隧洞开挖爆破空气超压诱发围岩振动机理

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摘要基于河北丰宁抽水蓄能电站地质探洞中爆破试验获取的监测数据，理论分析和数值模拟研究了隧洞开挖爆破空气冲击波超压诱发围岩振动的机理及特性。结果表明，小断面隧洞爆破空气冲击波超压较大并将诱发围岩振动，该振动具有振速高、持续时间长和衰减慢等特征。空气冲击波超压诱发的围岩受迫振动发生时间受空气冲击波传播速度控制。诱发振动可分为空气冲击波超压作用于前部围岩产生并经围岩传播过来的振动，和空气冲击波超压传播到围岩壁面直接引起的振动。数值模拟发现受迫振动经围岩传播时衰减很快，所以测点的振动主要是由于空气冲击波超压直接作用于洞壁造成的围岩振动。

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	陈明1
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	何文学1
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	卢文波1
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	王高辉1
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	郭天阳1
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	冷振东1
	2

关键词 ：钻孔爆破, 隧洞, 振动速度, 空气冲击波超压

Abstract：On the basis of monitoring in the blasting test of Feng-ning Pumped Storage Power Station, the air overpressure induced vibration of surrounding rock during tunnel blasting excavation is studied in theory and numerical simulation. Air overpressure generated during blasting excavation in narrow-bore tunnel is large enough to cause the vibration of surrounding rock, which was characterized by high peak particle vibration velocity (PPV), long duration and slow attenuation. The arrival time of air overpressure induced vibration is determined by the propagating velocity of air shock wave. There are two kinds of air overpressure induced vibration at a certain point, the first is the arrival of the air overpressure induced vibration acting on the surrounding rock of front tunnel, the latter is caused by the air overpressure direct acting on the measurement point. The numerical study reveals that vibration attenuates very quickly when propagating in rock, so the vibration waveform recorded in site experiment is mainly air overpressure induced vibration by directly acting on the tunnel surrounding rock.

Key words： drill and blast tunnel vibration velocity air overpressure

收稿日期: 2015-11-13 出版日期: 2017-06-15

引用本文:

陈明1,2，何文学1,2，卢文波1,2，王高辉1,2，郭天阳1,2，冷振东1,2. 隧洞开挖爆破空气超压诱发围岩振动机理[J]. 振动与冲击, 2017, 36(12): 12-17.
CHEN Ming1,2, HE Wen-xue1,2, LU Wen-bo1,2, WANG Gao-hui1,2, GUO Tian-yang1,2, LENG Zhen-dong1,2. Studies on the vibration of tunnel surrounding rock induced by air overpressure. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(12): 12-17.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I12/12

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