基于SHPB的复合岩样动态力学特性数值模拟
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摘要
复合岩层的动态破坏问题在工程中越来越多,因此研究其动态破坏机理很有必要。采用PFC~(2D)软件建立分离式霍普金森压杆(SHPB)数值模型,模拟了复合岩层试样在不同倾角及不同应变率下的动态破坏过程。研究表明:随岩层倾角的增大,复合岩层试样动态抗压强度、动态弹性模量曲线整体呈先减小后增大的近"V"字型变化;动态抗压强度随着应变率的增加而增大,而动态弹性模量受应变率的影响较小;复合岩样裂纹以拉伸为主,随着应变率的增大,试样的动态破坏破碎程度越来越严重;试样的宏观破坏模式受细观裂纹的数量及贯通情况综合影响。研究结果有助于理解复合岩层动态破坏规律。
As the dynamic destruction of mixed rock strata are increasingly observed in engineering, it is indispensible to study the mechanism of dynamic destruction. A numerical model of split Hopkinson pressure bar(SHPB) was established by PFC~(2 D) to simulate the dynamic failure process of mixed rock strata specimens with different dip angles of rock strata at varied strain rates. The conclusions are drawn from numerical simulation as follows: 1) as the dip angle of mixed rock strata increased, the dynamic compressive strength and dynamic elastic modulus reduced at first and then surged, displaying a "V"-shaped curve; 2) dynamic compressive strength increased correspondingly with the climbing of strain rate, while dynamic elastic modulus is less affected by strain rate; 3) the cracks of mixed rock strata were dominantly tensile cracks, and dynamic fragmentation exacerbated with the increasing of strain rate; 4) the macroscopic failure mode of specimen was affected by the number and coalescence of cracks. The research findings are conducive to understanding the dynamic failure mechanism in mixed rock strata.
As the dynamic destruction of mixed rock strata are increasingly observed in engineering, it is indispensible to study the mechanism of dynamic destruction. A numerical model of split Hopkinson pressure bar(SHPB) was established by PFC~(2 D) to simulate the dynamic failure process of mixed rock strata specimens with different dip angles of rock strata at varied strain rates. The conclusions are drawn from numerical simulation as follows: 1) as the dip angle of mixed rock strata increased, the dynamic compressive strength and dynamic elastic modulus reduced at first and then surged, displaying a "V"-shaped curve; 2) dynamic compressive strength increased correspondingly with the climbing of strain rate, while dynamic elastic modulus is less affected by strain rate; 3) the cracks of mixed rock strata were dominantly tensile cracks, and dynamic fragmentation exacerbated with the increasing of strain rate; 4) the macroscopic failure mode of specimen was affected by the number and coalescence of cracks. The research findings are conducive to understanding the dynamic failure mechanism in mixed rock strata.
引文
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[5] 李超,刘红岩,阎锡东.动载下节理岩体破坏过程的数值试验研究[J].岩土力学,2015,36(2):655-664.
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[11] YAN Fei,FENG Xia-ting,CHEN Rong,et al.Dynamic Tensile Failure of the Rock Interface Between Tuff and Basalt[J].Rock Mechanics and Rock Engineering,2012,45(3):341-348.
[12] LI Xi-bing,ZOU Yang,ZHOU Zi-long.Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method[J].Rock Mechanics and Rock Engineering,2014,47(5):1693-1709.
[13] ZHU W C,BAI Y,LI X B.Numerical Simulation on Rock Failure under Combined Static and Dynamic Loading during SHPB Tests[J].International Journal of Impact Engineering,2012,49:142-157.
[14] XU Y,DAI F,XU N W,et al.Numerical Investigation of Dynamic Rock Fracture Toughness Determination Using a Semi-circular Bend Specimen in Split Hopkinson Pressure Bar Testing[J].Rock Mechanics and Rock Engineering,2016,49(3):731-745.
