充填环境下预裂缝的爆破动力响应分析
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摘要
根据广西高峰矿新采矿方法的工程实际情况,采用高能炸药的Joles-Wilkins-Lee(JWL)状态方程,以质点振动速度峰值PPV为主要指标,利用显式动力分析软件ANSYS/LS-DYNA模拟充填采矿中预裂缝对爆炸应力波的作用机理,分析爆炸应力波在充填环境下的传播特征以及在经过预裂缝和不同介质分界面的衰减规律。研究结果表明:爆炸应力波在经过预裂缝时,质点振动速度峰值急剧衰减,预裂缝具有良好的降振效应,降振率在80%~90%之间;不同介质的分界面弱结构具有一定的降振效应,降振率在3%~10%之间;在邻近爆源一侧,预裂缝和分界面表现出能量聚集效应,且距预裂缝和分界面越近,能量聚集效应越明显,其能量聚集率最大可达25%。
According to the site of new mining method in Gaofeng mine in Guangxi Province,the mechanism of the pre-splitting crack to the explosive stress waves in filling-environment was simulated by the explicit dynamical analysis software package ANSYS/LS-DYNA.The numerical geometric model was built and JWL state equation of high explosive was used.The effect of blasting vibration on the pre-splitting crack was analyzed using the propagation characteristics and attenuation law of the explosion stress waves.The peak particle vibration(PPV) was used as discriminant index.The results show that the pre-splitting has a good damping effect,and the damping ratio is 80%-90%.The weak structure existing in the interface of different mediums shows a certain damping effect,the damping ratio is 3%-10%.The pre-splitting crack and interface display a certain energy gathering effect on the side close to the explosion source.And the closer the pre-splitting crack to interface,the more remarkable the energy gathering effect,and the highest ratio can reach 25%.
According to the site of new mining method in Gaofeng mine in Guangxi Province,the mechanism of the pre-splitting crack to the explosive stress waves in filling-environment was simulated by the explicit dynamical analysis software package ANSYS/LS-DYNA.The numerical geometric model was built and JWL state equation of high explosive was used.The effect of blasting vibration on the pre-splitting crack was analyzed using the propagation characteristics and attenuation law of the explosion stress waves.The peak particle vibration(PPV) was used as discriminant index.The results show that the pre-splitting has a good damping effect,and the damping ratio is 80%-90%.The weak structure existing in the interface of different mediums shows a certain damping effect,the damping ratio is 3%-10%.The pre-splitting crack and interface display a certain energy gathering effect on the side close to the explosion source.And the closer the pre-splitting crack to interface,the more remarkable the energy gathering effect,and the highest ratio can reach 25%.
引文
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[14]Korichi T,Bachir B.Design of a model blasting system to measure peak P-wave stress[J].Soil Dynamics and Earthquake Engineering,2003,23(4):513-519.
[15]Livermore Software Technology Corporation.LS-DYNA theoretical manual[R].Utah:Livermore Software Technology Corporation,1998:610-611.
[16]张雪亮,黄树棠.爆破地震效应[M].北京:地震出版社,1981:104-106.ZHANG Xue-liang,HUANG Shu-tang.Effect of blasting ground vibration[M].Beijing:Earthquake Publishing House,1981:104-106.
[2]鞠杨,环小丰,宋振铎,等.损伤围岩中爆炸应力波动的数值模拟[J].爆炸与冲击,2007,27(2):136-142.JU Yang,HUAN Xiao-feng,SONG Zhen-duo,et al.Numerical analyses of blast wave stress propagation and damage evolution in rock masses[J].Explosion and Shock Waves,2007,27(2):136-142.
[3]李夕兵.论岩体软弱结构面对应力波传播的影响[J].爆炸与冲击,1993,13(4):334-342.LI Xi-bing.Influence of the structural weakness planes in rock mass on propagation of stress waves[J].Explosion and Shock Waves,1993,13(4):334-342.
[4]王卫华,李夕兵,周子龙,等.不同应力波在张开节理处的能量传递规律[J].中南大学学报:自然科学版,2006,37(2):376-380.WANG Wei-hua,LI Xi-bing,ZHOU Zi-long,et al.Energy-transmitted rule of various stress w aves across open joint[J].Journal of Central South University:Science and Technology,2006,37(2):376-380.
[5]Myer L R.Effects of Single Fracture on Seismic Wave Propagation[C]//Barton&Stephansson,eds Rock Joints.Rotterdam:Bakema,1990:467-473.
[6]卢文波,赖世骧,董振华.岩石钻爆开挖中预裂缝的隔震效果分析[J].爆炸与冲击,1997,17(3):193-198.LU Wen-bo,LAI Shi-xiang,DONG Zhen-hua.Analysis of vibration isolating effect of pre-splitting crack in rock excavation by blasting[J].Explosion and Shock Waves,1997,17(3):193-198.
[7]王明洋,唐廷,周泽平.断裂构造对爆炸地震波传播规律的影响[J].岩石力学与工程学报,2005,24(增1):4635-4641.WANG Ming-yang,TANG Ting,ZHOU Ze-ping.Effects of geogical structural faults on blasting seismic wave propagation[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.1):4635-4641.
[8]梁岗,贺鹏飞.粘弹性双材料界面裂缝的缝端位移场及动态断裂分析[J].力学季刊,2007,28(1):34-40.LIANG Gang,HE Peng-fei.The viscoelastic bi-materials interfacial displacement fields in crack tip vicinity and dynamic fracture analysis[J].Chinese Quarterly of Mechanics,2007,28(1):34-40.
[9]Chen S G,Zhao J,Zhou Y X.UDEC modeling of a field explosion test[J].International Journal of Blasting and Fragmentation,2000(4):149-163.
[10]梁开水,陈天珠,易长平.减震沟减震效果的数值模拟研究[J].爆破,2006,23(3):18-21.LIANG Kai-shui,CHEN Tian-zhu,YI Chang-ping.Numerical simulation for vibration-isolating effect of vibration-isolating slot[J].Blasting,2006,23(3):18-21.
[11]易长平,陈明,卢文波,等.减震沟减震的数值模拟[J].武汉大学学报,2005,38(1):49-51.YI Chang-ping,CHEN Ming,LU Wen-bo,et al.Numerical simulation for damping effect of damping ditch[J].Engineering Journal of Wuhan University,2005,38(1):49-51.
[12]罗毓,刘雁鹰,易长平.预裂缝参数对减振效果影响的数值分析[J].爆破,2007,24(2):25-35.LUO Yu,LIU Yan-ying,YI Chang-ping.Numerical simulation analysis of the effect of pre-splitting crack parameters on damping vibration[J].Blasting,2007,24(2):25-35.
[13]史秀志.爆破振动信号时频分析与爆破振动特征参量和危害预测研究[D].长沙:中南大学资源与安全工程学院,2007:62-63.SHI Xiou-zhi.Study of time and frequency analysis of blasting vibration signal and the prediction of blasting vibration characteristic parameters and damage[D].Changsha:Central South University,School of Resources and Safety Engineering,2007:62-63.
[14]Korichi T,Bachir B.Design of a model blasting system to measure peak P-wave stress[J].Soil Dynamics and Earthquake Engineering,2003,23(4):513-519.
[15]Livermore Software Technology Corporation.LS-DYNA theoretical manual[R].Utah:Livermore Software Technology Corporation,1998:610-611.
[16]张雪亮,黄树棠.爆破地震效应[M].北京:地震出版社,1981:104-106.ZHANG Xue-liang,HUANG Shu-tang.Effect of blasting ground vibration[M].Beijing:Earthquake Publishing House,1981:104-106.
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