A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Arching Effects in Box Jacking Projects
Box culverts are an essential component of highways and railroads since they transfer storm runoffs from upstream to downstream. Box jacking (BJ) is a trenchless technology method to install box culverts under embankments of existing highways and railroads with minimum surface disruptions. Over excavation (overcut) during box jacking operations is required to facilitate steering and reduce friction forces. Surrounding soils may collapse into the annular space during or after project box jacking and cause soil movements. Soil movement is reduced away from top of the box due to arching effect. Arching is a mechanism where soil particles are prevented from collapsing completely above the installed pipe/box and consequently less load is applied to pipe/box. The objective of this paper is to investigate the applicability of available empirical methods to estimate soil vertical displacements in box jacking projects and compare their results with a case study. Finite element modeling (FEM) using PLAXIS 2D is used to simulate box jacking operations. Data is collected from a box jacking project to validate the FEM model.
Arching Effects in Box Jacking Projects
Box culverts are an essential component of highways and railroads since they transfer storm runoffs from upstream to downstream. Box jacking (BJ) is a trenchless technology method to install box culverts under embankments of existing highways and railroads with minimum surface disruptions. Over excavation (overcut) during box jacking operations is required to facilitate steering and reduce friction forces. Surrounding soils may collapse into the annular space during or after project box jacking and cause soil movements. Soil movement is reduced away from top of the box due to arching effect. Arching is a mechanism where soil particles are prevented from collapsing completely above the installed pipe/box and consequently less load is applied to pipe/box. The objective of this paper is to investigate the applicability of available empirical methods to estimate soil vertical displacements in box jacking projects and compare their results with a case study. Finite element modeling (FEM) using PLAXIS 2D is used to simulate box jacking operations. Data is collected from a box jacking project to validate the FEM model.
Arching Effects in Box Jacking Projects
Mamaqani, Babak (author) / Najafi, Mohammad (author)
Pipelines 2015 ; 2015 ; Baltimore, Maryland
Pipelines 2015 ; 145-153
2015-08-17
Conference paper
Electronic Resource
English
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