立井爆破掘进空隙高度优化设计的小波包分析
Wavelet Packet Analysis for Optimization Design of Gap Height in Shaft Blasting Excavation
-
摘要: 为了研究空隙高度对井壁震动强度影响，利用有限元建立井筒爆破模型并采集震动信号，根据工程现场监测数据对模型及其使用参数有效性进行检验，应用小波包分析方法对模拟信号进行频谱分析，为便于对比不同空隙高度相同位置监测点各子频带能量，提出能量归一化因子。研究结果表明：空隙高度是影响井壁震动强度重要因素，存在最不利空隙高度；本工程最不利空隙高度2.7 m，最优空隙高度3.6 m，在相同爆破方案前提下，震动峰值能量降低20%。各子频带能量衰减规律不一致，底模顶端、底端衰减规律也不相同，绕射端附近区域能量震荡激烈。底模井壁处于爆破地震波绕射作用局部震荡区域，爆破震动强度与爆心距相关关系不成立，顶端与底端震动强度没有固定大小规律。Abstract: In order to study the influence of the gap height on the vibration intensity of the shaft wall, a wellbore blasting model is established by finite element method, and the vibration signals are acquired from above model. The validity of the model itself and the parameters used in the model are tested by the on-site monitoring data. The wavelet packet analysis method is used to analyze the frequency spectrum of the monitoring signals; so as to facilitate to compare the energy of each sub-band of different monitoring points, an energy normalization factor is proposed. The results show that: the gap height is an important factor affecting the vibration strength of the shaft wall, there is the most unfavorable air gap height. The most unfavorable gap height is 2.7 m, and the optimal gap height is 3.6 m in this project, the peak vibration energy is reduced by 20% under the same blasting scheme. The attenuation laws of the sub-bands are inconsistent, and the attenuation laws at the top and bottom ends are also different, the energy in the vicinity of the diffraction ends is highly oscillatory. The wall of the bottom mold is in the local oscillatory region of blasting seismic wave diffraction, the correlation between the blasting vibration intensity and the core distance is not established, and the vibration intensity at the top and bottom ends is not fixed.
-
-
[1] 黄跃东,刘同海,徐福林.大直径深立井井筒基岩段快速施工技术[J].煤矿安全,2008,39(6):78-79. [2] 张馨.深立井硬岩深孔钻爆参数的研究与应用[J].煤炭学报,2003,28(4):403-408. [3] 韩博,张乃宏.立井井筒基岩段深孔爆破技术参数优化分析[J].煤炭工程,2012,44(3):29-31. [4] 丁凯,方向,范磊,等.减震沟对爆破地震波能量特性影响试验研究[J].振动与冲击,2012,31(13):113. [5] 中国生,房营光,徐国元,等.基于小波包分析的建(构)筑物爆破振动安全判据研究[J].岩土工程学报,2009,31(2):223-228. [6] 蒋丽丽,林从谋,陈泽观,等.岩石高边坡爆破振动传播规律小波包分析[J].有色金属(矿山部分),2009, 61(2):43-45. [7] 徐振洋,杨军,陈占扬,等.爆破地震波能量分布研究[J].振动与冲击,2014,33(11):38-42. [8] 单仁亮,白瑶,宋永威,等.冻结立井模型爆破振动信号的小波包分析[J].煤炭学报,2016,41(8):1923. [9] 单仁亮,宋永威,白瑶,等.基于小波包变换的爆破信号能量衰减特征研究[J].矿业科学学报,2018,3(2):119-128. [10] 黄琦.立井爆破模拟实验的砼井壁动力模型设计[J].山东矿业学院学报,1998,17(2):157-160. [11] 黄琦,胡峰.立井爆破震动对短段砌壁砼强度影响的模拟测试研究[J].山东矿业学院学报,1995,14(1):68-72. [12] 单仁亮,王二成,李慧,等.西北冻结立井砼井壁爆破损伤模型[J].煤炭学报,2015,40(3):522-527. [13] 王二成.西北地区冻结立井爆破对早期高强砼井壁损伤研究[D].北京:中国矿业大学(北京),2014:99-100. [14] 何东春,刘同海,邓洪义.YJM型模板在立井施工中的应用[J].煤炭技术,2005,24(2):83-84. [15] 铁木辛柯,古地尔.弹性理论[M].徐芝纶,译.北京:高等教育出版社,1990:41-42. [16] LS-DYNA Keyword Uesr’s Manual_R8.0[M]. California: Livermore Software Technology Corporation, 2015. [17] 巫绪涛,李耀,李和平.混凝土HJC本构模型参数的研究[J].应用力学学报,2010,27(2):340-344. [18] 杨伟军,王艳.混凝土早龄期的抗压强度与弹性模量的历时变化模型[J].中外公路,2007,27(6):149. -
期刊类型引用(0)
其他类型引用(1)
计量
- 文章访问数: 146
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 1
下载:
