岩样单轴压缩的尺度效应和矿柱支承性能

THE SIZE EFFECT OF UNIAXIAL COMPRESSION OF ROCKSPECIMEN AND SUPPORT CAPACITY OF ORE PILLAR

岩样应力峰值之后的变形是非均匀的，其强度降低与总的塑性变形量成正比，比例系数与岩样长度无关；讨论了岩样形状、尺度对峰后弱化过程的影响．从支承顶板载荷与沉降位移两个方面说明了大矿柱具有更好的性能。

The deformation of rock specimen is not homogeneous in the post peak area in uniaxial compression.The reduction of strength is in direct proportion with the total plastic deformation,and has nothing to do with the proportional coefficient and length of the rock specimen.The effect of shape and size of rock specimen on the weakening process in the post peak zone is discussed.In terms of supporting the load of roof and displacement the larger pillar has better performance and can prevent the rock burst.