| 考虑颗粒破碎的堆石体三维随机多面体细观数值模拟 |
| |
| 引用本文： | 马刚,周伟,常晓林,周创兵.考虑颗粒破碎的堆石体三维随机多面体细观数值模拟[J].岩石力学与工程学报,2011,30(8):1671-1682. |
| |
| 作者姓名： | 马刚 周伟 常晓林 周创兵 |
| |
| 作者单位： | (武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉 430072) |
| |
| 基金项目： | 国家自然科学基金杰出青年基金资助项目(50725931);国家自然科学基金资助项目(50779047,50979082) |
| |
| 摘 要： | 基于随机颗粒不连续变形模型，在颗粒的细观单元之间插入界面单元，采用黏聚力裂缝模型模拟界面单元的起裂、扩展和失效，研究颗粒破碎对堆石体强度和变形的影响。从宏观、细观2个层面分析细观数值模拟结果，结果表明：本文提出的方法能直接模拟三维颗粒破碎现象，颗粒破碎降低堆石体的强度，其机制在于颗粒破碎弱化堆石体的剪胀性能，使得由于剪胀引起的内摩擦角显著降低，颗粒破碎的影响随围压的增加而增大；颗粒破碎时伴随着声发射，高围压下声发射数多于低围压下，表明高围压下颗粒破碎更明显，与试验结果一致；在剪切过程中，颗粒间接触法向逐渐由水平方向向竖直方向倾斜，法向接触力的主方向与加载方向相同，颗粒间平均法向接触力逐渐增大。
|
| 关 键 词： | 水利工程堆石体颗粒破碎细观力学随机模拟黏聚力模型 |
| 收稿时间： | 2010-12-24; |
MESOSCOPIC NUMERICAL SIMULATION OF ROCKFILL CONSIDERING PARTICLE BREAKAGE BY USING THREE-DIMENSIONAL STOCHASTIC POLYHEDRONS |
| |
| MA Gang,ZHOU Wei,CHANG Xiaolin,ZHOU Chuangbing.MESOSCOPIC NUMERICAL SIMULATION OF ROCKFILL CONSIDERING PARTICLE BREAKAGE BY USING THREE-DIMENSIONAL STOCHASTIC POLYHEDRONS[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1671-1682. |
| |
| Authors: | MA Gang ZHOU Wei CHANG Xiaolin ZHOU Chuangbing |
| |
| Affiliation: | (State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China) |
| |
| Abstract: | Based on the stochastic granular discontinuous deformation(SGDD) method,a cohesive zone model is employed to simulate the breakage of coarse aggregates.In this model the cohesive interface elements are inserted into the region of coarse aggregates;and the constitutive response of cohesive element is governed by an energy-based damage evolution law.If the interface between these sub-particles breaks,the breakage will happen.By using this model,it is possible to study the influence of particle breakage on the... |
| |
| Keywords: | hydraulic engineering rockfill particle breakage mesomechanics stochastic simulation cohesive zone model |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《岩石力学与工程学报》浏览原始摘要信息 |
|
点击此处可从《岩石力学与工程学报》下载全文 |
