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| Particles discrete element simulation accumulation of gravel soil deformation parameter sensitivity analysis |
| Received:November 28, 2013 Revised:March 10, 2014 |
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| DOI：10.7511/jslx201502009 |
| KeyWord:landslide alluvial gravel soil virtual test micro-parameters sensitivity analysis |
| Author | Institution |
| 董辉 |
湘潭大学 土木工程与力学学院, 湘潭 ;湘潭大学 流变力学研究所, 湘潭 |
| 马一跃 |
湘潭大学 土木工程与力学学院, 湘潭 |
| 傅鹤林 |
中南大学 土木工程学院, 长沙 |
| 王智超 |
湘潭大学 土木工程与力学学院, 湘潭 ;湘潭大学 流变力学研究所, 湘潭 |
| 陈铖 |
湘潭大学 土木工程与力学学院, 湘潭 |
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| Abstract: |
| The author uses the granular discrete element method to simulate the arbitrary shape stone and calibrate the mesoscopic parameters of gravel soil which was mainly constituted by weathering, unloading, alluvial, deluvial, etc. Calibration is based on indoor triaxial compression experiments measured data at the same time considering the scale effect of sample. This paper analyzed the sensitivity of the mesoscopic parameters which affection the accumulation of gravel soil macro deformation characteristics through the virtual experiment. Studies have shown that:① The mesoscopic parameters of gravel soils based on indoor experimental calibration relative error is within 5%.② The size of the virtual experiment include model 1(101 mm×200 mm) and the model 2(300 mm×600 mm). The model 2 to mesoscopi parameters calibration has scale effect, but the relative error controlled within 9%.③ There are nonlinear positive relationships between the coefficient of friction of discrete element particles and the angle of internal friction, and the shear strength, and the residual strength. When the friction coefficient increased by 0.1, the peak deviator stress average increased 118.85 kPa and the residual strength average increased 90.44 kPa.④ The greater the confining pressure, the weaker the material dilatancy is, when the confining pressure is changing between 100 kPa~500 kPa, the dilatancy characteristic value K is obtained from 3 to 6. The cohesive force of the damaged model nearly increases linearly as confining pressure increases. ⑤ The greater the Young's modulus, the greater the shear strength of the gravel soil is, but there is not a linear relationship between them. Moreover, Young's modulus does not affect residual strength of material significantly. |
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