基于叠加原理的隧道爆破近区振动预测方法

发布时间：2018-05-06 02:20

本文选题：爆炸力学 + 波形叠加　；参考：《爆破》2017年03期

【摘要】：为了改善隧道近区振动强度预测的准确性,基于现场单孔爆破试验,在掌子面后方构建5排×11列的测点阵模型,在考虑震波频率随传播距离衰减的基础上,利用Anderson线性叠加模型来模拟掏槽孔爆破时的振动情况,建立符合现场实际的隧道近区振速计算模型。同时以北京兴延高速公路隧道梯子峪段爆破工程实测振动数据验证模型的可行性,并对隧道近区振速进行预测。研究表明:(1)基于波形叠加的爆破振动预测模型适用于隧道近区振动预测;(2)在平行于掌子面的隧道截面上,在一定范围内爆破地震波能量流动的方向逐渐分散而均匀,在垂直于掌子面的测线上,拱顶处速度衰减折线的斜率绝对值最大,衰减最快;(3)在模型分析区域中,随着到掌子面距离的增加,不同隧道截面上测点对群孔效应敏感性不同,距离掌子面越近,敏感性越大。
[Abstract]:In order to improve the accuracy of the prediction of vibration intensity in the near region of the tunnel, based on the field single hole blasting test, a lattice model of 5 rows 脳 11 rows is constructed behind the palm. The attenuation of the frequency of the seismic wave with the propagation distance is considered. The Anderson linear superposition model is used to simulate the vibration of cutting blasting, and a model for calculating the near region vibration velocity of tunnel is established in accordance with the actual situation in the field. At the same time, the feasibility of the model is verified by the measured vibration data of the Tiaoyu section of Beijing Xingyan Expressway Tunnel, and the near region vibration velocity of the tunnel is forecasted. The results show that the prediction model of blasting vibration based on waveform superposition is suitable for the prediction of tunnel vibration near the tunnel. In the tunnel section parallel to the palm surface, the direction of energy flow of blasting seismic wave is gradually dispersed and uniform in a certain range. On the measuring line perpendicular to the face of the palm, the slope of the velocity attenuation break line at the arch top is the largest, and the attenuation is the fastest. In the model analysis area, with the increase of the distance from the face to the palm, the sensitivity of the measuring points on different tunnel sections to the group hole effect is different. The closer the face to the palm, the greater the sensitivity.
【作者单位】：中国矿业大学力学与建筑工程学院;
【基金】：国家自然科学基金资助项目(10272109) 国家教育部高等学校博士学科点专项基金资助课题(20060290009) 中央高校基本科研业务费专项资金资助项目(2010QL05)
【分类号】：U455.6

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