Performance of RCC box drain under fluctuating depth of a road embankment

Abstract

The cross drain (CD) structure near to upcoming over bridge is falling under upcoming approaches and structure is loaded due to additional fill. The aim of this paper is to compare the overburden effect (up to 6m) on the CD by using two-dimensional analysis in STAAD_Pro_V8i and excel spreadsheet. Thirteen models of 1.5 m × 2.0 m size of the CD are analyzed and study the effect of an overburden on the axial and shear force, safe bearing capacity (SBC), sagging and moments and steel requirement. All stability check as per Indian Road Congress standard is satisfied. It is seen that the uniform 0.2 m thickens is required for all component of CD up to 6 m overburden. It is noted that, if a height of the cushion is an increase about a 1 m then live load distributed over the large area and which caused a reduction in mid-span moment to a certain extent. However, more than 1 m depth caused more mid-span moment due to superimposed load. It is finally concluded that an effect of depth of the cushion is governing after 5 m. That means no cushion case is performed as same there who have the 5 m depth of the cushion in identical SBC. Keywords: Embankment, Cross-drain, Soil structure interaction, Axial force, Sagging moment, Hogging moment