切槽炮孔偏心装药爆源近区裂纹动态力学特征实验研究
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摘要
为研究切槽炮孔偏心不耦合装药爆源近区裂纹动态力学特征,采用数字激光动态焦散线实验系统,对比分析3种切槽形状(三角形、圆形和矩形)对爆源近区裂纹扩展速度v和动态应力强度因子K_Ι~d和K_(ΙΙ)~d,以及能量释放率G的影响规律。实验结果表明:偏心爆炸荷载下,3种切槽尖端均产生非对称性裂纹,主、次裂纹分别位于装药耦合、不耦合侧;切槽形状对裂纹起裂影响较大,对裂纹扩展影响较小;起裂阶段,各主裂纹相比,三角形尖端主裂纹K_Ι~d,v,G最大,K_(ΙΙ)~d最小,有利于张开型裂纹起裂,而矩形尖端主裂纹K_Ι~d,v,G最小,K_(ΙΙ)~d最大,有利于压剪型裂纹起裂;扩展阶段,各主裂纹主要为张开型,K_(ΙΙ)~d趋于0,K_Ι~d,v,G整体变化一致。各次裂纹相比,矩形尖端次裂纹K_Ι~d,K_(ΙΙ)~d,v,G均最大,消耗较多爆炸能量,不利于主裂纹起裂和扩展。实验结果对于工程实践具有理论参考意义。
The digital laser dynamic caustics system(DLDC) was used to study crack initiation and propagation mechanisms near blasting source of grooved borehole with eccentric decouple charge.The effects of three grooves,i.e.triangle,circle and rectangle,on crack propagation velocity v,dynamic stress intensity factor K_Ι~d andK_(ΙΙ)~d,and energy release rate G were investigated.Experimental results show that asymmetrical cracks were created at three grooves tips under eccentric blast loading and the main crack was located at the charge side but secondary crack at the other side.Groove geometries made more effects on crack initiation than propagation.As for main cracks,triangle groove benefited for opening mode crack initiation with the largest K_Ι~d,v,and G but the smallest K_(ΙΙ)~d,however,rectangle groove benefited for compressive-shear mode crack initiation with the smallest K_Ι~d,v,and G but the largest K_(ΙΙ)~d.In crack propagation,main cracks of three grooves were mainly opening mode with similar trend in K_Ι~d,v and G,andK_(ΙΙ)~d is near to zero.As for secondary cracks,these from rectangle groove tip with the largest K_Ι~d,K_(ΙΙ)~d,v and G consumed much blasting energy,which was not beneficial for main crack initiation and propagation.The results have theoretical reference significance for engineering.
The digital laser dynamic caustics system(DLDC) was used to study crack initiation and propagation mechanisms near blasting source of grooved borehole with eccentric decouple charge.The effects of three grooves,i.e.triangle,circle and rectangle,on crack propagation velocity v,dynamic stress intensity factor K_Ι~d andK_(ΙΙ)~d,and energy release rate G were investigated.Experimental results show that asymmetrical cracks were created at three grooves tips under eccentric blast loading and the main crack was located at the charge side but secondary crack at the other side.Groove geometries made more effects on crack initiation than propagation.As for main cracks,triangle groove benefited for opening mode crack initiation with the largest K_Ι~d,v,and G but the smallest K_(ΙΙ)~d,however,rectangle groove benefited for compressive-shear mode crack initiation with the smallest K_Ι~d,v,and G but the largest K_(ΙΙ)~d.In crack propagation,main cracks of three grooves were mainly opening mode with similar trend in K_Ι~d,v and G,andK_(ΙΙ)~d is near to zero.As for secondary cracks,these from rectangle groove tip with the largest K_Ι~d,K_(ΙΙ)~d,v and G consumed much blasting energy,which was not beneficial for main crack initiation and propagation.The results have theoretical reference significance for engineering.
引文
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[2]宋守志.固体介质中的应力波[M].北京:煤炭工业出版社,1989:123-124.(SONG Shouzhi.Stress waves in solid media[M].Beijing:China Coal Industry Publishing House,1989:123-124.(in Chinese))
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[5]STECHER F P,FOURNEY W L.Prediction of crack motion from detonation in brittle materials[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1981,18(1):23-33.
[6]张志呈.切槽爆破参数的研究与生产实践[J].岩土工程学报,1996,18(2):104-108.(ZHANG Zhicheng.Study on grooved borehole blasting and engineering[J].Chinese Journal of Geotechnical Engineering,1996,18(2):104-108.(in Chinese))
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[10]岳中文,邱鹏,王煦,等.切槽孔掏槽爆破机制动态焦散线实验研究[J].煤炭学报,2016,41(4):858-863.(YUE Zhongwen,QIU Peng,WANG Xu,et al.Notched-borehole cut blasting study by the method of dynamic caustics[J].Journal of China Coal Society,2016,41(4):858-863.(in Chinese))
[11]岳中文,郭洋,王煦.切槽孔爆炸载荷下裂纹扩展行为的实验研究[J].岩石力学与工程学报,2015,34(10):2 018-2 026.(YUEZhongwen,GUO Yang,WANG Xu.Experimental study of crack propagation under blasting load in notched boreholes[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(10):2 018-2 026.(in Chinese))
[12]ROSSMANITH H P,DAEHNKE A,NASMILLNER R E K,et al.Fracture mechanics applications to drilling and blasting[J].Fatigue and Fracture of Engineering Materials and Structures,1997,20(11):1 617-1 636.
