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旨在提出考虑胶结厚度影响的三维胶结接触模型,并用于结构性砂土宏观力学特性的离散元模拟。首先,结合结构性砂土内胶结物质的力学性质与存在形式,通过简化水泥胶结铝棒接触力学特性的实测结果,提炼出用于模拟结构性砂土颗粒间胶结作用的三维胶结接触模型;其次,将该胶结模型植入三维离散元商业软件PFC3D,进行拉伸、压缩以及剪切试验的双球验证;最后,使用PFC3D对2%水泥含量的胶结砂土在不同围压条件下的三轴压缩试验进行模拟。结果表明:引入胶结接触模型的离散元数值试验可以较好地反映室内试验中胶结砂土的宏观力学特性。
The aim is to propose a three-dimensional cement contact model that takes into account the influence of cementation thickness and is used for the discrete element simulation of macroscopic mechanical properties of structural sand. Firstly, based on the mechanical properties and existing forms of the cemented material in the structural sand, the three-dimensional cemented contact model for simulating the intergranular cementing between the structural sand particles is refined by simplifying the measured results of the mechanical properties of the cemented carbide rod. Secondly, , The cement model was implanted into three-dimensional discrete element commercial software PFC3D for tensile and compression tests and two-ball verification of shear tests. Finally, the PFC3D was used to test the three-axis model of cemented sand with 2% cement content under different confining pressures Compression test to simulate. The results show that the discrete element numerical test introduced into the cemented contact model can well reflect the macroscopic mechanical properties of cemented sand in laboratory tests.