爆破震动瞬时能量与岩体相对位移响应的关联性研究

通过结构动力方程求解得到岩体相对位移响应过程,以EEMD-HHT信号分析方法获得岩体爆破震动信号瞬时能量,在时域内进行分析研究岩体爆破震动信号瞬时能量与岩体相对位移响应的关系,发现岩体最大相对位移响应值滞后于爆破震动信号最大瞬时能量值的时刻;在时域内岩体相对位移响应过程曲线与爆破震动信号能量幅值并非相互对应,但与爆破震动速度时程曲线具有一定的关联性,这表明爆破震动激励下岩体相对位移响应值的大小与爆破震动能量、岩体的自振周期、爆破震动类型有关。

Study on correlation between instantaneous energy of blasting vibration and relative displacement response of rock mass

The relative displacement response of rock mass is obtained through the solution of the structural dynamic equation，while the instantaneous energy of blasting vibration is obtained with the method of EEMD-HHT，and then the correlation between the instantaneous energy of blasting vibration and the relative displacement response of rock mass is analyzed and studied within the relevant time domain. It is found out that the moment of the maximum value of the relative displacement response lags behind that of the maximum instantaneous energy of blasting vibration. Meanwhile，the process curve of the relative displacement response is not corresponded to the signal amplitude of the blasting vibration energy，but has certain correlation with the time-travel curve of the blasting vibration velocity. It is indicated that the magnitude of the relative displacement response value of rock mass under the condition of the blasting vibration excitation is related to the energy of blasting vibration，the natural vibration period of rock mass and the type of blasting vibration.