岩巷围岩介质中冲击震动波传播效应数值模拟及频谱特性分析

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摘要为了研究冲击矿压发生时岩巷围岩介质中冲击震动波传播衰减规律以及巷道围岩响应特征，以传播效应分析模型为基础，采用FLAC3D模拟软件建立数值模型，在模型内部加载冲击震源动力条件，并分别在指定位置布设冲击震动波监测点，利用Dynamic动力分析模块进行模拟运算，运用MATLAB软件对各测点采集的冲击震动波信号进行频谱特性分析，进而研究岩巷围岩介质中冲击震动波传播效应。研究结果表明：(1) 冲击震动波能量沿巷道走向与震源的距离呈幂关系衰减，短距离内震动波能量衰减很快，达到一定距离后能量衰减不明显。(2) 顶板监测到的冲击震动波能量最大，肩窝受到的震动影响次之，帮部和底板区位受到的震动影响相对最小。这些结论为进一步研究冲击矿压发生过程中冲击震动波传播规律以及对煤矿巷道的损伤破坏特点提供理论基础。

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关键词 ：采矿工程, 岩巷, 冲击矿压, 冲击震动波, 传播衰减规律, 围岩响应特征, 频谱特性

Abstract：In order to study the propagation attenuation law of vibration wave produced by rockburst in surrounding rocks of roadway and the surrounding rocks response characteristics，a numerical model is built by FLAC3D software based on propagation effects analytical model. The vibration source is loaded in the model，and the monitoring points of vibration wave produced by rockburst are emplaced in designated position. The model is analog calculated through dynamic analysis module，and the spectrum characteristics of vibration signals collected by monitoring points are analyzed with MATLAB software. Then vibration wave propagation effects produced by rockburst in surrounding rocks of roadway can be further studied. Results show that：(1) The power attenuation relationship between vibration wave produced by rockburst and focal distance is found along roadway. Vibration wave decays rapidly at the short distances while it decays slowly at longer distances. (2) Vibration wave energy produced by rockburst on roof is the maximum. Vibration influence on shoulders is smaller and minimum on sides and floor. These conclusions provide certain theoretical foundation on further research of vibration wave produced by rockburst propagation law and roadway destructive characters.

Key words： mining engineering rock roadway rockburst vibration wave produced by rockburst propagation attenuation law surrounding rock response characteristics spectrum characteristics

收稿日期: 2012-12-17

引用本文:

牛建春1，2，刘波涛2. 岩巷围岩介质中冲击震动波传播效应数值模拟及频谱特性分析[J]. 岩石力学与工程学报, 2014, 33(sl): 3256-3262.
NIU Jianchun1，2，LIU Botao2. NUMERICAL SIMULATION AND SPECTRUM CHARACTERISTICS ANALYSIS OF VIBRATION WAVE PROPAGATION EFFECTS PRODUCED BY ROCKBURST IN SURROUNDING ROCKS OF ROADWAY. , 2014, 33(sl): 3256-3262.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3256

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