The Central University of Tamil Nadu (CUTN), Thiruvarur constructed 30 numbers of Staff Quarters with load bearing wall in 2013. During the end of 2016, considerable vertical, horizontal and diagonal cracks of 5 to 10 mm wide were noticed, in one building, on the exterior walls of living room and also caving-in of floor tiles and plinth protection slabs to a depth of 50 to 100 mm. The type of foundation was strip footing of 2 m width placed at 2 m depth (Footing pressure is 68.98 kN/m2). Bore log data revealed that the top 4 m soil below the footing is dominantly expansive clay of N-value 4 to 7 underlain by sandy layer of N-value 4 to 7. The consolidation settlement of 142 mm and swell pressure of 410 kN/m2 were computed for the soil below the footing. Hence, it was evident that excess settlement and swell pressure due to untreated expansive soil are the primary causes of distress in building. To remediate distress, it was recommended to stabilize the foundation soil by lime injection in the entire footing area of building. In the severely affected area, under reamed piles with single bulb was recommended up to a depth of 3.6 m.

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Remedial Measures to Rectify the Distress in the Staff Quarters of CUTN, Thiruvarur, Tamil Nadu—Case Study

  • M. Muttharam,
  • V. K. Stalin

摘要

The Central University of Tamil Nadu (CUTN), Thiruvarur constructed 30 numbers of Staff Quarters with load bearing wall in 2013. During the end of 2016, considerable vertical, horizontal and diagonal cracks of 5 to 10 mm wide were noticed, in one building, on the exterior walls of living room and also caving-in of floor tiles and plinth protection slabs to a depth of 50 to 100 mm. The type of foundation was strip footing of 2 m width placed at 2 m depth (Footing pressure is 68.98 kN/m2). Bore log data revealed that the top 4 m soil below the footing is dominantly expansive clay of N-value 4 to 7 underlain by sandy layer of N-value 4 to 7. The consolidation settlement of 142 mm and swell pressure of 410 kN/m2 were computed for the soil below the footing. Hence, it was evident that excess settlement and swell pressure due to untreated expansive soil are the primary causes of distress in building. To remediate distress, it was recommended to stabilize the foundation soil by lime injection in the entire footing area of building. In the severely affected area, under reamed piles with single bulb was recommended up to a depth of 3.6 m.