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Selection of geological parameters for design of footings on basaltic rock

Author Affiliations

  • 1Noble Geostructs, Mumbai, India
  • 2Geosystems Infrastructure, Mumbai, India

Res. J. Engineering Sci., Volume 10, Issue (3), Pages 43-47, September,26 (2021)

Abstract

Infrastructure development is part of social and national development. Various highway and railway projects consist of tunnels and bridges in the state of Maharashtra. As we are developing the infrastructure projects, various geological and design issues have been faced by project design and civil construction team. Geologically Deccan traps in the state of Maharashtra consist of Basaltic rock with high unconfined compressive strength (UCS) (70-250MPa). Based on Geological and Geotechnical investigation, project alignment and structural components are finalized. The physical and geo-mechanical properties on the recovered rock samples are determined and the design parameters are estimated. Based on the various bridge foundation project issues in Deccan trap, it is observed that chances of foundation damage cannot be ruled out due to high variation in UCS value of basalt rock. It is also observed that variation in rock class during the investigation stage and actual construction stage. In some projects in Deccan trap region, rock mass classification is done on the basis of RQD only. Total core recovery factors (TCR) is not considered and the rock mass data is analysed. But during construction stages design parameters determined are interpreted on a different scale. In this paper provisions in Engineering standard codes are reviewed and an attempt is made to propose practical solution for geological and foundation design issue in basaltic rock.

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