基于PLAXIS的苜蓿地土壤压实有限元模拟

doi:10.11733/j.issn.1007-0435.2014.01.013

›› 2014, Vol. 22 ›› Issue (1): 78-84.DOI: 10.11733/j.issn.1007-0435.2014.01.013

基于PLAXIS的苜蓿地土壤压实有限元模拟

高爱民, 戴飞, 吴劲锋, 张锋伟, 韩正晟

甘肃农业大学, 甘肃兰州 730070

收稿日期:2013-06-04 修回日期:2013-10-03 出版日期:2014-02-15 发布日期:2014-01-28
通讯作者: 韩正晟，E-mail：hanzhengsheng@gsau.edu.cn
作者简介:高爱民（1981-），男，甘肃庆阳人，博士研究生，研究方向为机械化耕作理论与技术，E-mail：gaoaimin@gsau.edu.cn
基金资助:
国家自然科学基金（51365003）资助

Finite Element Simulation of Alfalfa Soil Compaction by PLAXIS

GAO Ai-min, DAI Fei, WU Jing-feng, ZHANG Feng-wei, HAN Zheng-sheng

Gansu Agricultural University, Lanzhou, Gansu Province 730070, China

Received:2013-06-04 Revised:2013-10-03 Online:2014-02-15 Published:2014-01-28

摘要/Abstract

摘要： 为研究压实后土壤内部应力及位移的变化规律，在割草机对苜蓿（Medicago sativa）地土壤压实试验的基础上，基于PLAXIS软件对苜蓿地土壤压实进行了有限元模拟。结果表明：车辙中线下方土壤应力较轮胎边缘下方大，土壤应力较大部位出现在0～20 cm范围内，各部位应力分布不平衡，随碾压次数的增多，应力增加范围由地表向下延伸，由轮辙中线向轮辙边缘逐步扩大；沿水平方向的地表应力变化区域与轮胎接地面积相当，沿竖直方向向下，其变化范围逐步扩大，大应力区域为一以轮胎接地面积为底的锥形区域，轮辙下部的土壤形成一个较硬的应力核，其最大应力处于该核的中心，并由此向外应力逐步减小；应力核的中心部位，应力达到最大值后，随碾压次数的增加，土壤团聚结构会被破坏，土壤出现屈服；随着碾压次数的增多，0～30 cm深度上的土层均逐步沉降，沉降主要是第1次碾压所致，之后逐步减弱，直至土壤失效；通过软件对土壤压缩量的预测值与实测值对比分析发现，该软件对表层轮辄深度的预测误差较小，应用PLAXIS软件对土壤压实进行预测具有一定的实用意义。

关键词: 土壤压实, 有限元模拟, 土壤应力

Abstract: Alfalfa soil compaction by mowing machine was simulated using software PlAXIS on the basis of experiments to investigate compacted soil internal stress and displacement variation. Results showed that the stress under the middle of wheel tack was higher than the edge of wheel tack and soil stress range in size from 0 to 20 cm was higher than others. The effect range of soil stress caused by compaction was extended with the increase of rolling compaction. The change area of soil surface stress along the horizontal direction matched tire contact area and the area of stress gradually expanded along the vertical direction. Soil aggregates were damaged when the stress reached a maximum value with the increase of rolling compaction. Soil settlement gradually occurred from 0 to 30 cm depth with the increase of rolling compaction. The first compaction played an important role in soil settlement and then reduced gradually until soil yield. Comparative analyses between the forecasted value and measured value indicated that there was very little forecast error in predicted value. Therefore, software PLAXIS has a certain practical significance to forecast soil compaction.

Key words: Soil compaction, Finite element simulation, Soil stress

中图分类号:

高爱民, 戴飞, 吴劲锋, 张锋伟, 韩正晟. 基于PLAXIS的苜蓿地土壤压实有限元模拟[J]. , 2014, 22(1): 78-84.

