[On-site Trouble Case] Cracking on the road surface and damage to the subgrade after pulling out a steel plate.

Cracks appeared on the embankment road surface immediately after pulling out the soil anchor! Introducing the causes and proposed countermeasures.

This is a case regarding a crack that occurred on the surface of a levee road immediately after the extraction of soil-retaining steel sheets in river construction adjacent to the levee road. When the steel sheets were pulled out at the end of the temporary period, viscous soil adhered to them and was lifted along with the sheets. As a result, a void of the size of the cross-section of the steel sheet type IV + α occurred within the ground. It is estimated that the surrounding ground moved into the void that formed within the ground, causing subsidence on the surface of the surrounding ground and resulting in cracks. 【Countermeasure Proposal】 ■ Apply a friction-reducing agent (friction cutter) to the temporary steel sheets in advance to prevent adhesion between the temporary steel sheets and the ground soil, thereby minimizing the ground voids that occur during the extraction of the steel sheets. *For more details, please download the PDF or feel free to contact us.

Piles, caissons, sheet pilesGround foundation construction method