【摘要】 为了研究低均质度对岩石冲击倾向性的影响,用RFPA2D软件模拟了多尺度下岩石变形破坏的全应力-应变曲线,借用峰值载荷对应加载步数、载荷、声发射累计计数、声发射累计能量的离散系数衡量尺寸效应对岩石试件破坏结果参数的随机性影响,确定50mm×100mm的试件随机性影响最小。基于此尺寸下模拟了不同均质度对岩石冲击倾向性及强度的影响,结果表明:低均质度下,均质度与岩石破坏极限峰值强度成正比;在均质度小于2时,冲击倾向性指标判定为无冲击倾向性或弱冲击倾向性;当均质度大于等于2时,岩石表现出强冲击倾向性;随着均质度的增大,岩石的破坏形式由延性破坏逐渐转化为脆性破坏。更多还原

【Abstract】 In order to study the influence of low homogeneity on the rock outburst proneness,the full stress-strain curve of rock multi-scale deformation and failure was simulated by RFPA2 D.The discrete coefficients of the peak load corresponding to the numbers of loading steps,the load,the AE cumulative count and the AE cumulative energy were used to describe the randomness influence of size effects on the rock failure parameters.It showed that the randomness influence of the specimen with 50 mm×100 mm was the least.Then the influence of different homogeneities on rock outburst proneness and strength were simulated based on this size.The results showed that under low homogeneity,the homogeneity was proportional to the peak intensity of rock failure limit.When the homogeneity was less than 2,the outburst proneness index was determined to be no outburst proneness or weak outburst proneness.When the homogeneity was greater than or equal to 2,the rock exhibited strong outburst proneness.With the increase of homogeneity,the failure mode of rock gradually transformed from ductile failure to brittle failure.更多还原