低弹模包体强度对试样破裂模式影响的数值试验
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摘要
应用自行开发的岩石破裂与失稳RFPA2D系统 ,对含低弹模不同强度的包体试样的破裂模式进行了数值试验 .结果表明 :随着包体强度的增大 ,包体声发射总次数呈明显的下降趋势 ,而包体主破裂位移加载量呈上升趋势 ,试样最大承载力呈上升趋势 ;包体水平轴线上各单元点的剪应力降总是先发生在包体两端位置处 ,当包体强度较小时 ,剪应力降由包体水平轴线中央向其两端扩展 ,当包体强度较大时 ,由包体水平轴线两端向其中央扩展
Fracture model of samples with inclusion of low elastic modulus and different strength under the iso-speed displacement load are simulated by using our RFPA 2D code.The results show that with the increase of the inclusion strength,its acoustic emission(AE) total count has a decreasing trend,while its main fracture displacement load and maximal carrying capacity has an increased trend;when the inclusion strength is comparatively low,sheer stress within inclusion horizontal axes decline from center to its two sides,while when inclusion strength is comparatively high,the result is the other way,though the original shear stress decline is always at its boundary.
Fracture model of samples with inclusion of low elastic modulus and different strength under the iso-speed displacement load are simulated by using our RFPA 2D code.The results show that with the increase of the inclusion strength,its acoustic emission(AE) total count has a decreasing trend,while its main fracture displacement load and maximal carrying capacity has an increased trend;when the inclusion strength is comparatively low,sheer stress within inclusion horizontal axes decline from center to its two sides,while when inclusion strength is comparatively high,the result is the other way,though the original shear stress decline is always at its boundary.
引文
[1] BradyBT .Theoryofearthquakes(part1):Ascaleindependenttheoryofrockfailure[J].PureApplGeophys,1974,112:701-725.
[2] BradyBT .Theoryofearthquakes( part2):Inclusiontheoryofcrustalearthquakes[J].PureApplGeophys,1975,113(1/2):149-168.
[3] BradyBT .Theoryofearthquakes( part4):Generalimplicationsforearthquakeprediction[J].PureApplGeophys,1976,114:1031-1059.
[4] RiceJR .Thetheoryofprecursoryprocessionintheinceptionofearthquakerupture[J].GerlandsBeitrGeophysik,1979,88(2):91-127.
[5] 陈 .地壳岩石的力学性能———理论基础与实验方法[M ].北京:地震出版社,1998.
[6] 梅世蓉.地震前兆物理模式与前兆时空分布机制研究(一)———坚固体孕震模式的由来与证据[J].地震学报,1995,17(3):273-282.
[7] 许昭永,王 彬,赵晋明,等.含硬包体试样破裂特征的实验研究[J].地震学报,1997,19(1):79-85.
[8] HUYi-li,XUZhao-yong,WANGBin,etal.Thevariationstressfieldonfreeplaneofthesamplecontaininghardinclusioninprocessoffracturedevelopment[J].Earthquake,1997,17(2):162-168.
[9] 许昭永,胡毅力,赵晋明,等.含硬包体试样微破裂图象演变过程的实验研究[J].地震学报,1997,19(3):317-322.
[10] 张 智,吴开统.地震断层面上障碍体的实验研究[J].地球物理学报,1989,32(1):204-209.
[11] 唐春安,傅宇方.震源孕育模式的数值模拟研究[J].地震学报,1997,19(4):337-346.
[12] 唐春安.岩石破裂过程数值模拟方法发展的若干问题[A].世纪之交软岩工程技术现状与展望[C].北京:煤炭工业出版社,1999.10-17.
[2] BradyBT .Theoryofearthquakes( part2):Inclusiontheoryofcrustalearthquakes[J].PureApplGeophys,1975,113(1/2):149-168.
[3] BradyBT .Theoryofearthquakes( part4):Generalimplicationsforearthquakeprediction[J].PureApplGeophys,1976,114:1031-1059.
[4] RiceJR .Thetheoryofprecursoryprocessionintheinceptionofearthquakerupture[J].GerlandsBeitrGeophysik,1979,88(2):91-127.
[5] 陈 .地壳岩石的力学性能———理论基础与实验方法[M ].北京:地震出版社,1998.
[6] 梅世蓉.地震前兆物理模式与前兆时空分布机制研究(一)———坚固体孕震模式的由来与证据[J].地震学报,1995,17(3):273-282.
[7] 许昭永,王 彬,赵晋明,等.含硬包体试样破裂特征的实验研究[J].地震学报,1997,19(1):79-85.
[8] HUYi-li,XUZhao-yong,WANGBin,etal.Thevariationstressfieldonfreeplaneofthesamplecontaininghardinclusioninprocessoffracturedevelopment[J].Earthquake,1997,17(2):162-168.
[9] 许昭永,胡毅力,赵晋明,等.含硬包体试样微破裂图象演变过程的实验研究[J].地震学报,1997,19(3):317-322.
[10] 张 智,吴开统.地震断层面上障碍体的实验研究[J].地球物理学报,1989,32(1):204-209.
[11] 唐春安,傅宇方.震源孕育模式的数值模拟研究[J].地震学报,1997,19(4):337-346.
[12] 唐春安.岩石破裂过程数值模拟方法发展的若干问题[A].世纪之交软岩工程技术现状与展望[C].北京:煤炭工业出版社,1999.10-17.
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