摘要
分析深松土壤的扰动行为是深入研究深松铲-土壤互作用规律的基础。采用离散元方法建立深松工作模型,结合高速摄影技术及室内土槽试验,对比分析了不同位置深松土壤的微观运动及宏观扰动行为。结果表明,土壤的扰动范围随土壤与深松铲之间距离的增大而减小;不同位置土壤的扰动范围由大到小依次为:浅层、中层、深层;在深松范围内,土壤的运动速度随土壤与深松铲之间距离的增大而逐渐减小,等速度土壤颗粒的分布曲线与深松铲的铲柄弧线基本吻合;不同深度土层土壤颗粒在不同方向上的平均运动速度为:在x方向上由大到小依次为浅层、中层、深层,在y方向上由大到小依次为中层、浅层、深层,在z方向上由大到小依次为深层、中层、浅层;离散元仿真能够较准确模拟深松土壤的扰动行为,仿真与试验获取的土壤扰动截面轮廓形状基本吻合,土壤膨松度、土壤扰动系数的仿真值与试验值的相对误差分别为13.21%、17.38%;地表土壤纵向堆积角的仿真值与试验值的相对误差为9.42%。
The study on disturbance behavior of subsoiling is the basis to understand the subsoiler-soil interaction law deeply. A working model of subsoiling was established by using discrete element method.In addition,with the aid of high-speed photography technique and the indoor soil-bin test,the micro movement and the macro disturbance behavior of the soil at different positions were compared and analyzed. The results showed that,the disturbance range of soil was decreased with the increasing distance between the soil and the subsoiler,and at different locations,the disturbance range from large to small was the shallow layer,the middle layer and the deep layer. In the subsoiling range,the movement speed of the soil was decreased with the increase of the distance between the soil and the subsoiler. The distribution curves of the same-speed soil particles were basically consistent with the curves of the subsoiler. The average velocities of soil particles in different depths and different directions were measured from large to small as follows： the shallow layer,the middle layer,the deep layer in x direction; the middle layer,the shallow layer,the deep layer in y direction; and the deep layer,the middle layer,the shallow layer in z direction. The discrete element simulation could accurately simulate the disturbance behavior of subsoiling,and the shape of soil disturbance section of simulation and obtained from experiment were basically matched. The relative error of the soil bulkiness and soil disturbance coefficient between simulation and experiment were 13. 21% and 17. 38%,respectively. Therelative error between the simulated longitudinal accumulation angle of the surface soil and that of experiment was 9. 42%.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第7期80-88,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
陕西省科技攻关项目(2013K02-11)
杨凌示范区科技计划项目(2014NY-29)
2015年西北农林科技大学重点项目(Z101021501)
关键词
深松
土壤扰动
离散元
高速摄影
试验
subsoiling
soil disturbance
discrete element
high-speed photography
experiment
