3-D DEM simulation of cohesive soil-pushing behavior by bulldozer blade
3-D DEM simulation of cohesive soil-pushing behavior by bulldozer blade
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DOI：
10.1016/j.jterra.2011.11.003
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发表时间：
2012-02-01
影响因子：
2.4
通讯作者：
Tanaka, T.
中科院分区：
文献类型：
--
作者：
Tsuji, T.;Nakagawa, Y.;Tanaka, T.
采用离散单元法对推土机铲土过程进行了数值模拟。土壤中含有水分，土粒间形成的液桥所产生的粘聚力对作用在推土机铲刀上的阻力有很大影响。在本研究中，引入了Utili和Nova [5]提出的粘聚力模型，其中粘聚力的微观行为与宏观剪切破坏特征相似。验证了微观内聚力大小的依赖性。考虑内聚键合力后，颗粒的行为发生了很大变化。挖掘土壤团聚体的特征行为，如滚动运动和间歇性崩溃，在刀片表面的前面观察。(C)2011年ISTVS。由爱思唯尔有限公司出版。保留所有权利。
A numerical simulation based on discrete element method (DEM) was conducted on the excavation and pushing processes of soil by a bulldozer blade. Soil contains water and the resistance acting on the bulldozer blade is largely influenced by the cohesive force due to liquid bridges formed among soil particles. In the present study, a cohesive bond force model proposed by Utili and Nova [5] was introduced in which the microscopic behavior of cohesive force was modeled analogously with macroscopic shear failure characteristics. The dependency on the magnitude of microscopic cohesive force was verified. The behavior of particles changed greatly by taking into account the cohesive bond force. The characteristic behavior of excavated soil aggregates, such as rolling motion and intermittent collapsing, were observed in front of the blade surface. (C) 2011 ISTVS. Published by Elsevier Ltd. All rights reserved.