基于模型试验的台阶爆破近中区边坡震动效应数值模拟
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摘要
为了降低台阶爆破近中区边坡上质点震动强度,在文献[1]室内模型试验基础上,采用LS-DYNA有限元软件对台阶爆破近中区边坡震动效应进行模拟研究。通过改变数值模型中条形药柱埋深、预裂缝设置位置、预裂缝深度,分析近中区边坡上质点震动变化规律。研究结果表明:坡面质点均值震速与药柱埋深呈线性衰减关系,衰减因子-0.1;预裂缝设置位置对减震效果产生重要影响,预裂缝距边坡越近减振效果越好,预裂缝深度是药柱埋深0.45～0.8倍时减震效果最理想。研究结果对降低台阶爆破近中区边坡震动效应有一定指导价值。
In order to reduce the vibration intensity of mass points on the slope in the near and middle field of bench blasting,based on the indoor physical model experiment in literature~([1]),the LS-DYNA finite element software was used to simulate the vibration effect of those mass points.By changing the buried depth of the bar column,as well as the location and the depth of the pre-split crack in the numerical model,the variation law of mass point vibration in those field was analyzed.The numerical simulation results showed that:the mean vibration velocity of the slope surface mass point was linearly attenuated with the buried depth of bar column,and the attenuation factor was -0.1;the position of the pre-split crack had a significant influence on the damping effect,the closer the pre-split crack to the slope,the better the damping effect in the modal;when the depth of the pre-split crack was 0.45～0.8 times of the depth of the bar column,the damping effect was the best.The research results had a certain guiding value for reducing the vibration effect of slope in the near and middle field of bench blasting.
In order to reduce the vibration intensity of mass points on the slope in the near and middle field of bench blasting,based on the indoor physical model experiment in literature~([1]),the LS-DYNA finite element software was used to simulate the vibration effect of those mass points.By changing the buried depth of the bar column,as well as the location and the depth of the pre-split crack in the numerical model,the variation law of mass point vibration in those field was analyzed.The numerical simulation results showed that:the mean vibration velocity of the slope surface mass point was linearly attenuated with the buried depth of bar column,and the attenuation factor was -0.1;the position of the pre-split crack had a significant influence on the damping effect,the closer the pre-split crack to the slope,the better the damping effect in the modal;when the depth of the pre-split crack was 0.45～0.8 times of the depth of the bar column,the damping effect was the best.The research results had a certain guiding value for reducing the vibration effect of slope in the near and middle field of bench blasting.
引文
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[12]杨年华.条形药包端部效应的研究[J].爆炸与冲击,1997,17(3):214-219.
[2]张义平,吴桂义.爆破地震波特性研究[J].矿业研究与开发,2007,27(6):68-72.
[3]高富强,张光雄,杨军.露天台阶爆破干扰降振作用机理及其应用[J].矿业研究与开发,2016,36(11):18-21.
[4]何理,钟冬望,陈晨,等.岩质高边坡开挖施工的爆破振动监测与分析[J].金属矿山,2017,(1):6-10.
[5]魏格平,原凯,晏照钦,等.昊达露天煤矿台阶爆破振动影响因素及减振实验[J].工程爆破,2017,23(5):33-37.
[6]武旭,张云鹏,郭奇峰.台阶地形爆破振动放大与衰减效应研究[J].爆炸与冲击,2017,37(6):1017-1022.
[7]韩亮,辛崇伟,梁书锋,等.深孔台阶爆破近远区振动特征的试验研究[J].振动与冲击,2017,36(8):65-70.
[8]万鹏鹏,璩世杰,许文耀,等.台阶爆破质点振速的高程效应研究[J].爆破,2015,32(2):29-32,63.
[9]饶宇,夏元友,胡英国,等.预裂缝对爆破振动频谱分布特征的影响[J].振动与冲击,2017,36(7):191-198.
[10]Livermore Software Technology Corporation.LS-DYNAKeyword Uesr's Manual_R8.0[M].California,2015.
[11]邹奕芳.预裂缝和减震槽减震效果的爆破试验研究[J].爆破,2005,22(2):97-99.
[12]杨年华.条形药包端部效应的研究[J].爆炸与冲击,1997,17(3):214-219.