| Karst collapse is one of the covered karst geologies at present. And it also is a kind of the disaster. With the development of country economy, all of the country explore the resource of covered karst stronger and stronger and which caused many karst collapses. According to incomplete statistic, there are sixteen countries who have serious problems about karst collapse.Karst collapse occurs suddenly and it has no evident symptom in advance. So it is difficult to forecast the karst collapse's time and place.On the other hand, we can evaluate the possibility of karst collapse by surveying the enigeering geology particularly. In other words, prevention and drawing building's layout decide by the stability of karst collapse.There's a large karst collapse in 2003 in yanglou Tai'an area ,Shandong Province and there is a big elipse karst delve on the point of the comfield. This delve has 35 meters length and 27 meters width and 24 meters depth, so it is the biggest karst collapse in Shandong Province at present. Tai'an city is one of the area in which karst collapse earlier occurred in China. For many years, as the rising of taking of underground water, the karst collapse has become more serious.This paper sums up present and history karst collapse in Tai'an, Shandong Province. It mainly spreads in the Quaternary system cover areas where the looser layers are thinner, underlying open karst caves and cracks are under the Quaternary system. The collapse mainly occurs in the low-water years or during the beginning of the dry season and rain season in a year. The formation and developing scales of the collapse are affected by many factors, such as karst caves, sola and water,etc. However, the taking of the underground water which causes the hydrodynamic conditions changed and the water level highly descended is a leading factor for the karst collapse.The mechanism of karst collapse is discussed based on long-term monitoring results of groundwater level and geological environment. At last...
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