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For important industrial projects, the criteria for qualifying the founding media are demanding; and often the properties obtained in the field fall short of the requirements. In such scenario, to meet the design requirements, ground improvement techniques become essential for upgrading the properties of the founding media. In this article we present a case study of ground improvement activities carried out recently for an industrial facility of national importance, enumerating the problems, and the adopted solutions. The facility required a safe bearing capacity of 100 T/m2; and a permeability less than 3 lugeons. After reaching the foundation strata, a detailed geological mapping was carried out. The litho-type at the foundation level was reported as fresh (W0 grade) to slightly weathered (W1 grade) vesicular amygdular basalt (VAB). There were a few areas of moderately weathered (W2 grade) VAB as well. The amygdule consisted of calcareous to siliceous materials varying from 20% to 40%. The exposed rock imparted a metallic sound on the hammer impact at certain locations. A total of twelve dykes of basaltic composition were found to have intruded into the host rock. The width of the dykes varied from 0.6 m for the thinnest dyke to 14 m for the widest one. All the dykes ran across the plot of excavation at various oblique angles. It was found that the dykes fell under Class IV (poor rock) with the RMR values ranging between 25 and 35. Marginal undercuts were also observed in the foundation area towards the northern margin at some locations. Different ground improvement techniques, and remediation measures, such as, cement grouting, dental treatment, removal and replacement—both small scale and large scale—were implemented to address all the issues concerning the bearing capacity, the permeability, and the differential settlement considerations. Post remediation, the geotechnical investigations carried out on the improved founding media confirmed the success of the remediation measures; and qualified the foundation strata for the target bearing capacity, and the target permeability.

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Increasing Bearing Capacity and Reducing Permeability of Founding Media: A Case Study of Ground Improvement

  • 会议论文

  • 发表日期：

    2025年

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  • S. Dauji,
  • P. K. Srivastava,
  • K. Bhargava,
  • R. K. Chauhan,
  • V. K. Singh

摘要

For important industrial projects, the criteria for qualifying the founding media are demanding; and often the properties obtained in the field fall short of the requirements. In such scenario, to meet the design requirements, ground improvement techniques become essential for upgrading the properties of the founding media. In this article we present a case study of ground improvement activities carried out recently for an industrial facility of national importance, enumerating the problems, and the adopted solutions. The facility required a safe bearing capacity of 100 T/m2; and a permeability less than 3 lugeons. After reaching the foundation strata, a detailed geological mapping was carried out. The litho-type at the foundation level was reported as fresh (W0 grade) to slightly weathered (W1 grade) vesicular amygdular basalt (VAB). There were a few areas of moderately weathered (W2 grade) VAB as well. The amygdule consisted of calcareous to siliceous materials varying from 20% to 40%. The exposed rock imparted a metallic sound on the hammer impact at certain locations. A total of twelve dykes of basaltic composition were found to have intruded into the host rock. The width of the dykes varied from 0.6 m for the thinnest dyke to 14 m for the widest one. All the dykes ran across the plot of excavation at various oblique angles. It was found that the dykes fell under Class IV (poor rock) with the RMR values ranging between 25 and 35. Marginal undercuts were also observed in the foundation area towards the northern margin at some locations. Different ground improvement techniques, and remediation measures, such as, cement grouting, dental treatment, removal and replacement—both small scale and large scale—were implemented to address all the issues concerning the bearing capacity, the permeability, and the differential settlement considerations. Post remediation, the geotechnical investigations carried out on the improved founding media confirmed the success of the remediation measures; and qualified the foundation strata for the target bearing capacity, and the target permeability.