Sinkhole geohazards

Abstract

Sinkhole geohazards collapse. Sinkholes can be just a metre across, or more than 100 m wide and deep. They come in various forms, which can be grouped into about six main types (Fig. 2). Solution and collapse sinkholes are formed in solid rock, with the solution sinkhole forming so slowly (over geological timescales) that it is a land-form and not a geohazard, and the caprock sinkhole is just a collapse where a void in the limestone has undermined a cover rock. Far more common are the two types of subsidence sinkhole that are formed entirely in the soil cover; soil fails a lot more easily than rock. The buried sinkhole may not have much to show, but can be a major inconvenience for a construction engineer trying to place foundations on