地应力瞬态卸载诱发振动的能量分布特性

doi:10.13722/j.cnki.jrme.2015.0080

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摘要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。

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关键词 ：岩石力学, 深部岩体, 爆破振动, 瞬态卸载, 能量分布, 功率谱

Abstract：The vibration induced by the transient unloading of in-situ stresses(ISTU) is an important part of the eventual excavating vibration during the tunnel blasting excavation. In order to reveal the energy distribution characteristics of vibration induced by ISTU and its influence on the energy distribution of eventual excavating vibration，the energy distribution characteristics of vibration induced by ISTU under different in-situ stress levels and blasting loads were studied with the method of power spectrum analysis. The results showed that the frequency-band energy distribution of vibration induced by ISTU and blasting load were basically identical，but the main frequency of vibration induced by ISTU was lower than that induced by blasting load. The vibration induced by transient unloading of in-situ stresses was an influential factor，and it increased the low frequency component of vibration energy. The increase of in-situ stress level raised the vibration amplitude induced by ISTU and did not affect the frequency-band energy distribution.

Key words： rock mechanics deep rockmass blasting vibration transient unloading energy distribution power spectrum

引用本文:

赵振国1，2，严鹏1，3，卢文波1，3，陈明1，3，周创兵1，3. 地应力瞬态卸载诱发振动的能量分布特性[J]. 岩石力学与工程学报, 2016, 35(1): 32-39.
ZHAO Zhenguo1，2，YAN Peng1，3，LU Wenbo1，3，CHEN Ming1，3，ZHOU Chuangbing1，3. Energy distribution of vibration induced by transient unloading of in-situ stresses. , 2016, 35(1): 32-39.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0080 或 http://www.rockmech.org/CN/Y2016/V35/I1/32

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