诱导冒落的声发射特性研究
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摘要
采用RFPA软件,模拟不同应力场、不同节理分布的岩体冒落过程中声发射特征.研究表明:水平节理顶板声发射集中分布于采场上拱角处;竖向节理顶板声发射沿着竖向损伤破坏面和剪切破坏面分布;共轭节理顶板声发射沿着空区与水平面呈45°+φ/2方向,位于节理端部;高应力岩体声发射沿着采场竖墙发生,声发射沿着冒落拱形迹线分布.冒落过程声发射的能量变化分为两个阶段,第一阶段为平稳阶段,第二阶段为突变阶段,结果表明突变阶段的能量变化率为第一阶段的5倍以上时,可作为顶板冒落的判据,为工程预测塌陷及冒落提供指导.
The acoustic emission(AE) characteristics during caving process of rock mass under different geo-stress field and joint distribution were simulated by using RFPA software.It demonstrates that the AE in horizontally jointed roof is concentrated in upper arch corner of stope,and the AE in vertically jointed roof is distributed along the vertical damage surface and shear failure surface.The AE in roof with conjugated joints locates at the joint end along the 45°+φ/2 direction between mined out area and horizontal plane.For the highly stressed rock mass,the AE is distributed along line of caving arch.The AE energy change during the caving process can be divided into two stages,i.e.the first stationary stage and the second catastrophic stage.This result manifests that the energy release rate during the catastrophic stage of AE release is above 5 times of the first stationary stage,which could provide guidance on engineering to predict collapse and caving.
The acoustic emission(AE) characteristics during caving process of rock mass under different geo-stress field and joint distribution were simulated by using RFPA software.It demonstrates that the AE in horizontally jointed roof is concentrated in upper arch corner of stope,and the AE in vertically jointed roof is distributed along the vertical damage surface and shear failure surface.The AE in roof with conjugated joints locates at the joint end along the 45°+φ/2 direction between mined out area and horizontal plane.For the highly stressed rock mass,the AE is distributed along line of caving arch.The AE energy change during the caving process can be divided into two stages,i.e.the first stationary stage and the second catastrophic stage.This result manifests that the energy release rate during the catastrophic stage of AE release is above 5 times of the first stationary stage,which could provide guidance on engineering to predict collapse and caving.
引文
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[3]李庶林,唐海燕.不同加载条件下岩石材料破裂过程的声发射特性研究[J].岩土工程学报,2010,32(1):147-151.(Li Shu－lin,Tang Ha－i yan.Acoustic emission characteristicsin failure process of rock under different uniaxial compressiveloads[J].Chinese Journal of Geotechnical Engineering,2010,32(1):147-151.)
[4]朱万成,唐春安,杨天鸿,等.岩石破裂过程分析(RFPA2D)系统的细观单元本构关系及验证[J].岩石力学与工程学报,2003,22(1):24-29.(Zhu Wan－cheng,Tang Chun－an,Yang Tian－hong,et al.Constitutive relationship of mesoscopic elements using inRFPA2D and its validations[J].Chinese Journal of RockMechanics and Engineering,2003,22(1):24-29.)
[5]梁正召,唐春安,黄明利,等.岩石破裂过程中声发射模式的数值模拟[J].东北大学学报:自然科学版,2002,23(10):1008-1010.(Liang Zheng－zhao,Tang Chun－an,Huang Ming－li,et al.Numerical simulation of patterns of acoustic emission in rockfailure process[J].Journal of Northeastern University:Natural Science,2002,23(10):1008-1010.)
[6]Tang C A.Numerical simulation on progressive failure leadingto collapse and associated aeismicity[J].International Journalof Rock Mechanics and Mining Science,1997,34(2):249-261.
[7]梁正召,唐春安,杨天鸿,等.含弱层岩石破裂前兆规律的数值模拟分析[J].地震,2003,23(3):65-70.(Liang Zheng－zhao,Tang Chun－an,Yang Tian－hong,et al.Numerical simulation of precursory phenomenon beforefracture of rocks containing incompetent layer[J].Earthquake,2003,23(3):65-70.)
[8]傅宇方,梁正召,唐春安.岩石介质细观非均匀性对宏观破裂过程的影响[J].岩土工程学,2000,22(6):705-710.(Fu Yu－fang,Liang Zheng－zhao,Tang Chun－an.Numericalsimulation on influence of mesoscopic heterogeneity onmacroscopic behavior of rock failure[J].Chinese Journal ofGeotechnical Engineering,2000,22(6):705-710.)
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