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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。
In order to verify the rationality of the contact model and its parameters in natural sand-soil discrete element simulation, a set of test device for the formation of ideal cement particles and the realization of contact mechanics under different loading conditions was designed. A cementitious material with a specific geometry was formed between two aluminum rods of the same size by a cementing pelletizing device. Subsequently, a series of auxiliary loading devices were used to test the mechanical properties of the cemented particles under simple and complex loading conditions. The experimental results show that the device can be used to test the mechanical properties of cemented particles under different loading conditions. The measured mechanical contact of cemented particles basically agrees with the contact model of natural sand discrete element, and the shear strength and torsional strength are both The normal pressure increases and increases, in the three-dimensional stress space, the strength of the cement grain envelope is elliptical paraboloid.