Recent investigations into sinking of the 20th pillar in the 7th block of Medigadda Barrage, part of the Kaleshwaram project, have shed light on the root cause of the sinking. The investigation revealed that piping is the major reason for the sinking.
Faults detected at two locations in the secant piles of the pillar facilitated the ongoing water flow, resulting in the erosion of sand at the pillar’s base.
Construction agency L&T has spearheaded the inquiry, employing Electro Resistivity Tomography (ERT) and Ground Penetrating Radar (GPR) tests to assess underground conditions. These tests, completed in the 7th block, identified the complete displacement of sand beneath the pillar as the root cause of the collapse.
Despite this, the agency’s report has yet to reach the government, raising concerns over negligence in addressing critical infrastructure issues. ERT and GPR tests have revealed that defective secant piles allowed water to persist beneath the foundation, washing away soil and creating a void that led to the pillar’s failure.
Experts emphasize the need for comprehensive testing of the 7th block’s foundation to rectify internal water flow issues and prevent future collapses. Accurate identification of water piping origins and pathways is crucial for implementing corrective measures and safeguarding the integrity of the barrage’s foundation.