Based on analyzing a great deal of investigation datum and practical observation,crack genetic analysis and predictability in mountainous excavate coal areas were contrasted with an example by anticipate surface movement system,the relations between mining cracks and surface movement deformation was discussed,and the surface cracks for the concrete working face were also forecast.

It is a highly serious problem of geotechnical engineering that underground mining arouse terrane movement and ground subsidence, which, at the same time, causes a great deal of ground fissure from coal mining.

The characteristics and its influence to the structure function of the bridge crack are analyzed,the grouting material and technology of bridge active crack are studied to according to its characteristics,and carried on the spot to experiment to the some engineering,the experiment results showed that project of dealing with the bridge active crack is available.

In the subsidiary dam construction of XIAO LANG-DI water conservancy engineering, many lifting cracks in the concrete cover board appeared.

Method of measuring dynamic cracks on concrete structures;