冲击载荷下层状岩体动态断裂行为的模拟试验研究
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摘要
采用有机玻璃和环氧树脂两种材料组成的试件模拟层状岩体,对层状岩体的动态断裂行为进行了动态焦散线三点弯曲冲击试验研究。试验结果表明,裂纹扩展到层理面时,不是直接穿过层理面沿原扩展方向继续扩展,而是产生一定的偏移后再继续扩展,其偏移距离与预制裂纹和层理面夹角有关,预制裂纹与层理面夹角越大,裂纹的偏移距离越大;当预制裂纹与层理面夹角<90°时,裂纹穿过层理面后只产生一条偏移裂纹,而夹角为90°时,裂纹扩展至层理面后将产生两条偏移裂纹,并且这两条裂纹轨迹几乎对称;裂纹扩展过程中,随着裂纹尖端距层理面的距离减小,裂纹尖端动态应力强度因子Kd1和裂纹扩展速度v均逐渐减小,说明层理面对裂纹的扩展起阻碍作用,预制裂纹与层理夹角越大阻碍作用越大。研究结果对工程实践有重要的参考价值。
By using specimens consisting of polymethyl methacrylate(PMMA) and epoxy resin,the dynamic threepoint bending caustic experiments under impact loading were performed to study the fracture behaviors of layered rocks.The results are listed as follows.Cracking deviation happens on the bedding surface during the fracture process,which causes the crack not to develop directly through the surface along the original path.The offset is influence by the angle between the pre-existing crack and the bedding surface.With the angle increasing,the offset gets more.When the angle is less than 90°,only one deviation crack generates on the bedding surface.For the angle of 90°,two deviation cracks,of which the propagation paths are almost symmetric,generate on the bedding surface.The dynamic stress intensity factor Kd1 and propagation velocity v of crack tip decline gradually with the decrease of the distance between the bedding surface and crack tip,indicating that bedding surface shows crack resistance effect and such effect grows stronger with the the angle between pre-existing crack and the bedding surface.
By using specimens consisting of polymethyl methacrylate(PMMA) and epoxy resin,the dynamic threepoint bending caustic experiments under impact loading were performed to study the fracture behaviors of layered rocks.The results are listed as follows.Cracking deviation happens on the bedding surface during the fracture process,which causes the crack not to develop directly through the surface along the original path.The offset is influence by the angle between the pre-existing crack and the bedding surface.With the angle increasing,the offset gets more.When the angle is less than 90°,only one deviation crack generates on the bedding surface.For the angle of 90°,two deviation cracks,of which the propagation paths are almost symmetric,generate on the bedding surface.The dynamic stress intensity factor Kd1 and propagation velocity v of crack tip decline gradually with the decrease of the distance between the bedding surface and crack tip,indicating that bedding surface shows crack resistance effect and such effect grows stronger with the the angle between pre-existing crack and the bedding surface.
引文
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[15]岳中文,陈彪,杨仁树.冲击载荷下岩石材料动态断裂韧性测试研究进展[J].工程爆破,2015,21(6):60-66.YUE Zhongwen,CHEN Biao,YANG Renshu.Development and new achievements on rock dynamic fracture toughness testing under impact load[J].Engineering Blasting,2015,21(6):60-66.
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[18]KUTTER H K,FAIRHURST C.On the fracture process in blasting[C]//International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts.Pergamon,1971,8(3):181IN1189-188IN10202.
[19]ROSSMANITH H P,DAEHNKE A,NASMILLNER R E K,et al.Fracture mechanics applications to drilling and blasting[J].Fatigue&Fracture of Engineering Materials&Structures,1997,20(11):1617-1636.
[2]KUO A Y.Transient stress intensity factors of an interfacial crack between two dissimilar anisotropic half-spaces[J].Journal of Applied Mechanics.1984,51(1):71-76.
[3]ITOU S.Transient dynamic stress intensity factors around a crack in a nonhomogeneous interfacial layer between two dissimilar elastic half-planes[J].International Journal of Solids and Structures.2001,38(20):3631-3645.
[4]SHUI C W,LEE K Y.Dynamic response of subsurface interface crack in multilayered orthotropic half-space under anti-plane shear impact loading[J].International Journal of Solids and Structures,2001,38(20):3563-3574.
