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基于离散单元法颗粒流理论,土体颗粒单元间采用接触黏结模型中来考虑冻土中冰的胶结作用,建立了冻结砂土的颗粒流模型。通过改变计算模型中颗粒单元的参数,模拟了在不同冻结温度以及不同围压下冻结砂土的宏观力学性质,并与冻结砂土的室内试验结果进行了比较,结果表明:颗粒流方法可以较好地模拟冻结砂土的应力-应变关系以及剪切带的发展变化过程,颗粒流细观参数对温度具有显著的依赖性。研究结果对离散单元法在特殊土中的应用具有一定的理论和应用价值。
Based on the discrete element method particle flow theory, the cementation of ice in frozen soil is considered in the contact-bonded model of soil particles, and the particle flow model of frozen sand is established. The macroscopic mechanical properties of the frozen sand under different freezing temperatures and different confining pressures were simulated by changing the parameters of the granular units in the calculation model. The results were compared with those of the frozen sandy soil. The results show that the particle flow method can compare The stress-strain relationship of frozen sand and the development and change of shear zone are well simulated. The fine-grained parameters of particle flow have a significant dependence on temperature. The research results have certain theoretical and applied value to the application of discrete element method in special soil.