Abstract
ABSTRACT The cohesionless soil overburden experiences large vertical displacements when shallow jacked box tunnel is constructed through it. A modelled steel box tunnel was jacked through cohesionless soil filled tank in different conditions. The overburden soil was reinforced with ‘one’ and ‘two’ rows of steel nails to control its displacements during box jacking operation under loading. The study shows that the vertical displacement of overburden with ‘two’ rows of nails were reduced by 81% as compared to ‘without nail’ conditions for a typical loading intensity of 365 kN/m2. The load carrying capacity of overburden soil was also increased by 134% corresponding to a particular value of displacement as 5.6 mm from ‘without nail’ to ‘two’ rows nailed case. The results of the model study have been validated with PLAXIS 3D and were found in good agreement.
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