The ground beneath us is heating up, giving rise to the phenomenon of “underground climate change” and our civil infrastructure was not designed for it, scientists say. The continuous heat diffusion from buildings and underground transportation, seen in many urban areas around the world, causes the ground to warm at an alarming rate, found to be 0.1 to 2.5 degrees Celsius per decade by researchers.
The heating up of ground leads to its deformation that includes both expansion and contraction, causing building foundations and the surrounding ground to move excessively and sometimes develop cracks, thereby impacting structures’ long-term performance and durability. “The ground is deforming as a result of temperature variations, and no existing civil structure or infrastructure is designed to withstand these variations,” said Northwestern University’s Alessandro Rotta Loria, an assistant professor of civil and environmental engineering, and who led the US-based study published in the journal Communications Engineering.
Warmer temperatures caused swelling and expansion of the ground by as much as 12 millimetres and contraction and sinking (beneath the building’s weight) by as much as 8 mm, the researchers found using simulations on sensor-obtained temperature data of Chicago.