目的实现肝脏组织颗粒离散元模型接触参数的标定。方法基于MATLAB图像处理技术,测量肝脏组织颗粒的堆积角;采用'Hertz-Mindlin with JKR'接触模型对肝脏组织颗粒进行堆积角的仿真试验,以滚动摩擦系数和JKR表面能作为因素设计正...目的实现肝脏组织颗粒离散元模型接触参数的标定。方法基于MATLAB图像处理技术,测量肝脏组织颗粒的堆积角;采用'Hertz-Mindlin with JKR'接触模型对肝脏组织颗粒进行堆积角的仿真试验,以滚动摩擦系数和JKR表面能作为因素设计正交试验;采用批处理方法标定接触模型的参数,将结果中最优参数组合进行二次仿真标定验证。结果物理试验所得到的堆积角为11.2°±0.86°,正交试验中第6组参数组合得到的堆积角为11.8°,相对误差为5.1%,即物理试验与仿真试验在堆积角度和形状上具有较高的相似性;影响堆积角的因素顺序依次为:组织颗粒与不锈钢板之间JKR表面能>组织颗粒与不锈钢板之间滚动摩擦系数>组织颗粒与组织颗粒之间JKR表面能=组织颗粒与组织颗粒之间滚动摩擦系数。结论可利用该优化参数对生物组织开展进一步的组织颗粒与粉碎器间的离散元仿真,从而揭示组织颗粒在肌瘤粉碎器作用下的流动堆积状态。展开更多
The Xiangshan deposit in Jiangxi province is one of the most important uranium deposits in China. The aim of this study is to achieve a better understanding of mineralization in the Xiangshan deposit through numerical...The Xiangshan deposit in Jiangxi province is one of the most important uranium deposits in China. The aim of this study is to achieve a better understanding of mineralization in the Xiangshan deposit through numerical simulation. In order to find the most favorable locations of mineralization and to help further mineral exploration, a coupling deforma- tion and fluid flow model has been established to describe the mineralization process. In this model, the simulation re- constructs the strata deformations under fields of compressive stress and thrust structure on the hanging wall of the Zou-Shi fault. Compared with practical information, the simulation results are consistent with the No. 51 exploration section of the western Xiangshan. In addition, on the basis of geological information provided by previous investigators, the model simulates the flow process of fluids under compressive stress fields. The result suggests that many tensional areas are formed, which can help the fluid flowing upward from deeper parts. The fluid is easy to concentrate on the breccia fractured zone between two volcanic layers, especially on the intersection parts with faults, resulting in the for- mation of favourable locations of mineralization. In addition, the model is significant in guiding the exploration of ura- nium deposits in the western Xiangshan and provides clues for further exploration of deposits.展开更多
文摘目的实现肝脏组织颗粒离散元模型接触参数的标定。方法基于MATLAB图像处理技术,测量肝脏组织颗粒的堆积角;采用'Hertz-Mindlin with JKR'接触模型对肝脏组织颗粒进行堆积角的仿真试验,以滚动摩擦系数和JKR表面能作为因素设计正交试验;采用批处理方法标定接触模型的参数,将结果中最优参数组合进行二次仿真标定验证。结果物理试验所得到的堆积角为11.2°±0.86°,正交试验中第6组参数组合得到的堆积角为11.8°,相对误差为5.1%,即物理试验与仿真试验在堆积角度和形状上具有较高的相似性;影响堆积角的因素顺序依次为:组织颗粒与不锈钢板之间JKR表面能>组织颗粒与不锈钢板之间滚动摩擦系数>组织颗粒与组织颗粒之间JKR表面能=组织颗粒与组织颗粒之间滚动摩擦系数。结论可利用该优化参数对生物组织开展进一步的组织颗粒与粉碎器间的离散元仿真,从而揭示组织颗粒在肌瘤粉碎器作用下的流动堆积状态。
基金Projects GPMR0547 supported by the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, and 2002 CB 412601 by the Chinese Ministry of Science and Technology
文摘The Xiangshan deposit in Jiangxi province is one of the most important uranium deposits in China. The aim of this study is to achieve a better understanding of mineralization in the Xiangshan deposit through numerical simulation. In order to find the most favorable locations of mineralization and to help further mineral exploration, a coupling deforma- tion and fluid flow model has been established to describe the mineralization process. In this model, the simulation re- constructs the strata deformations under fields of compressive stress and thrust structure on the hanging wall of the Zou-Shi fault. Compared with practical information, the simulation results are consistent with the No. 51 exploration section of the western Xiangshan. In addition, on the basis of geological information provided by previous investigators, the model simulates the flow process of fluids under compressive stress fields. The result suggests that many tensional areas are formed, which can help the fluid flowing upward from deeper parts. The fluid is easy to concentrate on the breccia fractured zone between two volcanic layers, especially on the intersection parts with faults, resulting in the for- mation of favourable locations of mineralization. In addition, the model is significant in guiding the exploration of ura- nium deposits in the western Xiangshan and provides clues for further exploration of deposits.
