Abstract
In view of the dynamic response of geogrid-reinforced gravel under high-speed train load, this paper explores the dynamic characteristics of geogrid-reinforced gravel under semi-sine wave cyclic loading. A number of large scale cyclic triaxial tests were performed on saturated gravelly soil reinforced with geogrid to study the influence of the number of reinforcement layers and loading frequencies on the dynamic responses of reinforced gravelly sand subgrade for high speed rail track. The variation of cumulative axial and volumetric strains, excess pore pressure and resilient modulus with number of loading cycles, loading frequency, and reinforcement arrangement are analyzed. The test results reveal that the cumulative axial strain decreases as the number of reinforcement layers increases, but increases with loading frequency. The resilience modulus increases with the number of reinforcement layers, but decreases as the loading frequency increases. The addition of geogrid can reduce the excess pore water pressure of the sample, but it can slightly enhance the rubber mold embedding effect of the sand sample. As the loading frequency increases, the rubber mold embedding effect gradually weakens.
Highlights
Much research has been conducted on the behavior of sand under cyclic loading using cyclic triaxial tests, with the focus being on the effects of confining pressure, loading amplitude and frequency, over-consolidation ratio, fine particle content, and relative density, etc. [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
Zhang et al [23] studied the effects of confining pressure, initial shear stress, cyclic stress ratio, and loading frequency on the dynamic strength characteristics of saturated sand in Wenchuan
In view of the dynamic response of geogrid-reinforced gravel under high-speed train load, this paper explores the dynamic characteristics of geogrid-reinforced gravel under semi-sine wave cyclic loading
Summary
With the vigorous development of high-speed train in China, the amplitude, frequency, and number of loadings on the subgrade have greatly increased.This increases the rate of stiffness degradation and accumulation of deformation of the subgrade filling layer, which in turn increases the stress in the underlying ground layer, resulting in excessive settlement or differential settlement [1].Much research has been conducted on the behavior of sand under cyclic loading using cyclic triaxial tests, with the focus being on the effects of confining pressure, loading amplitude and frequency, over-consolidation ratio, fine particle content, and relative density, etc. [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. With the vigorous development of high-speed train in China, the amplitude, frequency, and number of loadings on the subgrade have greatly increased. This increases the rate of stiffness degradation and accumulation of deformation of the subgrade filling layer, which in turn increases the stress in the underlying ground layer, resulting in excessive settlement or differential settlement [1]. Zhang et al [23] studied the effects of confining pressure, initial shear stress, cyclic stress ratio, and loading frequency on the dynamic strength characteristics of saturated sand in Wenchuan. The authors found that the dynamic strength of saturated sand increases with the increase in confining pressure and loading frequency
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