| 胶结颗粒接触力学特性测试装置研制 |
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| 引用本文： | 蒋明镜,孙渝刚,李立青.胶结颗粒接触力学特性测试装置研制[J].岩土力学,2011,32(1):309-315. |
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| 作者姓名： | 蒋明镜 孙渝刚 李立青 |
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| 作者单位： | 1. 同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家杰出青年科学基金（No. 51025932）；国家自然科学基金（No. 10972158）。 |
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| 摘 要： | 为验证天然结构性砂土离散元模拟中接触模型及其参数的合理性，设计了一套用于理想胶结颗粒成型及实现不同加载条件下接触力学特性测试装置。通过胶结颗粒成型装置在两大小相同的铝棒间形成具有特定几何尺寸的胶结物，随后，采用一系列辅助加载装置实现简单及复杂加载条件下胶结颗粒接触力学特性的测试。试验结果表明：该装置可用于胶结颗粒在不同加载条件下接触力学特性的测试，实测胶结颗粒接触力学响应与天然砂土离散元中接触模型基本相符，且其抗剪和抗扭强度均随着法向压力的增大而增大，在三维应力空间中胶结颗粒强度包线呈椭圆抛物面状。
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| 关 键 词： | 胶结颗粒 接触力学特性 复杂加载条件 试验装置 |
| 收稿时间： | 2010-03-30 |
Development of experimental apparatus for contact behaviour of bonded granules |
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| JIANG Ming-jing,SUN Yu-gang,LI Li-qing.Development of experimental apparatus for contact behaviour of bonded granules[J].Rock and Soil Mechanics,2011,32(1):309-315. |
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| Authors: | JIANG Ming-jing SUN Yu-gang LI Li-qing |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | An apparatus for specimen preparation and test on contact behaviour of idealized bonded granules is designed, which can be applied into the verification of contact model and parameter rationality for natural structured sand in the discrete element method (DEM). By using the specimen preparation devices, two aluminum rods with the same size are glued together by adhesive in a pre-defined mode. By using the auxiliary loading devices, the mechanical behaviours of contact between the bonded rods are obtained under simple and complicated conditions. The results show that the apparatus can be used effectively in test on contact behaviour of the bonded rods. The mechanical behaviours of contact between bonded rods agree well with the bonded materials contact model implemented by the discrete element method. The peak shear and rotational strength of the bonds increase with the increasing of normal force. The strength envelope in the normal-torsion-shear stress space is an elliptic paraboloid shell. |
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| Keywords: | bonded granules contact behaviour complex loading condition experimental apparatus |
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