[15] 李晓峰,李海波,刘凯,等.冲击荷载作用下岩石动态力学特性及破裂特征研究[J].岩石力学与工程学报,2017,36(4):887-892.
[16] 殷鹏飞.层状复合岩石试样力学特性单轴压缩试验与颗粒流模拟研究[D].徐州:中国矿业大学,2016.
[17] TIEN Yong-ming,KUO Ming-chuan,JUANG Charng-hsein.An Experimental Investigation of the Failure Mechanism of Simulated Transversely Isotropic Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2006,43(8):1163-1181.
[18] 周子龙,李夕兵,岩小明.岩石SHPB测试中试样恒应变率变形的加载条件[J].岩石力学与工程学报,2009,28(12):2445-2452.
[2] 王礼立.爆炸与冲击载荷下结构和材料动态响应研究的新进展[J].爆炸与冲击,2001,21(2):81-88.
[3] 刘永胜,刘旺,董新玉.化学腐蚀作用下岩石的动态性能及本构模型研究[J].长江科学院院报,2015,32(5):72-75.
[4] 杨岳峰.基于模拟的岩石类材料在动载作用下的裂缝扩展研究[D].大连:大连理工大学,2012.
[5] 李超,刘红岩,阎锡东.动载下节理岩体破坏过程的数值试验研究[J].岩土力学,2015,36(2):655-664.
[6] 左宇军,唐春安,朱万成,等.动载荷作用下岩石破坏过程的数值试验研究[J].岩土力学,2008,29(4):887-892.
[7] 宫凤强.动静组合加载下岩石力学特性和动态强度准则试验研究[D].长沙:中南大学,2010.
[8] BERTHOLF L D,KARNES C.Two-dimensional Analysis of the Split Hopkinson Pressure Bar System[J] .Journal of the Mechanics and Physics of Solids,1975,23(1):1-19.
[9] ZHANG Q B,ZHAO J.Determination of Mechanical Properties and Full-field Strain Measurements of Rock Material under Dynamic Loads[J].International Journal of Rock Mechanics and Mining Sciences,2013,60:423-439.
[10] LIAO Z Y,ZHU J B,XIA K W,et al.Determination of Dynamic Compressive and Tensile Behavior of Rocks from Numerical Tests of Split Hopkinson Pressure and Tension Bars[J].Rock Mechanics and Rock Engineering,2016,49(10):3917-3934.
[11] YAN Fei,FENG Xia-ting,CHEN Rong,et al.Dynamic Tensile Failure of the Rock Interface Between Tuff and Basalt[J].Rock Mechanics and Rock Engineering,2012,45(3):341-348.
[12] LI Xi-bing,ZOU Yang,ZHOU Zi-long.Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method[J].Rock Mechanics and Rock Engineering,2014,47(5):1693-1709.
[13] ZHU W C,BAI Y,LI X B.Numerical Simulation on Rock Failure under Combined Static and Dynamic Loading during SHPB Tests[J].International Journal of Impact Engineering,2012,49:142-157.
[14] XU Y,DAI F,XU N W,et al.Numerical Investigation of Dynamic Rock Fracture Toughness Determination Using a Semi-circular Bend Specimen in Split Hopkinson Pressure Bar Testing[J].Rock Mechanics and Rock Engineering,2016,49(3):731-745.
[15] 李晓峰,李海波,刘凯,等.冲击荷载作用下岩石动态力学特性及破裂特征研究[J].岩石力学与工程学报,2017,36(4):887-892.
[16] 殷鹏飞.层状复合岩石试样力学特性单轴压缩试验与颗粒流模拟研究[D].徐州:中国矿业大学,2016.
[17] TIEN Yong-ming,KUO Ming-chuan,JUANG Charng-hsein.An Experimental Investigation of the Failure Mechanism of Simulated Transversely Isotropic Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2006,43(8):1163-1181.
[18] 周子龙,李夕兵,岩小明.岩石SHPB测试中试样恒应变率变形的加载条件[J].岩石力学与工程学报,2009,28(12):2445-2452.
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