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| Research on mesoscopic-macroscopic mechanical parameters correlation of accumulation of gravel soil based on three dimensional discrete element |
| Received:October 08, 2014 Revised:December 11, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201601012 |
| KeyWord:accumulation of gravel soil micro parameters cohesive force internal friction angle discrete element |
| Author | Institution |
| 马石城 |
湘潭大学 土木工程与力学学院, 湘潭 |
| 胡军霞 |
湘潭大学 土木工程与力学学院, 湘潭 |
| 马一跃 |
湘潭大学 土木工程与力学学院, 湘潭 |
| 董辉 |
湘潭大学 土木工程与力学学院, 湘潭 |
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| Abstract: |
| Based on indoor triaxial compression test, using the discrete element software PFC3D generated 1:1 accumulation of gravel soil numerical model, which has different shape stone and its corresponding micro parameters is obtained by calibration (relative error control within 10%).Changing micro parameters had been discussed quantitatively its relationship with macroscopic mechanical parameters (cohesive force and internal friction angle), got more mesoscopic parameters and the cohesive force, internal friction angle equation, furthermore its reliability had been verified.The study found (1)The relationship of cohesive force with contact cohesive force, grain friction coefficient was of linear regression; At the same time, influenced by bond ratio M=σc/τc also, when M<1, the cohesive force of linear increase with the increase of M, and when M≥4, cohesive force to be stabilize.(2)The relationship between internal friction angle and friction coefficient of particles is logarithmic, and parabola relationship to the contact adhesive power.(3)According to the c, φ gotted by indoor test with moisture content of 9% and 11%, used the micro-macro parameter equation to calculate the micro parameters.And its virtual-indoor test results of relative error was within 10%.Fine-macro mechanics equation were reliable, and it can provide the reference to subsequent soil-rock-mixture micro parameters calibration of virtual experiment. |
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