Sinkage control of North-West corner of Kolkata high court by consolidation grouting and stabilization using Drucstone c
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(2020) 5:27
RESEARCH ARTICLE
Sinkage control of North‑West corner of Kolkata high court by consolidation grouting and stabilization using Drucstone chemical grout: A case study Tushar Gupta1 Received: 1 February 2020 / Accepted: 13 August 2020 © Springer Nature Switzerland AG 2020
Abstract The North-West corner of the Kolkata high court started developing cracks and showing signs of differential subsidence due to unstable soil conditions below its foundation. Investigations indicated that the brick foundation of the high court rested on backfilled material and low strength soil, which had now developed greater instability due to possible soil liquefaction as a result of the proximity of Hooghly River. Based on the damage monitoring of the structure, a two-phase grouting operation was executed at the N-W corner of the building which involved consolidation grouting below and surrounding the brick foundation, and curtain grouting around the corner periphery. The grouting operation was performed using Drucstone chemical grout, which is a two-component low-foaming polyurethane-based chemical, capable of substantially improving the properties of the deteriorated soil mass. This stopped the sinkage of the building completely, which was confirmed by deformation monitors installed throughout the N-W corner of the building. The settlement of the N-W corner was arrested at 19.48 mm depth, while the rate of settlement, which was initially 0.25 mm/day, was finally reduced to 0.015 mm/day and gradually arrested. This project also proved the effectiveness of Drucstone in such scenarios by showcasing its efficient soil improvement and consolidation properties indicated by an increase in soil cohesion by 90% and its shear modulus by 300%. Keywords Kolkata high court · Consolidation grouting · Curtain grouting · Chemical grouting · Drucstone
1 Introduction The Kolkata high court is one of the oldest high courts in India. The monumental building was completed in 1872 and was loosely based on the thirteenth century Cloth Hall at Ypres, Belgium [1]. Located merely 130 m from the Hooghly River and within 500 m from Raj Bhavan and Eden Gardens, the high court serves as the main center of justice for the state of West Bengal and the Andaman and Nicobar Islands in India (Fig. 1). Kolkata high court has a rectangular design with the main entrance located at its southern long edge through the central tower. There are twelve sets of columns on both sides of the main gate, which are a group of four pillars each. The three floors contain a group of rooms throughout their wings
* Tushar Gupta [email protected] 1
Geo Constech Private Limited, New Delhi 110065, India
including the courtrooms, prisoner’s rooms, Judges’ chambers, libraries, offices, and association rooms [2]. Being built in Neo-Gothic architecture, the prime construction materials used for the Kolkata high court were mortar and red bricks for the foundations and walls, sandstone and limestone for the stonework, while the finishing and decorations were performed
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