Aiming at the problem of pillarless sublevel caving structural parameters of the third period mining area of Jinshandian Ore Mine

the possible structural parameters are simulated and analyzed by using sublevel caving simulation system –SLS which is developed by Northeastern University of China and the geotechnical engineer software-FLAC3D which is developed by ITASCA Inc. The numerical experiment indicates that independent advance of ore breaking influences the recovery index evidently

and the independent advance of ore breaking of 3.5－4.5 m has more advantage in recovery index. Also considering the rock blasting effect

the independent advance of ore breaking of 3.5 m is recommended. The numerical simulation of sequential excavation of tunnel groups in a mine block is also carried out. By analyzing the displacements

stresses and plastic zone of excavation simulation

it is concluded that the tunnel groups have satisfactory stability with the designed structural parameters. To sum up

sublevel height of 14 m

drift interval of 16 m

tunnel width of 3.6 m and tunnel height of 3.2 m are reasonable for both the recovery index and the surrounding rock stability.