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针对严寒地区高速铁路路基冻胀的最大变形量应小于5mm的严格要求,就填筑于高速铁路路基的微冻胀填料开展微观研究,以探索其冻胀的内在机制。由于高速铁路路基发生微冻胀时粗骨料和细骨料的相互作用的应力应变关系比较复杂,无法用简单的力学模型来描述细骨料的受力状态,所以应用物理类比法,将二者的相互作用关系利用一个理想的物理模型进行模拟,建立了微冻胀填料不完全填充的冻胀微观力学模型,推导了在细颗粒膨胀过程中细颗粒体积膨胀率与混合物体积变化之间的关系。对其冻胀过程进行了理论分析,得到了微冻胀填料冻胀应力应变路径。该研究成果有利于提高对微冻胀填料冻胀机理的认识。
In view of the severe deformation of subgrade frost heave in high-speed railway in severe cold area, the microstructures of micro-frost heave packing filled in high-speed railway subgrade should be studied to explore the inherent mechanism of frost heaving. As the stress-strain relationship of coarse aggregate and fine aggregate during the micro-frost heaving of high-speed railway subgrade is complex, it is impossible to describe the stress state of fine aggregate by simple mechanical model. Therefore, The interactions between the particles were modeled by an ideal physical model. The frost heave microstructure model was established with incomplete filling of the micro-frost heave filler. The relationship between the volume expansion of the fine particles and the volume change of the mixture during the expansion of the fine particles was deduced relationship. The frost heaving process is analyzed theoretically, and the frost heave stress-strain path of micro-frost heave packing is obtained. The research results are helpful to improve the understanding of frost heaving mechanism of micro-frost heave packing.