为的影响。结果表明:当前后铲距为350mm时,耕作比阻及不同层土壤颗粒在耕作方向上的最大位移相对较小,犁底层土壤颗粒在竖直方向上的最大位移和侧向方向上的最大位移相对较大,耕作层土壤颗粒在竖直方向上的最大位移相对较小;5个不同前后铲距下土壤膨松度、土壤扰动系数、耕作阻力和耕作比阻的试验和仿真结果的平均误差分别为12.41%、13.61%、13.84%、3.34%,离散元仿真能够较为准确地模拟分层深松土壤的扰动过程。更多还原

【Abstract】 As one of the key structural parameters of the layered subsoiler, the longitudinal tine spacing has an important impact on soil disturbance behaviors. In this paper, the effects of longitudinal tine spacing on soil disturbance behaviors were investigated using the discrete element method(DEM) and digitalized soil-bin tests. The results showed that with the increase of the longitudinal tine spacing, the soil bulkiness and disturbance coefficient were initially increased and then decreased. The longitudinal tine spacing of 350 mm gave relatively small specific draft force(SDF) and the maximum displacement in the travel direction of soil particles at different depths and the maximum displacement in the vertical direction of top layer soil particles, and relatively large maximum displacement in the vertical and lateral direction of hardpan soil particles. The experimental and simulated soil bulkiness, soil disturbance coefficient, draft force and SDF under 5 different longitudinal tine spacings were 12.41%, 13.61%, 13.84%, 3.34%, respectively. This indicated a good agreement between the discrete element simulations and the experiments.更多还原