基于无侧限抗压强度试验的土壤离散元参数标定

被引：59

作者：

谢方平 ^{[1
,2
]}

吴正阳 ^{[1
]}

王修善 ^{[1
,2
]}

刘大为 ^{[1
,2
]}

邬备 ^{[1
,2
]}

张正中 ^{[1
]}

机构：

[1] 湖南农业大学机电工程学院

[2] 智能农机装备湖南省重点实验室

来源：

农业工程学报 | 2020年 / 36卷 / 13期

关键词：

土壤; 应力; 应变; 离散元法; 标定; 塑性变形; 无侧限抗压强度;

D O I：

暂无

中图分类号：

S152 [土壤物理学];

学科分类号：

090301 [土壤学];

摘要：

为标定基于Edinburgh Elasto-Plastic Adhesion (EEPA)模型的土壤离散元参数,该研究通过单轴密闭压缩试验和无侧限抗压强度试验,以无侧限抗压强度σu为黏性指标,轴向应变εn为塑性指标,轴向压力-轴向应变曲线特征参数(a,b)为弹性指标,基于响应面标定了土壤离散元仿真参数。结合文献与实际情况确定参数试验范围,应用Plackett-Burman试验对7个初始参数进行筛选,发现塑性变行比λp和表面能Δγ对黏塑性指标影响显著。根据试验结果,进行2次Central Composite试验,建立σu、εn与黏塑性参数的二次回归模型和σu、εn、a、b与弹性参数二次回归模型,并以实测值为目标优化求解,获得的优化参数组合为:塑性变形比为0.36、表面能为15.6 J/m2、恢复系数为0.37、静摩擦系数为0.6、滚动摩擦系数为0.26、黏性分支指数为4.24、切向刚度因子为0.52。最后将该参数组合下的仿真值与实测值进行对比验证,发现仿真εn和b与实测值无显著差异,σu和a与实测值存在较大差异。结果表明基于响应面法标定的EEPA模型参数可表征试验土壤的轴向塑性变形和3%～45%轴向应变内的应力-应变行为。

引用

页码：39 / 47

页数：9

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