本文選題：顆粒體 + 雙軸試驗��； 參考：《中南大學學報(自然科學版)》2016年01期

【摘要】：基于顆粒流離散單元法,采用2種壓實度控制標準,生成3種不同最小粒徑的顆粒體試樣,分別對其進行多組、多種數(shù)值試驗,從而揭示顆粒體最小粒徑與其宏觀力學特性及細觀力學響應(yīng)的關(guān)系,并分析最小粒徑對數(shù)值試驗結(jié)果精度的影響。研究結(jié)果表明:顆粒集合體試樣各力學參量與最小粒徑呈單調(diào)關(guān)系,經(jīng)推求可得出不同最小粒徑截距對應(yīng)的試樣抗變形能力;配位數(shù)與最小粒徑的對數(shù)呈較好的線性遞增關(guān)系,從細觀層面解釋了最小粒徑對試樣密實度及強度特性的影響;采用相對密度控制以及選擇較低的圍壓均能縮小由最小粒徑引起的試驗結(jié)果的差異。
[Abstract]:Based on the particle flow discrete element method, three kinds of granular samples with different minimum particle sizes were generated by using two kinds of compactness control criteria.The relationship between the minimum particle size and the macroscopic mechanical properties and the meso-mechanical response of the particle is revealed, and the effect of the minimum particle size on the accuracy of the numerical test results is analyzed.The results show that the mechanical parameters of particle aggregates show monotone relationship with the minimum particle size, and the deformation resistance of the samples corresponding to different minimum particle size intercept can be deduced, and the coordination number and the logarithm of the minimum particle size have a good linear increasing relationship.The influence of the minimum particle size on the compactness and strength characteristics of the sample is explained from the meso-level, and the difference of the test results caused by the minimum particle size can be reduced by using the relative density control and the selection of lower confining pressure.
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;武漢大學水工巖石力學教育部重點實驗室;
【基金】：國家自然科學基金資助項目(51379161) 國家優(yōu)秀青年科學基金資助項目(51322905)~~
【分類號】：TV41;TV641
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本文編號：1762418