Armchair Geotech – Possible Hydro-Collapse at School Site?

Raghu on the Geotechnical Engineers Linkedin Group has a problem.  A new school site (location not disclosed) was built with cut and fill methods at a location where the winter ground water table is only 0.5 m below grade.  The soil conditions are glacial tills with sands and gravels and bands of clay.  During the last 2 winters since the school was constructed, water has ponded around the school grounds.  There is some kind of subsidence feature occurring close to the building, and Ragu wonders if this is a hydro-induced collapse feature.  Fortunately, the building shows no signs of movement yet.  He is wondering what can be done at this stage.  Care to weigh in?

Source: I RECKON THE 5M DEEP EXCAVATION BELOW THE WATER TABLE CAUSED THE PROBLEM. IS THERE A SOLUTION AT THIS STAGE? – GEOTECHNICAL EXPERT COMMENTS SOLICITED

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