The 'chimney': the phenomenon that could explain the L9 sinkhole
From the article
48 hours after the sinkhole that L9 construction work opened in the Sant Gervasi - la Bonanova neighborhood, it remains unknown exactly what happened to suddenly cause the ground to open up. While fire department teams are inspecting each of the 93 affected apartments one by one to check for new movements, the causes of the incident that has forced at least eight blocks to be evacuated until Saturday are also being investigated. Among experts, there is also debate about how it could have happened. And they point to a main hypothesis: that, due to some incident, the tunnel boring machine may have generated what is known as a chimney .
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