PREVENTION OF SOIL COMPACTION ON HARD-PAN DUE TO CYCLIC WHEEL LOADS

防止由于循环轮载荷而导致硬盘上的土壤压实

基本信息

批准号：
10460112
负责人：
HASHIGUCHI Koichi
金额：
$ 5.76万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10460112/
关键词：
Wheel performance testing device Online-measurement of soil deformation Cyclic compaction of soil Tractive efficiency Extended subloading surface model Soil stress measurement system Elastoplastic finite element analysis 有限要素解析圃場耕盤土

项目摘要

The evil influence on soils for crop growing has been brought out by the cyclic compaction by farm wheels, whilst the sizes of farm machinery are increasing year and year. In this research the soil compaction phenomenon due to the wheel traveling is studied experimentally using the soil bin equipment for the precise measurement of wheel traveling performance and theoretically developing the elastoplastic finite element program. The main results obtained in this article are as follows :1) Soil particles traces an ellipsoidal locus by the passage of wheel. The locus locates backward relative to wheel as the slippage increases.2) The size of locus decreases with the number of wheel traveling. Its rate of decrease is more remarkable as the slippage increases.3) The compaction of soil is remarkable near the soil surface. It decreases proportionally to the depth until 60 mm depth and then decreases rapidly. Bedsides, it decreases exponentially with the number of wheel traveling.4) The amplitude of shear strain increases and thus soil compaction becomes remarkable with the slippage. In other words, the soil compaction is influenced remarkably by the dilatancy due to the shear deformation.5) The highest tractive efficiency and the smallest soil compaction is realized at the 5-10% slippage in the case of the rigid wheel traveling on sandy soil.6) The finite element program was developed incorporating the subloading surface model. The soil deformation beneath the wheel is predicted qualitatively by the program.

农场轮的循环压实带来了对农作物生长的土壤的邪恶影响，而农用机械的尺寸越来越多。在这项研究中，使用土壤箱设备对车轮行进的土壤压实现象进行了研究，以精确测量车轮行进性能，并从理论上开发弹性塑料有限元元素程序。本文中获得的主要结果如下：1）土壤颗粒通过车轮的通过跟踪椭圆形的基因座。随着滑移的增加，基因座相对于车轮的向后定位。2）基因座的大小随着车轮行进的数量而减小。随着滑倒的增加，其降低速度更加明显。3）土壤的压实在土壤表面附近显着。它与深度成比例降低，直到深度为60 mm，然后迅速降低。床边，随着车轮行进的数量，它呈指数减小。4）剪切应变的幅度增加，因此土壤压实随着滑移而变得显着。换句话说，土壤压实受剪切变形引起的膨胀的影响。5）5）最高的拖动效率，最小的土壤压实在5-10％的滑移处实现，而在沙质土壤上行驶的刚性轮则是5-10％。该程序定性地预测了方向盘下方的土壤变形。