A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Application of Flowable Soil as Sustainable Backfill for Railway Track Stiffness Reinforcement at Bridge Transition Zone
In the railway track system, the abrupt change of track stiffness at the bridge transition zone leads to the faster degradation of track geometry, causing higher maintenance and rehabilitation costs. Many strategies have been introduced to solve this problem from geometry design to track stiffness equalization. Hence, this research focus on the development of new flowable backfill material for the railway bridge approach which has the combined effect of lightweight soil and strong resilient modulus. To cope with this objective, many laboratory experiments were conducted to determine the engineer properties of flowable soil from fresh to hardened stages. Then, the Finite Element (FE) model is integrated to simulate the behavior of flowable soil under different train speeds, passenger, and freight train types. The test results suggest that it is promising to use the flowable soil having foam as a proper backfill of the railway bridge approach since the low-weight properties help reduce the pressure to the below weak soil subgrade. The FE simulation also reveals that the settlement resistance of flowable soil is improved compared to the conventional cement-treated base. The high self-leveling characteristic of this material is expected to meet the strict requirement for wedge-shape application. In general, it is encouraged to use flowable soil as a sustainable backfill of the railway bridge approach zone .
Application of Flowable Soil as Sustainable Backfill for Railway Track Stiffness Reinforcement at Bridge Transition Zone
In the railway track system, the abrupt change of track stiffness at the bridge transition zone leads to the faster degradation of track geometry, causing higher maintenance and rehabilitation costs. Many strategies have been introduced to solve this problem from geometry design to track stiffness equalization. Hence, this research focus on the development of new flowable backfill material for the railway bridge approach which has the combined effect of lightweight soil and strong resilient modulus. To cope with this objective, many laboratory experiments were conducted to determine the engineer properties of flowable soil from fresh to hardened stages. Then, the Finite Element (FE) model is integrated to simulate the behavior of flowable soil under different train speeds, passenger, and freight train types. The test results suggest that it is promising to use the flowable soil having foam as a proper backfill of the railway bridge approach since the low-weight properties help reduce the pressure to the below weak soil subgrade. The FE simulation also reveals that the settlement resistance of flowable soil is improved compared to the conventional cement-treated base. The high self-leveling characteristic of this material is expected to meet the strict requirement for wedge-shape application. In general, it is encouraged to use flowable soil as a sustainable backfill of the railway bridge approach zone .
Application of Flowable Soil as Sustainable Backfill for Railway Track Stiffness Reinforcement at Bridge Transition Zone
Sustain. Civil Infrastruct.
Kim, S. Sonny (editor) / Moghal, Arif Ali Baig (editor) / Yao, Jia-liang (editor) / Lee, Tack-Woo (author) / Le, Tri Ho Minh (author) / Park, Dae-Wook (author) / Seo, Jung-Woo (author)
Civil Infrastructures Confronting Severe Weathers and Climate Changes Conference ; 2021 ; NanChang, China
2021-07-14
10 pages
Article/Chapter (Book)
Electronic Resource
English
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