| 张杰,聂如松,谭永长,李列列.柔性耦合边界下饱和土不排水三轴试验模拟方法研究[J].计算力学学报,2025,42(2):258~263,328 |
|
| 
码上扫一扫！ |
| 柔性耦合边界下饱和土不排水三轴试验模拟方法研究 |
| Discrete element modeling of undrained triaxial tests for saturated soils based on flexible coupling boundary |
| 投稿时间：2023-09-04 修订日期：2023-12-03 |
| DOI：10.7511/jslx20230904002 |
| 中文关键词: 离散元模拟 柔性耦合边界 固结不排水三轴 流体耦合算法 饱和土 |
| 英文关键词:DEM simulation flexible coupling boundary undrained triaxial tests coupling fluid method saturated soil |
| 基金项目:国家自然科学基金(51878666)资助项目. |
|
| 摘要点击次数: 12 |
| 全文下载次数: 10 |
| 中文摘要: |
| 针对目前离散元(DEM)中柔性耦合边界无法模拟不排水三轴试验的现状,将流体耦合算法(CFM)与柔性耦合边界构建方法结合起来,从而将柔性耦合边界扩展到不排水三轴试验模拟中。首先,通过CFM与DEM耦合实现了刚性边界下饱和土的固结不排水(CU)三轴试验模拟,将结果与常体积法(CVM)进行对比,验证了CFM-DEM耦合的可靠性。其次,进行了柔性耦合边界下饱和土的CU三轴试验模拟,将其与刚性边界下的模拟结果进行对比,证明了柔性耦合边界的优势。最后,采用基于柔性耦合边界的CFM-DEM模型进一步模拟了不同初始孔隙率饱和土试样的CU三轴试验,研究了不同初始孔隙率试样的不排水剪切特性,结果表明提出的模拟方法可以重现室内试验中孔隙率造成的试样应力路径的转变,初步证明所提方法的有效性。该方法为进一步从细观角度认识饱和土的不排水剪切特性提供基础。 |
| 英文摘要: |
| Given that the flexible coupling boundary is currently unable to simulate undrained triaxial tests in the discrete element method(DEM),the coupled fluid method(CFM) is integrated with a method for constructing a flexible coupled boundary,thereby extending the flexible coupling boundary to undrained triaxial simulations.Firstly,the CFM is used to simulate undrained triaxial tests of saturated soil with a rigid boundary,and the results are compared with the constant volume technique(CVM) to verify the reliability of the CFM.Secondly,the CU triaxial test simulation of saturated soil with a flexible coupling boundary is performed,and the simulation results are compared with those with a rigid boundary to demonstrate the advantages of a flexible boundary.Finally,the CFM-DEM model with a flexible coupled boundary is further used to simulate the CU triaxial tests of saturated soil with different initial porosity,and the undrained shear characteristics of specimens are investigated.The results reveal that the proposed method can reproduce the transformation of stress paths of specimens caused by porosity in laboratory triaxial tests,which proves the effectiveness of the proposed method.This method provides a foundation for future mesoscopic understanding of the undrained shear characteristics of saturated soils. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
