减震沟对台阶爆破地震波减震机理探讨
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摘要
为研究减震沟的减震机理,基于爆破地震波中体波和表面波的传播特性,利用弹性波的反射和透射理论分别分析减震沟对体波、表面波的削弱作用,推导出修正后的质点振动速度公式并用来描述表面波的衰减规律。应用ANSYS/LS-DYNA模拟台阶爆破,通过对有减震沟和无减震沟时岩体内部测点和表面测点质点振动速度对比分析,验证了分开考虑体波和表面波的合理性。研究结果表明:体波的衰减与减震沟的深度和宽度都有关,其中减震沟的深度对体波的衰减起主要作用;表面波的衰减仅与减震沟的深度有关,减震沟的宽度对表面波没有影响。
In order to study the absorption mechanism of damping bitch,the absorption effect of damping bitch to body wave and surface wave was analyzed by reflection and transmission theories based on the propagation property of body wave and surface wave.The particle vibration velocity formula was deduced to describe the attenuation of surface wave.The bench blasting was simulated by taking advantage of the finite element ANSYS/LS-DYNA software.The particle vibration velocity of inner and surface measured point without the damping bitch or not was analyzed and compared.The rationality of considering the effect of damping bitch to the body wave and surface wave separately was verified.The results show that the decay of body wave both concerns with the depth and width of damping bitch,the depth of damping bitch plays the main role,the decay of surface wave only concerns with the depth of the damping bitch.
In order to study the absorption mechanism of damping bitch,the absorption effect of damping bitch to body wave and surface wave was analyzed by reflection and transmission theories based on the propagation property of body wave and surface wave.The particle vibration velocity formula was deduced to describe the attenuation of surface wave.The bench blasting was simulated by taking advantage of the finite element ANSYS/LS-DYNA software.The particle vibration velocity of inner and surface measured point without the damping bitch or not was analyzed and compared.The rationality of considering the effect of damping bitch to the body wave and surface wave separately was verified.The results show that the decay of body wave both concerns with the depth and width of damping bitch,the depth of damping bitch plays the main role,the decay of surface wave only concerns with the depth of the damping bitch.
引文
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[15]李永池,姚磊,沈俊,等.空穴的绕射隔离效应和对后方应力波的削弱作用[J].爆炸与冲击,2005,25(3):193-198.Li Yongchi,Yao Lei,Shen Jun,et al.Insulation effect of the cavityon stress wave[J].Explosion and Shock Waves,2005,25(3):193-198.
[2]Langfors U,Kihlstr B M.The modern technique of rock blasting[J].Almqvist&Wiksell,1963:258-295.
[3]方向,高振儒,龙源,等.减震沟对爆破震动减震效果的实验研究[J].工程爆破,2002,8(4):20-23.Fang Xiang,Gao Zhenru,Long Yuan,et al.Experimental study onthe effect of damping bitch on reduction of blasting vibration[J].Engineering Blasting,2002,8(4):20-23.
[4]郭学彬,肖正学,张志呈,等.爆破地震作用的沟槽效应[J].爆破器材料,1999,28(3):4-7.Guo Xuebin,Xiao Zhengxue,Zhang Zhicheng,et al.Channel effectof blasting vibration[J].Explosive Materials,1999,28(3):4-7.
[5]娄建武,龙源,周翔,等.爆炸波传播的沟槽效应及分析[J].矿冶工程,2004,24(1):11-15.Lou Jianwu,Long Yuan,Zhou Xiang,et al.Damping ditch effect inpropagation of blasting seismic wave and its analysis[J].Mining andMetallrugical Engineering,2004,24(1):11-15.
[6]彭德红.露天矿边坡开挖爆破震动动力响应分析[J].煤炭学报,2005,30(6):705-709.Peng Dehong.Analysis of dynamic response on blasting vibrationaboutexcavated slope in a surface mine[J].Journal of China CoalSociety,2005,30(6):705-709.
[7]郑水明,姚运生,曾心传.工程场地隔振沟减震效应[J].爆破,2008,25(3):103-106.Zheng Shuiming,Yao Yunsheng,Zeng Xinchuan.Vibration-isolatingeffect of vibration-isolating slot in project site[J].Blasting,2008,25(3):103-106.
[8]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):49-52.Yi Changping,Chen Ming,Lu Wenbo,et al.Numercial simulation fordamping effect of damping ditch[J].Engineering Journal of WuhanUniversity,2005,38(1):49-52.
[9]蒋伯杰,邹奕芳,易长平.减震沟减震效果的动力有限元数值模拟研究[J].中国农村水利水电,2004(8):89-91.Jiang Bojie,Zou Yifang,Yi Changping.The dynamic FEM numericalsimulation for the vibration-isolating effect of vibration-isolating slot[J].China Rural Water and Hydropower,2004(8):89-91.
[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 Kaishui,Chen Tianzhu,Yi Changping.Numerical simulationfor vibration-isolating effect of vibration-isolating slot[J].Blasting,2006,23(3):18-21.
[11]丁希平,王中黔,冯叔瑜.堵塞长度对台阶爆破作用影响的数值模拟[J].煤炭学报,2001,26(4):370-373.Ding Xiping,Wang Zhongqian,Feng Shuyu.Simulation on effect ofstemming length to deep hole bench blasting[J].Journal of ChinaCoal Society,2001,26(4):370-373.
[12]刘德顺,何先可,段凯,等.基于入、反射波的杆波阻特性反演方法[J].煤炭学报,2009,34(9):1 281-1 284.Liu Deshun,He Xianke,Duan Kai,et al.The inversion of variablecharacteristics in pedance of the rod based on incident waves andreflection waves[J].Journal of China Coal Society,2009,34(9):1 281-1 284.
[13]朱小明,宋宏伟,刘辉.岩石中爆炸应力波衰减规律[J].山西建筑,2007,33(31):112-113.Zhu Xiaoming,Song Hongwei,Liu Hui.The attenuation regular ofblasting stress wave in rocks[J].Shanxi Architecture,2007,33(31):112-113.
[14]胡刚,郝传波,景海河.爆炸作用下岩石介质应力波传播规律研究[J].煤炭学报,2001,26(3):270-273.Hu Gang,Hao Chuanbo,Jing Haihe.Study of the laws of stresswave propagation in rock bar under blasting loading[J].Journal ofChina Coal Society,2001,26(3):270-273.
[15]李永池,姚磊,沈俊,等.空穴的绕射隔离效应和对后方应力波的削弱作用[J].爆炸与冲击,2005,25(3):193-198.Li Yongchi,Yao Lei,Shen Jun,et al.Insulation effect of the cavityon stress wave[J].Explosion and Shock Waves,2005,25(3):193-198.
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