基于EEMD的爆破振动能量安全分析
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摘要
针对爆破振动安全标准的缺陷和小波折合能量法存在基函数、分解尺度选择的问题,基于集成经验模式分解(EEMD)技术,提出爆破振动折合能量安全评判新方法。对爆破振动波进行EEMD分解,识别造成破坏的优势IMF分量,求取其能量和频率,并结合构筑物固有频率进行折合能量计算,以此进行安全评判。基于某矿实测爆破振动数据,计算各信号的折合能量,综合现场破坏情况,得出该矿爆破振动波折合能量安全阈值为1.0×10-7J。
A new appraisal method for safety of blasting vibration equivalent energy based on EEMD technology is proposed to deal with the safety criterion defects for blasting vibration and choice-making dilemma of mother wavelet and decomposition scales of wavelet packets equivalent energy. To begin with, the blasting vibration wave is EEMD- decomposed and the principal IMF components causing damage is identified. Then, the energy and frequency of principal IMF components are calculated, as well as equivalent energy computation considering the natural frequency of compounds for safety appraisal is conducted. It is deduced that the safety threshold of blasting vibration equivalent energy in the mine is 1.0×10-7J, based on collected blasting vibration field data,calculated equivalent energy of signals, and situation of on-site destruction.
引文
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