Influence of moisture content on the dynamic properties of an interlayer soil under cyclic loading
Fecha
2015-04-15Tipo de documento
conferenceObjectÁrea/s de conocimiento
IngenieríasMateria/s Unesco
3323 Tecnología de Los FerrocarrilesResumen
The ‘Interlayer’ soil (ITL) of the French conventional railways platforms, a coarse grain soil with low
permeability, was studied. Two samples of ‘interlayer’ soil were tested in a large scale triaxial cell (ø= 300
mm) at different hydric conditions: w = 4% (OPM) and w = 10% (Saturated). In each test, 5 different cyclic
loading levels (from ∆q = 10 kPa to ∆q = 30 kPa per cycle) and 3 simulated train speeds (100, 160 and 200
km/h) were considered. The loading levels simulate the real amplitude loading that arrives to the ITL depth in
a real railway platform. The results show the influences of the loading frequency and amplitude on the ITL
soils' cyclic behavior. In this paper, is presented the evolution of the elastic modulus and damping ratio forthe considered loadings under different hydric conditions. When loading amplitude is increased, the elastic
modulus and damping ratio decrease. Furthermore, the influence of loading frequency is found to be
negligible for the elastic modulus whereas is more notorious on the evolution of damping ratio when soil is
saturated.