New method for handling roof of emptied areas based successive mining is proposed

which is induction caving roof. The effect of induction caving roof is relative to the construct path

the mining method and the order of the induction caving. At the same time

the physical properties of mine and rock are nonlinear material properties (elastoplastic material). The system of induction caving roof is the nonlinear and the time-varying system

The FEM basic equations are built according to the theory of the time-varying mechanics. Then based the geology and the ore characteristic

the 2D FEM time-varying mechanical model is built in the testing stope of the Tongkeng Mine

the technology of the many steps is used to simulate the time-varying mechanical behavior

special the expanding of the plastic zone

the displacement and the safety factor in the tunnel to the two kinds mode of the induction caving roof. The effects are analyzed to the safety of the stope and the influences on the mine technology. The results show that it is advantage to induction caving roof

for which it is the technology the first pre-splitting blasting and the last forced caving. According to the results

it is proposed that the millisecond blasting between the first pre-splitting blasting bolts and the last bolts in the same time.