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— Introduction Granular ballast is a major component of the railway track substructure controlling largely the track geometry deterioration Correct predictions of ballast layer requirements are crucial as under dimensioning implies a risk for structural failure and large maintenance costs and over dimensioning implies unnecessary large
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— In this paper the effect of ballast properties including ballast depth shoulder width shoulder height inter particle friction angle and ballast porosity on track buckling capacity are
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— We investigated the dynamic behavior of a railway ballast layer during tamping operation by 3D Discrete Element simulations The ballast layer was prepared with ballast grains that had a realistic shape and was measured by a laser scanner and modeled by clumped spheres using the dynamic optimization technique
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Under train induced loads ballast penetration significantly increases the porosity of soil samples near the ballast subgrade interface and causes significant lateral deformation at the contact interface Saturated specimens with higher porosity can experience mud pumping under relatively low dynamic stress
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— The dynamic behavior of a railway ballast layer during tamping operation is studied in Kim et al by using 3D DEM simulations Three types of sleeper models in the ballast layer were considered under a series of tamping operations lifting the sleeper insertion of vibrating tines and packing pulling out of tines hammers and settling
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— In the context of sandy fouled ballast porosity determines the material s ability to drain water and simultaneously affects its mechanical behavior under train loads High porosity of the same material can lead to lower shear strength due to reduced contact between particles resulting in decreased interparticle friction and cohesion
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about the new Canadian Pacific Rail ballast specif i cation which was partially based on the findings presented by Raymond et al Cl>· The selection of the top ballast hereafter re ferred to as ballast used for railway track support is
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— In the context of sandy fouled ballast porosity determines the material s ability to drain water and simultaneously affects its mechanical behavior under train loads High porosity of the same material can lead to lower shear strength due to reduced contact between particles resulting in decreased interparticle friction and cohesion
— We characterize an industrial process currently used on railway track tamping operation This process is employed in order to restore the geometry of railway track distorted by train traffics The main goal is to compact the granular material under the sleepers supporting the railroad squeezing and vibrations
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— Because ballast keeps undergoing and dissipating most of the train loadings furthermore the train speed and freight weight are increasing causing more intensive loadings to ballast
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— The strain produced by the first load cycle is mainly dependent on initial ballast porosity and the applied stresses It would appear that for the low stresses a suitable approximation may be that the strain is a linear function of the axial stress whereas for the higher stresses nearer the failure conditions the strain may be
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— We characterize an industrial process currently used on railway track tamping operation This process is employed in order to restore the geometry of railway track distorted by train traffics The main goal is to compact the granular material under the sleepers supporting the railroad squeezing and vibrations
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— The method is then extended to realistic railway ballast including the effects of ballast fouling It is shown that when the flow begins to overtop the ballast the free surface shifts to greatly increase the chance of ballast scouring Before beginning our comparison we must determine the porosity of the ballast from the reported
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— Railway ballast is a layer of coarse stones located beneath the track and around the sleepers Its primary function is to provide drainage support the track vertically and to provide lateral
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— Values of flow resistivity porosity viscous characteristic length and tortuosity either measured non acoustically or deduced from impedance tube data for railway ballast and porous concrete have
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— Railway ballast tamping operation is an important work in the railway line maintenance and renewal operation which is employed to restore the initial geometry of railway track distorted by train
— We characterize an industrial process currently used on railway track tamping operation This process is employed in order to restore the geometry of railway track distorted by train traffics The main goal is to compact the granular material under the sleepers supporting the railroad squeezing and vibrations
WhatsApp:+86 15836135778
— Despite ongoing research the parametrisation of a DEM model is a challenging task as it depends strongly on the particle shape representation used particle particle contact law and the simulated applications for railway ballast lab tests or track conditions The authors previously modelled railway ballast with a DEM model using a
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— In contrast for fouled ballast the conductivity can be many orders of magnitude less The railway ballast should have sufficient permeability for drainage This permeability is a product of the connected porosity [8] of the ballast structure The standard model for the flow of fluid through porous media is the well known Darcy Law
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— Measurement of the porosity of ballast The porosity is the other important and fundamental parameter required to describe the acoustic property of porous materials This is defined as the ratio of the voids to the total volume of the sample A measurement method has been devised to determine the porosity of the 1 5 scale ballast
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— Ballast bed deterioration changes the ballast track geometry which leads to uncomfortable rides exacerbates wheel rail interactions and most importantly causes safety issues derailment To align the track geometry tamping is the most widely used means of filling ballast sleeper gaps and homogenizing ballast beds
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— Railroad ballast is uniformly graded coarse aggregate placed between and immediately underneath the ties to provide drainage and structural support for the loading applied by trains In the United States several ballast gradation recommendations are suggested by the American Railway Engineering and Maintenance of Way Association
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— When the railway in desert areas adopts ballasted track structure due to the voids between ballast in the ballast bed [7] [8] the sand will invade and sink continuously under the coupling action of wind and train load which will gradually reduce the ballast voids increase the the particle arrangement of the ballast bed and the
— 1 Introduction In Lithuania railway transport is a one of the leading GDP Gross Domestic Product producer among all transport modes The length of the railway in Lithuania makes up km [1] and it is very important to maintain the existing and newly constructed tracks in its best possible have many advantages over
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— The most compacted density of the tuff sample was kg/m 3 and the corresponding porosity ratio was Model Test of Geogrid Reinforced Railway Ballast Track Subgrade The ballasted railway model test system developed by Zhejiang University was used in this test which can not only apply vertical load to the test object
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— 1 Introduction Today mainly in the last decades railroad transportation will have a significant role in development and civilization In the 1800s and 1900s more and more railway lines were constructed worldwide [1] There were main tasks that had to be solved developing the hauling force of the railway engines; continuously changeover
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— The main functions of the ballast layer are distribution of train loads from superstructure to subgrade and provision of the required drainage for the track The particle size distribution must coordination number increased and the porosity decreased Al Raoush captured the images of sand particles by using x ray
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