裂隙倾角对岩体能量演化规律影响研究
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摘要
准确预测岩体失稳破坏可为岩体支护设计提供依据。通过单轴循环加卸荷试验探究裂隙倾角在岩体各受荷过程中对能量演化规律的影响,揭示岩体变形破坏过程中能量演化的本质特征。研究表明:加荷初期,弹性能比例为40%～45%,中期为55%左右,临近破坏时为60%～65%,能量比例变化速率和裂隙倾角关系密切。能量密度随荷载增加而增加,裂隙倾角影响能量密度的变化速度;能量密度比例趋势转折越明显,表明岩体越易破坏;耗散能密度增减过程与岩石受荷起裂破坏过程拟合程度较高;裂隙岩体对能量的吸收能力随裂隙倾角的增长先增加后减小。裂隙倾角对能量演化的影响呈非线性,不同受荷阶段的能量关系存在显著特征,此特征能够较好预警岩体失稳破坏。
Prediction of instability and failure of rock mass can provide a basis for the design of rock mass support. The effect of fissure inclination on the energy evolution of rock mass is studied by cyclic loading and unloading. The process of energy evolution revealed the nature of rock deformation and breakage. The study results show that: the elastic energy ratio is about 40% ～45% at the beginning of the loading,approximately 55% at the middle stage,and 60% ～ 65% at the later stage; The variation rate of elastic energy ratio has a close relation with the fissure inclination. The energy density increases with the increase of load,and the fissure inclination affects the variation rate of energy density; The more obvious the transition of the ratio of energy density is,the closer the rock mass is to destruction; The increase and decrease of dissipation energy density has a high correlation with the failure process of rock mass; The energy absorption capacity of fractured rock mass increases first and then decreases with the increase of inclination,showing a nonlinear relationship between the fracture angle and the energy evolution. These relations are distinguished in different stages,thus it can be an early indicator to instability and failure of rock mass.
Prediction of instability and failure of rock mass can provide a basis for the design of rock mass support. The effect of fissure inclination on the energy evolution of rock mass is studied by cyclic loading and unloading. The process of energy evolution revealed the nature of rock deformation and breakage. The study results show that: the elastic energy ratio is about 40% ～45% at the beginning of the loading,approximately 55% at the middle stage,and 60% ～ 65% at the later stage; The variation rate of elastic energy ratio has a close relation with the fissure inclination. The energy density increases with the increase of load,and the fissure inclination affects the variation rate of energy density; The more obvious the transition of the ratio of energy density is,the closer the rock mass is to destruction; The increase and decrease of dissipation energy density has a high correlation with the failure process of rock mass; The energy absorption capacity of fractured rock mass increases first and then decreases with the increase of inclination,showing a nonlinear relationship between the fracture angle and the energy evolution. These relations are distinguished in different stages,thus it can be an early indicator to instability and failure of rock mass.
引文
[1]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):3003-3010.
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[3]张志镇,高峰.受载岩石能量演化的围压效应研究[J].岩石力学与工程学报,2015,34(1):2-11.
[4]张志镇,高峰.单轴压缩下红砂岩能量演化试验研究[J].岩石力学与工程学报,2012,31(5):953-962.
[5]白仕红.循环荷载下裂隙岩体能量演化及损伤特性[D].成都:成都理工大学,2015.
[6]薛东杰,周宏伟,钟江城,等.采动岩体能量释放及灾变机制研究[J].岩石力学与工程学报,2014,33(S2):3865-3872.
[7]周洪飞,苏国韶.岩石破裂与能量释放过程的FLAC3D数值模拟[J].人民长江,2012,43(17):74-78.
[8]苏承东,张振华.大理岩三轴压缩的塑性变形与能量特征分析[J].岩石力学与工程学报,2008,27(2):273–280.
[9]尤明庆,华安增.岩石试件破坏过程的能量分析[J].岩石力学与工程学报,2002,21(6):778–781.
[10]许江,张媛,杨红伟,等.循环孔隙水压力作用下砂岩变形损伤的能量演化规律[J].岩石力学与工程学报,2011,30(1):141–148.
