水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2014年
4期
107-111
,共5页
颗粒材料%滚动机制%剪切带%有效应变
顆粒材料%滾動機製%剪切帶%有效應變
과립재료%곤동궤제%전절대%유효응변
particle materials%rolling resistance%shear bands%effective strain
从宏观角度引入颗粒集合体有效应变表述颗粒材料剪切带的形成,从细观上模拟颗粒材料自由滚动、限制滚动、考虑滚动机制三种情况在外荷载下的力学响应。通过分析追踪颗粒材料有效应变的变化,探讨了颗粒材料剪切带的发展和形成过程。结果表明:限制滚动下不能模拟剪切带的发展,考虑颗粒自由滚动及滚动机制能较好的模拟剪切带的发展。而强调滚动机制限制了次要剪切带,同时促进主要剪切带的发展,因而能更有效的描述剪切带的形成过程。
從宏觀角度引入顆粒集閤體有效應變錶述顆粒材料剪切帶的形成,從細觀上模擬顆粒材料自由滾動、限製滾動、攷慮滾動機製三種情況在外荷載下的力學響應。通過分析追蹤顆粒材料有效應變的變化,探討瞭顆粒材料剪切帶的髮展和形成過程。結果錶明:限製滾動下不能模擬剪切帶的髮展,攷慮顆粒自由滾動及滾動機製能較好的模擬剪切帶的髮展。而彊調滾動機製限製瞭次要剪切帶,同時促進主要剪切帶的髮展,因而能更有效的描述剪切帶的形成過程。
종굉관각도인입과립집합체유효응변표술과립재료전절대적형성,종세관상모의과립재료자유곤동、한제곤동、고필곤동궤제삼충정황재외하재하적역학향응。통과분석추종과립재료유효응변적변화,탐토료과립재료전절대적발전화형성과정。결과표명:한제곤동하불능모의전절대적발전,고필과립자유곤동급곤동궤제능교호적모의전절대적발전。이강조곤동궤제한제료차요전절대,동시촉진주요전절대적발전,인이능경유효적묘술전절대적형성과정。
The macroscopic definition of effective strain was introduced to describe the emergence and development of shear bands in granular materials .Three different numerical tests (i .e .,free rolling test ,limiting rolling test and rolling resistance considered test ) using the discrete element method (DEM ) were conducted to simulate the mechanical response of granular specimens under stress .The progressive development of effective strain in the granular specimens was illus-trated to analyse the origination and evolution of shear bands .The results indicate that the evolution of shear bands in granular materials can be simulated more accurately in free rolling and rolling resistance considered tests ,while be hardly simulated when particle rolling is strictly prevented .In the case of particle rolling resistance ,the shear band evolution is more distinct as the evolution of the minor shear bands is limited while the major shear bands are preferably promoted .