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Physical and chemical ground improvement for sustainable transportation infrastructure under cyclic loads

Conference Paper


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Abstract


  • Railways form one of the major worldwide transportation networks and they continue to provide quick

    and safe public and freight transportation. In order to compete with other modes of transportation and

    to meet the ever growing demand of public and freight transport, railway industries face challenges to

    improve their efficiency and decrease the costs of maintenance and infrastructure. Large cyclic loading

    from heavy haul and passenger trains often leads to progressive deterioration of the track. The

    excessive deformations and degradations of the ballast layer and unacceptable differential settlement

    or pumping of underlying soft and compressible subgrade soils necessitate frequent costly track

    maintenance works. Hundreds of millions of dollars are spent each year for the construction and

    maintenance of rail tracks in large countries like the USA, Canada and Australia. A proper

    understanding of load transfer mechanisms and their effects on track deformations are essential

    prerequisites for designing the new track and rehabilitating the existing one. The reinforcement of the

    track by means of geosynthetics leads to significant reduction in the downward propagation of stresses

    and assures more resilient long-term performance. The geocomposite (combination of biaxial geogrid

    and non-woven polypropylene geotextile) serves the functions of reinforcement, filtration and

    separation, thereby reducing the vertical and lateral deformations.

    To stabilise subgrade soil under rail tacks and road embankments, two advanced ground improvement

    schemes have been introduced. Stabilization of soft subgrade soils using prefabricated vertical drains

    (PVDs) is essential for improving overall stability of track and reducing the differential settlement

    during the train operation. The effectiveness of using geocomposite geosynthetic and PVDs has been

    observed through field measurements and elasto-plastic finite element analyses. These have been the

    first fully instrumented, comprehensive field trials carried out in Australian Railways, and it was very

    encouraging to see the field observations matching the numerical predictions. Moreover, the

    improvement of an unstable formation soil with pH neutral chemical admixture and the sub-surface

    drainage is described. Internal erosional behaviour of lignosulfonate treated erodible soils has been

    studied using the Process Simulation Apparatus for Internal Crack Erosion (PSAICE) designed and

    built at the University of Wollongong (UOW). Effectiveness of lignosulfonate treated erodible soils on

    the erosion resistance has been investigated and its advantages over conventional methods are

    presented and discussed.

Publication Date


  • 2011

Citation


  • Indraratna, B., Rujikiatkamjorn, C., Vinod, J. J S. & Nimbalkar, S. (2011). Physical and chemical ground improvement for sustainable transportation infrastructure under cyclic loads. In S. Wardani (Eds.), Geotechnical Engineering for Disaster Mitigation and Rehabilitation and Highway Engineering 2011: Geotechnical and Highway Engineering, Practical Applications, Challenges and Opportunities (pp. 140-156). Semarang, Indonesia: Leading International Publisher.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1951&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/914

Start Page


  • 140

End Page


  • 156

Place Of Publication


  • Semarang, Indonesia

Abstract


  • Railways form one of the major worldwide transportation networks and they continue to provide quick

    and safe public and freight transportation. In order to compete with other modes of transportation and

    to meet the ever growing demand of public and freight transport, railway industries face challenges to

    improve their efficiency and decrease the costs of maintenance and infrastructure. Large cyclic loading

    from heavy haul and passenger trains often leads to progressive deterioration of the track. The

    excessive deformations and degradations of the ballast layer and unacceptable differential settlement

    or pumping of underlying soft and compressible subgrade soils necessitate frequent costly track

    maintenance works. Hundreds of millions of dollars are spent each year for the construction and

    maintenance of rail tracks in large countries like the USA, Canada and Australia. A proper

    understanding of load transfer mechanisms and their effects on track deformations are essential

    prerequisites for designing the new track and rehabilitating the existing one. The reinforcement of the

    track by means of geosynthetics leads to significant reduction in the downward propagation of stresses

    and assures more resilient long-term performance. The geocomposite (combination of biaxial geogrid

    and non-woven polypropylene geotextile) serves the functions of reinforcement, filtration and

    separation, thereby reducing the vertical and lateral deformations.

    To stabilise subgrade soil under rail tacks and road embankments, two advanced ground improvement

    schemes have been introduced. Stabilization of soft subgrade soils using prefabricated vertical drains

    (PVDs) is essential for improving overall stability of track and reducing the differential settlement

    during the train operation. The effectiveness of using geocomposite geosynthetic and PVDs has been

    observed through field measurements and elasto-plastic finite element analyses. These have been the

    first fully instrumented, comprehensive field trials carried out in Australian Railways, and it was very

    encouraging to see the field observations matching the numerical predictions. Moreover, the

    improvement of an unstable formation soil with pH neutral chemical admixture and the sub-surface

    drainage is described. Internal erosional behaviour of lignosulfonate treated erodible soils has been

    studied using the Process Simulation Apparatus for Internal Crack Erosion (PSAICE) designed and

    built at the University of Wollongong (UOW). Effectiveness of lignosulfonate treated erodible soils on

    the erosion resistance has been investigated and its advantages over conventional methods are

    presented and discussed.

Publication Date


  • 2011

Citation


  • Indraratna, B., Rujikiatkamjorn, C., Vinod, J. J S. & Nimbalkar, S. (2011). Physical and chemical ground improvement for sustainable transportation infrastructure under cyclic loads. In S. Wardani (Eds.), Geotechnical Engineering for Disaster Mitigation and Rehabilitation and Highway Engineering 2011: Geotechnical and Highway Engineering, Practical Applications, Challenges and Opportunities (pp. 140-156). Semarang, Indonesia: Leading International Publisher.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1951&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/914

Start Page


  • 140

End Page


  • 156

Place Of Publication


  • Semarang, Indonesia