[13]PAPADOPOULOS G A.Fracture mechanics,the experimental method of caustics and the det.-criterion of fracture[M].London:SpringerVerlag,1993:25-116.
[14]KALTHOFF J F.Shadow optical method of caustics.In:Kobayashi as.Handbook on experimental mechanics[M].New Jersey:Prentice-Hall,1987:407-522.
[15]李庆扬,王能超,易大义.数值分析[M].北京:清华大学出版社,2001:118-160.(LI Qingyang,WANG Nengchao,YI Dayi.Numerical analysis[M].Beijing:Tsinghua University Press,2001:118-160.(in Chinese))
[16]YUE Z W,YANG L Y,WANG Y B.Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting[J].Fatigue and Fracture of Engineering Materials and Structures,2013,36(8):827-833.
[17]FERUND L B.Dynamic fracture mechanics[M].Edinburgh:Cambridge University Press,1990:221-295.
[2]宋守志.固体介质中的应力波[M].北京:煤炭工业出版社,1989:123-124.(SONG Shouzhi.Stress waves in solid media[M].Beijing:China Coal Industry Publishing House,1989:123-124.(in Chinese))
[3]戴俊.爆破工程[M].北京:机械工业出版社,2015:88-132.(DAIJun.Blasting engineering[M].Beijing:China Machine Press,2015:88-132.(in Chinese))
[4]LANGEFORS U,KIHLSTR?M B.The modern technique of rock blasting[M].New York:John Wiley and Sons,1978:296-321.
[5]STECHER F P,FOURNEY W L.Prediction of crack motion from detonation in brittle materials[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1981,18(1):23-33.
[6]张志呈.切槽爆破参数的研究与生产实践[J].岩土工程学报,1996,18(2):104-108.(ZHANG Zhicheng.Study on grooved borehole blasting and engineering[J].Chinese Journal of Geotechnical Engineering,1996,18(2):104-108.(in Chinese))
[7]郑周练,陈山林,叶晓明,等.螺旋切槽孔松动爆破模型试验研究[J].岩石力学与工程学报,2004,23(3):446-449.(ZHENG Zhoulian,CHEN Shanlin,YE Xiaoming,et al.Model testing study on prefabricated spiral v-notch blasting[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):446-449.(in Chinese))
[8]李清,王平虎,杨仁树,等.切槽孔爆破动态力学特征的动焦散线实验[J].爆炸与冲击,2009,29(4):413-418.(LI Qing,WANGPinghu,YANG Renshu,et al.Experimental investigation on dynamic mechanical behaviors of cracks induced by v-notch borehole blasting with dynamic caustics[J].Explosion and Shock Waves,2009,29(4):413-418.(in Chinese))
[9]杨仁树,岳中文,肖同社,等.节理介质断裂控制爆破裂纹扩展的动焦散试验研究[J].岩石力学与工程学报,2008,27(2):244-250.(YANG Renshu,YUE Zhongwen,XIAO Tongshe,et al.Dynamic caustics experiment on crack propagation of jointed medium fracture with controlled blasting[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(2):244-250.(in Chinese))
[10]岳中文,邱鹏,王煦,等.切槽孔掏槽爆破机制动态焦散线实验研究[J].煤炭学报,2016,41(4):858-863.(YUE Zhongwen,QIU Peng,WANG Xu,et al.Notched-borehole cut blasting study by the method of dynamic caustics[J].Journal of China Coal Society,2016,41(4):858-863.(in Chinese))
[11]岳中文,郭洋,王煦.切槽孔爆炸载荷下裂纹扩展行为的实验研究[J].岩石力学与工程学报,2015,34(10):2 018-2 026.(YUEZhongwen,GUO Yang,WANG Xu.Experimental study of crack propagation under blasting load in notched boreholes[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(10):2 018-2 026.(in Chinese))
[12]ROSSMANITH H P,DAEHNKE A,NASMILLNER R E K,et al.Fracture mechanics applications to drilling and blasting[J].Fatigue and Fracture of Engineering Materials and Structures,1997,20(11):1 617-1 636.
[13]PAPADOPOULOS G A.Fracture mechanics,the experimental method of caustics and the det.-criterion of fracture[M].London:SpringerVerlag,1993:25-116.
[14]KALTHOFF J F.Shadow optical method of caustics.In:Kobayashi as.Handbook on experimental mechanics[M].New Jersey:Prentice-Hall,1987:407-522.
[15]李庆扬,王能超,易大义.数值分析[M].北京:清华大学出版社,2001:118-160.(LI Qingyang,WANG Nengchao,YI Dayi.Numerical analysis[M].Beijing:Tsinghua University Press,2001:118-160.(in Chinese))
[16]YUE Z W,YANG L Y,WANG Y B.Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting[J].Fatigue and Fracture of Engineering Materials and Structures,2013,36(8):827-833.
[17]FERUND L B.Dynamic fracture mechanics[M].Edinburgh:Cambridge University Press,1990:221-295.