GAO Ai-min, DAI Fei, WU Jing-feng, ZHANG Feng-wei, HAN Zheng-sheng. Finite Element Simulation of Alfalfa Soil Compaction by PLAXIS[J]. , 2014, 22(1): 78-84.

参考文献

[1] Aragón A. Maximun compactibility of Argentine soils from the proctor test: The relationship with organic carbon and water content[J]. Soil and Tillage Research, 2000, 56(3/4):197-204
[2] 高爱民, 韩正晟, 吴劲锋.割草机对苜蓿地土壤压实的试验研究[J].农业工程学报, 2007, 2(9):101-105
[3] 曾德超.机械土壤动力[M].北京:科学技术出版社, 1995:1-882
[4] 李汝莘, 宋洪波, 高焕文.小型拖拉机土壤压实的有限元预测[J].农业工程学报, 2001, 17(4):66-69
[5] 郭维俊, 黄高宝, 王芬娥, 等.农业土壤应力状态与作物根系生长相关性研究[J].兰州大学学报, 2006, 42(2):120-123
[6] Kaiming Xia. Finite element modeling of tire/terrain interaction: Application to predicting soil compaction and tire mobility[J]. Journal of Terramechanics, 2011, 48(2):113-123
[7] Keller T. Challenges in the development of analytical soil compaction models[J]. Soil and Tillage Research, 2010, 111(1):54-64
[8] Kaiming Xia. A large deformation finite element model for soil compaction[J]. Geomechanics and Geoengineering: An International Journal, 2012, 7(2):123-137
[9] 崔凯, 王磊.模拟土壤表面竖向应力分布的新方法[J].山东农业大学学报, 2009, 40(4):541-544
[10] 郭维俊, 黄高宝, 王芬娥, 等.土壤-植物根系复合体本构关系的理论研究[J].中国农业大学学报, 2006, 11(2):35-38
[11] Poodt M P, Koolen A J, van der Linden J P. FEM analysis of subsoil reaction on heavy wheel loads with emphasis on soil preconsolidation stress and cohesion[J]. Soil and Tillage Research, 2003, 73(1/2):67-76
[12] Thomas K. A Model for the prediction of the contact area and the distribution of vertical stress below agricultural tyres from readily available tyre parameters[J]. Biosystems Engineering, 2005, 92(1):85-96
[13] PLAXIS.Finite element code for soil and rock analysis(905410449X.)(version 7)[M]. Rotterdam Netherlands:Balkema, 1998
[14] Van den Akker J J H, Canarache A. Two European concerted actions on subsoil compaction[J].Landnutzung und Landentwicklung, 2001, 42:15-22
[15] Imhoff S, Da Silva A P, Fallow D. Susceptibility to compaction, load support capacity, and soil compressibility of Hapludox[J]. Soil Science Society of America Journal, 2004, 68(1):17-24
[16] Poode M P, Koolen A J. Calculation of soil stress under sugarbeet harvester tyres with a finite element model and a cam clay type soil model[C]//Proceedings of the Fourth international Conference on Soil Dynmics. Adelaide, South Austral: 2000:26-30
[17] 李小刚, 杨治, 谢恩波.甘肃几种旱地土壤低吸力段持水性能的初步研究[J].土壤通报, 1994, 25(4):155-157
[18] 梁燕, 谢永利, 刘保健, 等.非饱和黄土渗透性的试验研究[J].水文地质工程地质, 2006(2):27-30
[19] Servadio P, Marsili.A, Vignozzi.N, et al. Effects on some soil qualities in central Italy following the passage of four wheel drive tractor fitted with single and dual tires[J]. Soil and Tillage Research, 2005, 84(1):87-100
[20] 徐中华, 王建华.有限元分析土壤切削问题的研究进展[J].农业机械学报, 2005, 36(1):134-137
[21] 付晓莉, 邵明安.一种改进的土壤压实模型及试验研究[J].农业工程学报, 2007, 23(4):14-19

基于PLAXIS的苜蓿地土壤压实有限元模拟

Finite Element Simulation of Alfalfa Soil Compaction by PLAXIS

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