| 徐文杰,张海洋,许强,于玉贞.土石混合体直剪离散元数值试验研究[J].计算力学学报,2014,31(2):228~234 |
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| 土石混合体直剪离散元数值试验研究 |
| Numerical simulations of direct shear test with soil-rock mixture using discrete element method |
| 投稿时间：2012-11-02 修订日期：2013-04-09 |
| DOI：10.7511/jslx201402015 |
| 中文关键词: 土石混合体 离散元 直剪试验 细观结构 多尺度试验 |
| 英文关键词:soil-rock mixture (S-RM) discrete element method (DEM) direct shear test meso-structure multi-scale test |
| 基金项目:国家自然科学基金青年基金（51109117）；清华大学自主科研计划（20111081125）；地质灾害防治与地质环境保护国家重点实验室开放基金（SKLGP2014K019）资助项目. |
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| 中文摘要: |
| 工程中普遍存在的土石混合体以其复杂的工程地质力学性质越来越受研究者的关注。由于“块石”的存在使得土石混合体在细观层次上呈现明显的结构性特征，这种结构性将影响甚至控制着其变形破坏机制及宏观力学特征。本文借助三维颗粒离散元分析软件YADE分别从含石量、试样尺寸、强度特性等角度对土石混合体的力学性质开展了一系列的数值直剪试验研究工作，并取得了一些有意义的研究成果：在含石量及粒度组成相同的情况下土石混合体的宏观抗剪强度及剪胀性随着试样尺寸的增加而呈现降低趋势，而在相同试样尺寸下将随着含石量的增加而增加；内部块石的存在影响着其细观应力状态，从而影响其宏观力学特性。 |
| 英文摘要: |
| Researchers pay more and more attentions on the study of soil-rock mixture (S-RM) because of the complexity of its engineering geo-mechanical characteristics.The structural property is one of the important factors on the failure mechanism and the macro mechanical characteristics of S-RM.Using an open-source software developed for numerical simulations using discrete modeling methods—YADE,a series of direction shear tests are performed to study the effections of the rock block content and the sample scale on the mechanical characteristics of S-RM.From these studies some significant conclusions are drawn:under the same rock block content and grain-size composition,the macro shear strength and the dilatancy behavior of S-RM will decrease with sample scale's increasing; and under the same scale,the macro shear strength and the dilatancy behavior of S-RM will increase with increasing rock block content; the rock blocks have great effects on the meso-stress field,and effect on the macro mechanical characteristics of the sample. |
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