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高地应力条件下隧洞爆破开挖中,岩体初始应力的瞬态卸载诱发的振动是岩体爆破开挖振动的重要组成部分。为揭示地应力瞬态卸载诱发振动能量特征及其对爆破开挖振动能量分布的影响,采用基于功率谱的振动能量分析方法,研究爆炸荷载和不同水平地应力瞬态卸载诱发的振动能量频域分布特征。研究表明:爆炸荷载与地应力瞬态卸载诱发振动的能量频域分布范围基本一致,但瞬态卸载诱发振动主频一般低于爆炸荷载诱发振动主频;地应力瞬态卸载诱发振动会增加爆破振动能量的低频成分,是影响爆破开挖振动能量分布特性的重要因素;地应力水平的提高会增大地应力瞬态卸载诱发振动的幅值,对能量的频域分布无影响。
During tunnel blasting excavation under high ground stress, the vibration induced by the transient unloading of the initial stress of rock mass is an important part of rock blasting excavation. In order to reveal the characteristics of induced vibration energy of ground stress transient unloading and its influence on vibration energy distribution of blasting excavation, a vibration energy analysis method based on power spectrum was used to study the effects of explosion load and different levels of transient energy-induced vibration energy frequency domain Distribution characteristics. The research shows that the range of energy distribution of vibration induced by transient unloading of blast load and ground stress is basically the same, but the main frequency induced by transient unloading is generally lower than the main frequency of vibration induced by blast load. The vibration induced by transient unloading of ground stress will increase the blasting The low frequency component of vibration energy is an important factor affecting the vibration energy distribution of blasting excavation. Increasing the level of ground stress will increase the amplitude of vibration induced by transient unloading of earth stress, which has no effect on the frequency distribution of energy.