Pile cap construction is one of the activities in deep foundations that requires shoring arrangement in particular conditions when excavation is below the ground level. Special care to be taken when shoring to be carried out nearby railway embankment with live track. A similar type of condition is encountered during the construction of pile cap size of 17.0 m × 12.6 m in one of the projects. The construction of pile cap requires controlled deep excavation near railway embankments with excavation depth ranging from 8.0 m to 10.0 m. The major live railway track exists over the embankment. The distance from the center of the railway track to edge of shoring system is about 10.0 m. Innovative shoring system adopted by considering the different depth of retaining height. On the embankment side, contiguous pile wall is proposed while other 3 sides of excavation, secant pile wall is proposed. Secant pile wall is formed by overlapping soft and hard concrete piles and contiguous piles are formed by constructing touch concrete piles with structural beam as reinforcement. This paper discusses the analysis of shoring systems using finite element software like WALLAP and PLAXIS 2D. Railway surcharge is applied by considering the actual weight of ballast and locomotive. Comparison of forces with PLAXIS 2D and WALLAP carried out and maximum of both were taken to ensure safety in shoring system design.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Study of Shoring System to Protect Railway Embakment During Deep Excavation

  • D. Nagarajan,
  • K. Raja Rajan,
  • T. Vijayakumar

摘要

Pile cap construction is one of the activities in deep foundations that requires shoring arrangement in particular conditions when excavation is below the ground level. Special care to be taken when shoring to be carried out nearby railway embankment with live track. A similar type of condition is encountered during the construction of pile cap size of 17.0 m × 12.6 m in one of the projects. The construction of pile cap requires controlled deep excavation near railway embankments with excavation depth ranging from 8.0 m to 10.0 m. The major live railway track exists over the embankment. The distance from the center of the railway track to edge of shoring system is about 10.0 m. Innovative shoring system adopted by considering the different depth of retaining height. On the embankment side, contiguous pile wall is proposed while other 3 sides of excavation, secant pile wall is proposed. Secant pile wall is formed by overlapping soft and hard concrete piles and contiguous piles are formed by constructing touch concrete piles with structural beam as reinforcement. This paper discusses the analysis of shoring systems using finite element software like WALLAP and PLAXIS 2D. Railway surcharge is applied by considering the actual weight of ballast and locomotive. Comparison of forces with PLAXIS 2D and WALLAP carried out and maximum of both were taken to ensure safety in shoring system design.