The case study of a comprehensive geotechnical investigation (IS 1892: 1979) Code of practice for subsurface investigation for foundations [1]) evaluates the suitability of the sub-soil strata for laying the foundation of various structures along the HORC project, spanning 140 km from Palwal to Harsanakalan in Haryana. Analysis of test results revealed a mix of fine and coarse-grained soil with predominantly cohesionless soil layers along the alignment, as illustrated in the detailed lithological profile. A correlation between field and laboratory parameters was established to derive soil design parameters and determine the SBC. A chart developed from these correlations to estimate the variation in angle of internal friction and bulk unit weight at different depths corresponding to SPT-N (IS 2131: 1981 Method for standard penetration test for soils [2]) value, which is further validated as per a similar international study undertaken by Caltrans Geotechnical Manual (Caltrans geotechnical manual of foundation reports for bridge (2021) [13]), 2021. Liquefaction analysis was also performed in areas with shallow water tables, identifying susceptibility in Jhajjar and Rohtak districts. Ground improvement methods, such as compaction at the locations where liquefiable depth is up to 4 m, and pile foundations for other locations, were recommended to mitigate liquefaction risks. For settlement analysis, RDSO guidelines allow post-construction settlement up to 25 mm, and BIS permits total settlement of 75 mm. As the strata are mostly cohesionless and most of the settlement will take place due to dead weight during construction itself, judicially, the permissible total settlement was considered 50 mm in the project so as to constrain post-construction settlement within 25 mm. This resulted in a saving of construction material and foundation cost of around 50%.

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A Case Study on Geotechnical Investigations for Haryana Orbital Rail Corridor (HORC) from Palwal to Harsana Kalan

  • Champakali Das,
  • Nehal Jain,
  • Bibek Kumar Jha,
  • Rajesh Agarwal

摘要

The case study of a comprehensive geotechnical investigation (IS 1892: 1979) Code of practice for subsurface investigation for foundations [1]) evaluates the suitability of the sub-soil strata for laying the foundation of various structures along the HORC project, spanning 140 km from Palwal to Harsanakalan in Haryana. Analysis of test results revealed a mix of fine and coarse-grained soil with predominantly cohesionless soil layers along the alignment, as illustrated in the detailed lithological profile. A correlation between field and laboratory parameters was established to derive soil design parameters and determine the SBC. A chart developed from these correlations to estimate the variation in angle of internal friction and bulk unit weight at different depths corresponding to SPT-N (IS 2131: 1981 Method for standard penetration test for soils [2]) value, which is further validated as per a similar international study undertaken by Caltrans Geotechnical Manual (Caltrans geotechnical manual of foundation reports for bridge (2021) [13]), 2021. Liquefaction analysis was also performed in areas with shallow water tables, identifying susceptibility in Jhajjar and Rohtak districts. Ground improvement methods, such as compaction at the locations where liquefiable depth is up to 4 m, and pile foundations for other locations, were recommended to mitigate liquefaction risks. For settlement analysis, RDSO guidelines allow post-construction settlement up to 25 mm, and BIS permits total settlement of 75 mm. As the strata are mostly cohesionless and most of the settlement will take place due to dead weight during construction itself, judicially, the permissible total settlement was considered 50 mm in the project so as to constrain post-construction settlement within 25 mm. This resulted in a saving of construction material and foundation cost of around 50%.