2018年6月9日 · Cover-subsidence sinkholes tend to develop gradually where the covering sediments are permeable and contain sand. In areas where cover material is thicker, or sediments contain more clay, cover-subsidence sinkholes are relatively uncommon, are smaller, and may go undetected for long periods.

2018年6月9日 · Cover-subsidence sinkholes tend to develop gradually where the covering sediments are permeable and contain sand. In areas where cover material is thicker or sediments contain more clay, cover-subsidence sinkholes are relatively uncommon, are smaller, and may go undetected for long periods.

Sinkholes are just one of many forms of ground collapse, or subsidence. Land subsidence is a gradual settling or sudden sinking of the Earth’s surface owing to subsurface movement of earth materials.

2015年10月15日 · Cover-subsidence sinkholes tend to develop gradually where the covering sediments are permeable and contain sand. In areas where cover material is thicker or sediments contain more clay, cover-subsidence sinkholes are relatively uncommon and therefore may not be seen frequently.

Cover-subsidence sinkholes These sinkholes start with something permeable covering the sinkhole while also containing a good deal of sand. This sediment begins to spill — or spall as the proper nomenclature refers to it — into those empty caverns among the bedrock.

2022年3月11日 · Cover-Subsidence Sinkholes. Covered submerged sinkholes tend to develop gradually where the overlying sediments are permeable and contain sand. In areas where the cover material is thicker or the sediments contain more clay, cover subsidence sinkholes are relatively rare, smaller and may go unnoticed for long periods of time.

Cover-subsidence sinkholes occur in areas where sand covers the bedrock. An example of such an area is an overburden composed of up to 100 feet of sand with some clay underneath before yielding to soft limestone.

The three major types of sinkholes known to us are Solution, Cover Collapse, and Cover Subsidence. 1. Solution Sinkhole. Solution sinkholes are most commonly seen in areas with a very thin soil cover on the surface, exposing the bedrock below to continual erosion by water.

• Most damaging sinkholes result from cover collapse. • In sandy sediment, the collapse process may be very rapid. • In dense, plastic clays the upward collapse may develop over years.

2015年10月26日 · Cover-subsidence sinkholes develop at depth, where the bedrock is overlain by permeable sediments that consist largely of sand. Surface drainage infiltrates through the overlying sediments and through joints or fractures in the bedrock.