岩体动力失稳及能量释放特征分析
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摘要
基于岩体动力失稳现象,建立了两体系统的力学模型。分析了两体系统失稳发生的条件和过程,并给出了岩体动力失稳的临界条件,确定了岩体动力失稳的弹性能释放终止点位置。给出的弹性能释放量图解中蕴涵了丰富的信息量,该图解与Ⅰ体荷载-形变曲线一起,使对岩体动力失稳弹性能释放特征描述图像化。研究表明Ⅰ体曲线指数m值和Ⅱ体的刚度kn值是影响岩体动力失稳弹性能释放量的2个重要因素,m值增大和kn减小都将导致弹性能释放量的增加。
Based on the rock dynamic destabilizing phenomena,the mechanical model of two rocks system was established.The destabilizing condition and process of two rocks system were analyzed,and rock dynamic destabilizing critical condition was given to strictly confirm the end of rock dynamic destabilization.The elastic energy release illustration in paper contains high amounts of information.Together with load-displacement of bodyⅠ,the elastic energy releasing characteristics of rock dynamic destabilization was described by image.The result showed that: bodyⅠcurve index m and body Ⅱ stiffness kn are two important factors which impact the elastic energy release of rock dynamic destabilization,and either m increases or kn decreases can lead to the increase of elastic energy release.
Based on the rock dynamic destabilizing phenomena,the mechanical model of two rocks system was established.The destabilizing condition and process of two rocks system were analyzed,and rock dynamic destabilizing critical condition was given to strictly confirm the end of rock dynamic destabilization.The elastic energy release illustration in paper contains high amounts of information.Together with load-displacement of bodyⅠ,the elastic energy releasing characteristics of rock dynamic destabilization was described by image.The result showed that: bodyⅠcurve index m and body Ⅱ stiffness kn are two important factors which impact the elastic energy release of rock dynamic destabilization,and either m increases or kn decreases can lead to the increase of elastic energy release.
引文
[1]林鹏,唐春安.二岩体系统破坏全过程的数值模物和实验研究[J].地震,1999,19(4):413-418.
[2]刘建新,唐春安,朱万成.煤岩串联组合模型及冲击地压机理研究[J].岩土工程学报,2004,26(2):276-280.
[3]谢和平,陈忠辉,周宏伟,等.基于工程体与地质体相互作用的两体力学模型初探[J].岩石力学与工程学报,2005,24(9):1457-1464.
[4]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.
[5]王志强,吴敏应,潘岳.斜坡失稳及其启程速度的折迭突变模[J].中国矿业大学学报,2009,38(2):175-181.
[6]潘岳,张勇,于广明.圆形硐室岩爆机制及其突变理论分析[J].应用数学和力学,2006,27(6):5741-5749.
[7]COOK N G W.The failure of rock[J].International Journal ofRock Mechanics&Mining Sciences,1965,2(3):389-403.
[2]刘建新,唐春安,朱万成.煤岩串联组合模型及冲击地压机理研究[J].岩土工程学报,2004,26(2):276-280.
[3]谢和平,陈忠辉,周宏伟,等.基于工程体与地质体相互作用的两体力学模型初探[J].岩石力学与工程学报,2005,24(9):1457-1464.
[4]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010.
[5]王志强,吴敏应,潘岳.斜坡失稳及其启程速度的折迭突变模[J].中国矿业大学学报,2009,38(2):175-181.
[6]潘岳,张勇,于广明.圆形硐室岩爆机制及其突变理论分析[J].应用数学和力学,2006,27(6):5741-5749.
[7]COOK N G W.The failure of rock[J].International Journal ofRock Mechanics&Mining Sciences,1965,2(3):389-403.
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