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| Discrete element simulation of soil-rock mixture under biaxial compression under undrained condition |
| Received:May 18, 2021 Revised:July 27, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210519001 |
| KeyWord:soil-rock mixture DEM undrained stone content macroscopic and mesoscopic properties |
| Author | Institution |
| 胡军霞 |
嘉兴南洋职业技术学院 船舶与建筑分院, 嘉兴 |
| 马一跃 |
浙江交工集团股份有限公司, 杭州 |
| 张仕贤 |
浙江交工集团股份有限公司, 杭州 |
| 董辉 |
湘潭大学 土木工程与力学学院, 湘潭 |
| 余巍 |
浙江交工集团股份有限公司, 杭州 |
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| Abstract: |
| An undrained biaxial compression model with a flexible boundary considering the shape of macadam is constructed by the discrete element method.The macro-meso mechanical properties of 11 groups of soil-rock mixtures with different stone contents under undrained conditions were studied.It is found that: (1) The strength of the soil-rock mixture increases at first and then decreases with the increase of stone contents.The strength of the crushed stone skeleton formed by the mixture containing more than 60% stone increases rapidly.The maximum strength and internal friction angle are obtained when the stone content is about 80%.The cohesion of the mixture decreases with the increase of stone contents.(2) Under undrained loading,the pore water pressure of the soil-rock mixture is first positive and then negative first increases and then decreases.When the stone contents are small,the change of pore water pressure of macadam mixture is small.The pore water pressure of the mixture increases at the initial stage of the formation of the crushed stone skeleton,and the maximum pore water pressure of the macadam skeleton decreases.(3) The strain localization of soil-rock mixture with stone contents less than 30% is a regular shear zone.The stone contents increases to destroy regular shear,and when the stone contents are about 80%,the mixture forms a regular shear zone.With the increase of stone contents,the coordination number decreases gradually,and the indirect contact force of particles increases slowly with the increase of stone contents when the stone contents are less than 60%,and increases rapidly when it exceeds 70%. |
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