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本文利用动力三轴仪模拟列车荷载作用下铁路路堑中超固结粘性土的受力情况。研究了在列车荷载作用下该土的动应力与动应变的关系及轴向永久变形的若干规律。证实了原状超固结粘性土在列车荷载作用下动应力与动应变的关系属应变软化型,且可用 R.L.Kondner 双曲线表达。另外也得到固结比 K_c,静压σ_3,动应力σ_d 与土的轴向永久变形间的一些规律。这些均可作为防治基床病害措施的参考。
In this paper, the dynamic triaxial apparatus is used to simulate the force of overconsolidated cohesive soil in railway cutting under the train load. The relationship between dynamic stress and dynamic strain of the soil and some regularities of axial permanent deformation under train load are studied. It is confirmed that the relationship between dynamic stress and dynamic strain of undisturbed overconsolidated clay is strain softening under the action of train load and can be expressed by R.L.Kondner hyperbola. In addition, some regularities such as consolidation ratio K_c, static pressure σ_3, dynamic stress σ_d and soil axial permanent deformation are also obtained. These can be used as a reference to prevent bed disease measures.