Baiyun District, Guangzhou, exists a large number of abandoned coal districts and covered karst areas. With the rapid development of urban construction, especially the underground construction, the original geological environment was seriously disturbed, and the surface collapse has become one major geological hazard, so it’s important to evaluate and predict the risk of collapse .The author has researched from two parts in the dissertation:1. The prediction and evaluation about the Mining collapseThere are two coal districts including four coal mines, Jiahe no2, no3, no4 Mine and Dalang Mine. All of the abandoned mines had been closed before 1997, and suffered the mining collapse hazard.The paper has analyzed the cavern stability by the collapse balance method and the M.M. Promojiyfakonkv arch Theory. The result showed the abandoned coal districts were only instability above -150m.Besides, the mine discharge was another disaster in the mine-out area. The paper zoned the risk by analysis the discharge environment elements.2. The prediction and evaluation about the karst collapseBaiyun district distributed of Carboniferous and Permian carbonate, and the human activity is another main element of karst collapse. By learning from the main elements of the karst collapse, it’s evaluated by Analytic Hierarchy Process.In summary, the high risk area are 6.8 km2, accounting for about 13.7percent, for example, Dagang, Xiaomao and so on; the medium risk area are 43.5 percent. It’s should be avoided the high risk area as far as possible or taken some engineering measures, such as grouting. For projects designed should enhance the integrity of buildings and shorten the processing slot.
Surface Collapse Hazard Assessment and Prediction in Guangzhou Baiyun Area
Posted by GIS PARK on January 5th, 2012 |
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