第13章 地基岩(土)体工程地质100812

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1、 Mud flow north of Dubois, WY and west of Little Horse Creek. Sediment derived from Tertiary sediments exposed in middle distance. SinkholesSinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by ground water cir

2、culating through them. As the rock dissolves, spaces and caverns develop underground. Sinkholes are dramatic because the land usually stays intact for a while until the underground spaces just get too big. If there is not enough support for the land above the spaces then a sudden collapse of the lan

3、d surface can occur. These collapses can be small, as this picture shows, or they can be huge and can occur where a house or road is on top. The most damage from sinkholes tends to occur in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania. The picture to the left shows a sink

4、hole that quickly opened up in Florida, apparently eating a swimming pool, some roadway, and buildings. The famous Holbeck Hall Hotel, in Scarborough which slipped into the sea in 1993.This is a view of the Steady Hole Fall which occured in the Folkestone Warren area in 1915. This photograph was tak