低均质度对岩石冲击倾向性的影响研究
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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。
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.
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.
引文
[1]谢和平，高峰，鞠杨，葛世荣，王国法，张茹，高明忠，吴刚，刘见中．深地煤炭资源流态化开采理论与技术构想[J]．煤炭学报，2017(3).
[2]谢和平，鞠杨，高明忠，高峰，刘见中，任怀伟，葛世荣．煤炭深部原位流态化开采的理论与技术体系[J]．煤炭学报，2018,43(5):1210-1219.
[3]李宏艳，康立军，徐子杰，齐庆新，赵善坤．不同冲击倾向煤体失稳破坏声发射先兆信息分析[J]．煤炭学报，2014,39(2):384-388.
[4]肖晓春，金晨，丁鑫，潘一山．基于声发射时频特征的不同含水煤样冲击倾向试验研究[J]．煤炭学报，2018,43(4):931-938.
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[9]苏海健，尹乾，靖洪文，赵洪辉．西部浅埋煤层煤样承载力及冲击倾向特征研究[J]．采矿与安全工程学报，2015,32(2):227-232+239.
[10]张志镇，高峰，刘治军．温度影响下花岗岩冲击倾向及其微细观机制研究[J]．岩石力学与工程学报，2010,29(8):1591-1602.
[11]石永奎，马源鸿，尹延春．尺寸效应对煤层冲击倾向性测试结果的影响[J]．煤炭科学技术，2014,42(2):23-26.
[12]蒋军军，邓志刚，欧阳振华，张宁博，王寅，张广辉．不同尺寸煤体失稳破坏的前兆声发射特征研究[J]．煤矿安全，2017,48(12):37-40+43.
[2]谢和平，鞠杨，高明忠，高峰，刘见中，任怀伟，葛世荣．煤炭深部原位流态化开采的理论与技术体系[J]．煤炭学报，2018,43(5):1210-1219.
[3]李宏艳，康立军，徐子杰，齐庆新，赵善坤．不同冲击倾向煤体失稳破坏声发射先兆信息分析[J]．煤炭学报，2014,39(2):384-388.
[4]肖晓春，金晨，丁鑫，潘一山．基于声发射时频特征的不同含水煤样冲击倾向试验研究[J]．煤炭学报，2018,43(4):931-938.
[5]肖福坤，侯志远，于涵．循环荷载下强冲击倾向煤样失稳的前兆信息分析[J]．黑龙江科技大学学报，2017,27(4):371-377.
[6]肖晓春，金晨，潘一山，丁鑫，赵鑫，徐军．组合煤岩破裂声发射特性和冲击倾向性试验研究[J]．中国安全科学学报，2016,26(4):102-107.
[7]巩思园，窦林名，何江，贺虎，陆菜平，牟宗龙．深部冲击倾向煤岩循环加卸载的纵波波速与应力关系试验研究[J]．岩土力学，2012,33(1):41-47.
[8]高峰，林斌，田智立．岩石冲击倾向与其波速变化的相关性研究[J]．岩石力学与工程学报，2012,31(S2):3527-3532.
[9]苏海健，尹乾，靖洪文，赵洪辉．西部浅埋煤层煤样承载力及冲击倾向特征研究[J]．采矿与安全工程学报，2015,32(2):227-232+239.
[10]张志镇，高峰，刘治军．温度影响下花岗岩冲击倾向及其微细观机制研究[J]．岩石力学与工程学报，2010,29(8):1591-1602.
[11]石永奎，马源鸿，尹延春．尺寸效应对煤层冲击倾向性测试结果的影响[J]．煤炭科学技术，2014,42(2):23-26.
[12]蒋军军，邓志刚，欧阳振华，张宁博，王寅，张广辉．不同尺寸煤体失稳破坏的前兆声发射特征研究[J]．煤矿安全，2017,48(12):37-40+43.