深松铲对砖红壤扰动行为影响的仿真与试验

Simulation and Experiment on the Influence of Subsoiler on Iateritic Soil Disturbance Behavior

针对香蕉地深松作业相关研究较少,深松铲-土壤耦合机理尚未明确等问题,结合海南热区香蕉地砖红壤土的物理特性,利用离散元虚拟仿真试验,堆积生成了耕作层、犁底层和心土层3层土壤模型,建立了滑切深松铲-土壤耕作模型,并通过对比虚拟仿真试验,研究了滑式深松铲和国标深松铲对海南香蕉地土壤的扰动情况。结果表明:在相同的作业条件下,滑式深松铲作用下的土壤颗粒在x、y和z方向的最大运动速度均明显大于国标深松铲对土壤颗粒的作用,且滑式深松铲的扰动轮廓要明显大于国标深松铲作业的扰动轮廓,同时滑式深松铲作用下土壤蓬松度和土壤扰动系数均大于国标深松铲作用产生的深松效果,进一步验证了所设计的滑式深松铲更适用于海南香蕉地的深松作业。

In view of the problems that there are few relevant studies on subsoiling operation in Hainan banana field and the coupling mechanism between subsoiling shovel and soil is unclear,this paper combines the physical characteristics of banana field soil in Hainan tropical zone,accumulates and generates three-layer soil models of tillage layer,plow bottom layer as well as core soil layer by using discrete element simulation and virtual soil tank test comprehensively.In addition,the sliding subsoiling shovel soil model tillage model under the same conditions is established.The influence of subsoiling shovel on Soil Micro disturbance behavior has been studied by comparing with the national standard subsoiling shovel.The results indicate that under the same operating conditions,the maximum movement speed of soil particles in x,y and z directions under the action lof sliding subsoiling shovel is significantly greater than that of national standard subsoiling shovel,which also applys to the comparison between disturbance profile of sliding subsoiling shovel and that of national standard subsoiling shovel.Meanwhile,the soil fluffy degree and soil disturbance coefficient under the action of sliding subsoiling shovel is likewise greater than that of national standard subsoiling shovel.The findings further verify that the designed sliding subsoiling shovel is more suitable for subsoiling in banana field in Hainan.