[11]喻勇,张宗贤,俞洁,等.岩石直接拉伸破坏中的能量耗散及损伤特征[J].岩石力学与工程学报,1998,17(4):386–392.
[12]华安增,孔园波,李世平,等.岩块降压破碎的能量分析[J].煤炭学报,1995,20(4):389–392.
[13]黄达,黄润秋.卸荷条件下裂隙岩体变形破坏及裂纹扩展演化的物理模型试验[J].岩石力学与工程学报,2010,29(3):502-512.
[14]徐建光,张平,李宁.循环荷载下断续裂隙岩体的变形特征[J].岩土工程学报,2008,30(6):802–806.
[15]哈秋舲.加载岩体力学与卸荷岩体力学[J].岩土工程学报,1998,20(1):114-118.
[16]赵东宁,李明霞,张艳霞,等.微裂隙对灰质泥岩强度的影响分析[J].人民长江,2013,44(22):86-88.
[17]肖树芳,杨淑碧.岩体力学[M].北京:地质出版社,1987.
[18]韩刚,杨帆,刘宇,等.双轴循环荷载条件下含预制裂纹类玄武岩岩桥贯通模式[J].工程地质学报,2016,24(2),235-245.
[19] SUN J,WANG S J.Rock mechanics and rock engineering in China:developments and current state-of-the-art[J]. International Journal of Rock Mechanics and Mining Sciences,2000,37(3):447–465.
[2]张志镇.岩石变形破坏过程中的能量演化机制[D].徐州:中国矿业大学,2013.
[3]张志镇,高峰.受载岩石能量演化的围压效应研究[J].岩石力学与工程学报,2015,34(1):2-11.
[4]张志镇,高峰.单轴压缩下红砂岩能量演化试验研究[J].岩石力学与工程学报,2012,31(5):953-962.
[5]白仕红.循环荷载下裂隙岩体能量演化及损伤特性[D].成都:成都理工大学,2015.
[6]薛东杰,周宏伟,钟江城,等.采动岩体能量释放及灾变机制研究[J].岩石力学与工程学报,2014,33(S2):3865-3872.
[7]周洪飞,苏国韶.岩石破裂与能量释放过程的FLAC3D数值模拟[J].人民长江,2012,43(17):74-78.
[8]苏承东,张振华.大理岩三轴压缩的塑性变形与能量特征分析[J].岩石力学与工程学报,2008,27(2):273–280.
[9]尤明庆,华安增.岩石试件破坏过程的能量分析[J].岩石力学与工程学报,2002,21(6):778–781.
[10]许江,张媛,杨红伟,等.循环孔隙水压力作用下砂岩变形损伤的能量演化规律[J].岩石力学与工程学报,2011,30(1):141–148.
[11]喻勇,张宗贤,俞洁,等.岩石直接拉伸破坏中的能量耗散及损伤特征[J].岩石力学与工程学报,1998,17(4):386–392.
[12]华安增,孔园波,李世平,等.岩块降压破碎的能量分析[J].煤炭学报,1995,20(4):389–392.
[13]黄达,黄润秋.卸荷条件下裂隙岩体变形破坏及裂纹扩展演化的物理模型试验[J].岩石力学与工程学报,2010,29(3):502-512.
[14]徐建光,张平,李宁.循环荷载下断续裂隙岩体的变形特征[J].岩土工程学报,2008,30(6):802–806.
[15]哈秋舲.加载岩体力学与卸荷岩体力学[J].岩土工程学报,1998,20(1):114-118.
[16]赵东宁,李明霞,张艳霞,等.微裂隙对灰质泥岩强度的影响分析[J].人民长江,2013,44(22):86-88.
[17]肖树芳,杨淑碧.岩体力学[M].北京:地质出版社,1987.
[18]韩刚,杨帆,刘宇,等.双轴循环荷载条件下含预制裂纹类玄武岩岩桥贯通模式[J].工程地质学报,2016,24(2),235-245.
[19] SUN J,WANG S J.Rock mechanics and rock engineering in China:developments and current state-of-the-art[J]. International Journal of Rock Mechanics and Mining Sciences,2000,37(3):447–465.