[5]刘立,朱文喜,路军富,等.层状岩体损伤演化与应变关系的研究[J].岩石力学与工程学报,2006,25(2):350-354.LIU Li,ZHU Wenxi,LU Junfu,et al.Research on relation between damage evolution and strain of stratified rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):350-354.
[6]CHOI H J.Impact behavior of an inclined edge crack in a layered medium with a graded nonhomogeneous interfacial zone:Antiplane deformation[J].Acta Mechanica,2007,193(1/2):67-84.
[7]WUNSCH M,ZHANG C H,SLADEK J,et al.Transient dynamic analysis of interface cracks in layered anisotropic solids under impact loading[J].International Journal of Fracture,2009,157(1/2):131-147.
[8]何忠明,彭振斌,曹平,等.层状岩体单轴压缩室内试验分析与数值模拟[J].中南大学学报(自然科学版),2010,41(5):1906-1912.HE Zhongming,PENG Zhenbin,CAO Ping,et al.Test and numerical simulation for stratified rock mass under uniaxial compression[J].Journal of Central South University(Science and Technology),2010,41(5):1906-1912.
[9]黄书岭,丁秀丽,邬爱清,等.层状岩体多节理本构模型与试验验证[J].岩石力学与工程学报,2012,31(8):1627-1635.HUANG Shuling,DING Xiuli,WU Aiqing,et al.Study of multi-joint constitutive model of layered rock mass and experimental verification[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(8):1627-1635.
[10]BALAMURUGAN M S,HAREESH V T.Dynamic crack propagation in layered transparent materials studied using digital gradient sensing method[C]//Proceedings of the2014 Annual Conference on Experimental and Applied Mechanics,2014,30:197-205.
[11]代树红,王召,马胜利,等.裂纹在层状岩石中扩展特征的研究[J].煤炭学报,2014,39(2):315-321.DAI Shuhong,WANG Zhao,MA Shengli,et al.Study on characteristics of crack propagation in stratified rock[J].Journal of China Coal Society,2014,39(2):315-321.
[12]包春燕.层状岩石类材料间隔破裂机理及其数值试验研究[D].大连:大连理工大学,2014.
[13]熊良宵,虞利军,杨昌斌,等.卸载条件下层状岩体力学特性研究[J].岩石力学与工程学报,2014,33(2):3545-3554.XIONG Liangxiao,YU Lijun,YANG Changbin,et al.Research on mechanical characteristics of interlayered rock mass under unloading condition[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(2):3545-3554.
[14]王炳军,肖洪天,孙凌志,等.层状岩体各向异性对裂纹断裂特性影响研究[J].地下空间与工程学报,2014,10(2):1755-1761.WANG Bingjun,XIAO Hongtian,SUN Lingzhi,et al.Effect of the anisotropy of the layered rock mass on the fracture behaviours of its embedded cracks[J].Chinese Journal of Underground Space and Engineering,2014,10(2):1755-1761.
[15]岳中文,陈彪,杨仁树.冲击载荷下岩石材料动态断裂韧性测试研究进展[J].工程爆破,2015,21(6):60-66.YUE Zhongwen,CHEN Biao,YANG Renshu.Development and new achievements on rock dynamic fracture toughness testing under impact load[J].Engineering Blasting,2015,21(6):60-66.
[16]THEOCARIS P S,ANDRIANOPOULOS N P.Dynamic three-point bending of short beams studied by caustics[J].International Journal of Solids and Structures,1981,17(7):707-715.
[17]NAKAGAWA K,SAKAMOTO T,YOSHIKAI R.Model study of the guide hole effect on the smooth blasting[J].J Jpn Exp Soc,1982,43:75-82.
[18]KUTTER H K,FAIRHURST C.On the fracture process in blasting[C]//International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts.Pergamon,1971,8(3):181IN1189-188IN10202.
[19]ROSSMANITH H P,DAEHNKE A,NASMILLNER R E K,et al.Fracture mechanics applications to drilling and blasting[J].Fatigue&Fracture of Engineering Materials&Structures,1997,20(11):1617-1636.