The Problem And Processed Measure Of Geotechnical Engineering Of Goaf

To study and research the goaf to cause the deformation of ground, influencing factor,stability of goaf and to decide the extent of effect for the project and to provide the processed measure, it based on the goaf of coal mine of liudaowan that the northeast road which out ring the city about urumqi to pass through. To sum up the literatures to get mains influencing factors of ground deformation of goaf and to combine together with actuality condition to analyze the effect level about of influencing factors.The influencing factors such as stratum texture of rock ,geological structure,earthquake action,mechanics character of rock,way of mine and office procedure of roof, thickness and width of mine, deepness of goaf to bury and so on. Analysis the type, characteristic, space-time and continuity for ground deformation to get the main type of deformation are sttlement, ground to sink and fracture.The sttlement of goaf was happened on top of goaf,it is asymmetry and more difference for two sides. The sttlement of goaf have space-time and continuity.Use preferred index such as burial preferred index DR=1,time preferred index TR=1,gob handling preferred index PR=0.9,disturbed geotechnical body preferred index MR=0.5-0.95,the result to make clear that the ground deformation preferred is strong. To divide three parts from roof and floor, established the model of mechanics to detrude the formula about the force from tow side of the rock strip be nonactive condition,and detrude the formula of slidable safety factor.The result is that the legionary rock strip in 1 and 2 part are dumping,the safety factor of 3 part fs=0.27<1,the roof and floor of goaf are instability.According to the nonactive boundary and deformed boundary make an analysis about the effect of the project on the goaf,the result is that the K1+360m—K2+290m of the project was be influenced with ground deformation of goaf,and the size of influencing limit is 1.01km~2.According to the actual condition,the final choose is the fill method,use this method to manage the goaf.For the miniative pit,must be filled close-grained;The uncompacted and goaf deep buried below 30m use serosity to fill it.