Study On Geological Hazard Of Karst Cave And Gob

Karst cave collapse means a kind of dynamic geological phenomenon, which refers to the overburden layer, deformed or destructed due to natural or artificial factors, and collapse to the crack of under layer, which formed a cave on the ground surface. Karst geological phenomenon usually lies in carbonate area, and widely existed in 22 provinces of China, this kind of geological hazard extremely threaten our industry of construction, mining and communication, and becomes one of the mainly geological hazard.Karst cave collapse can be divided as natural and artificial collapse, and which can also be divided to rock cave collapse and soil cave collapse from the point of geological material. This paper carefully analysis the methods of exploring karst cave collapse, give out the detail methods of classification and parameter selection, point out that there are three condition to form the collapse, give out the induced factors and mechanics, point out that usually the mainly factor is due to water, it also give the methods which deal with this kind of collapse, all of these were tested by several example. Finally, this paper simulates the procedure of karst cave collapse use UDEC, including the analysis of stress, strain, displacement and induced factors. This paper also simulate the procedure of karst cave collapse due to earthquake, and give the result of collapse zone, which is similar to the real result, and the error is 11.7%, which indicate that the simulation is reliable.From the above simulation, the discrete element method is good at analysis the procedure of karst cave collapse, and the result is agree well with the real situation, which give a good new method to compute and appraise the same kind of engineering.