Abstract
To ensure the stability of floor structure and security for mining during extracting process of residual ores, it is essential to study the impact of caving ores to the floor. For this, the theory of rock micro-mechanics in combination with use of particle flow software PFC2D were applied to probe mechanical characteristics of stope floor under the impact from ore-rock bulk and dynamical response law of floor structure. The results show that the after the floor impacted by the caved ore-rock, shear cracks mainly located in the upper floor area and tensile cracks in the lower area and the joint zone of floor and surrounding rocks in which the tensile cracks tend to extend to both sides of surrounding rock.
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