深松深度对土壤扰动影响的仿真与试验研究

Distinct Element Method Simulation and Experimental Research of Subsoiling Depth on Soil Disturbance

深松深度是深松作业的重要评价指标之一,可对土壤扰动产生重要影响。为此,以凿型深松铲为研究对象,综合使用离散元仿真和土槽试验方法,利用土壤坑形轮廓宽度、土壤垄形轮廓高度、土壤蓬松度、土壤扰动系数和地表平整度等评价指标,研究不同深松深度对土壤扰动的影响。结果表明:1土壤扰动轮廓截面曲线基本吻合,土壤坑形轮廓宽度和土壤垄形轮廓高度随深松深度的增加而增大;2土壤蓬松度随深松深度的增加逐渐减小,土壤扰动系数随深松深度的增加逐渐增大,且试验和仿真得到的结果一致;3地表平整度随着深松深度的增加而逐渐增大,且试验与仿真结果的趋势一致。本研究可以为深入理解深松土壤扰动过程提供决策依据。

Subsoiling depth is a key evaluation indicator of subsoiling operation, which produces an important impact on soil disturbance. In this paper, with chisel subsoiler as a research object, distinct element method simulation and soil bin experiment method was used to study the influence of subsoiling depth on soil disturbance from width of soil pit profile, height of soil ridge profile, soil volume expansivity soil disturbance coefficient and soil surface roughness. The results showed that ： （1）Soil disturbance profile curve of experiment was consistent with the soil disturbance profile curve of simu- lation, width of soil pit profile and height of soil ridge profile increased gradually with the increasing subsoiling depth ; （2） When subsoiling depth was increasing, soil volume expansivity decreased, but soil disturbance coefficient showed a increasing trend, and the simulation results agreed well with the experimental results; （3）Due to increasing subsoiling depth, soil surface roughness was on the increase, and experiment results and simulation results presented on trends in consistent. This study can provide decision basis for further understanding of soil disturbance process under subsoiling.