关键词: 连续全面回采, 数值模拟, 采场, 应力, 塑性区

Abstract: In view of the continuous extraction by the overall mining，the stope stability is analyzed.Taking a copper mine in Yunnan for example，the stress，displacement and plastic zone are analyzed by the numerical simulation method.The results showed that：with the mining advanced，maximum and minimum principal stress did not appear at depth，but concentrated on the top and bottom pillars.The minimum value of minimum principal stress in the stope increased from 2.53 MPa to 5.71 MPa with a 125.7% increase，and the minimum value of maximum principal stress increased from 6.88 MPa to 20.11 MPa，with a 192.3% increase.These may lead to failure on stope.The displacement of each point all showed a growing trend.The displacement of three top and bottom pillars increased suddenly，and the maximum subsidence on the central pillar reached 47.87 mm.The top and bottom pillar showed as shear failure，and the plastic zone of surrounding rock was extended，showing as shear，tensile and shear-tensile failure.In order to ensure the stope safety，the size of top and bottom pillar should be enlarged properly，or stope size should be reduced.

Key words: Continuous extraction, Numerical Simulation Method, Stope, Stress, Plastic zone