As the shield section passes through the silt-rock strata, the rock stratum of the tunnel section has to be blasted into blocks in advance, and the diameter of the blocks should be less than 30 cm after breaking, and then, the blocks could smoothly enter the soil cabin through the opening of the tunnel boring machine (TBM) cutter head and finally be discharged through the screw machine. The geology of rock blasting in silt-rock strata is complex, and the vibrations caused by blasting threaten the safety of buildings around the blasting area. According to the measured data of blasting vibrations at the sites, the waveform duration of vibration acceleration and the distribution characteristics of dominant frequency of vibration velocity were analyzed, the energy characteristics of vibration velocity were researched by wavelet analysis, and the attenuation laws of vibration velocity were studied by dimensional analysis (DA). The dominant frequency bands of vibration energy of ground are in the range of 0–15.625 Hz, and the distribution characteristics of frequency bands of vibration energy in different directions of the ground are similar to each other, but the energy magnitude is different from each other. The research results could provide a reference for the safe blasting distance of buildings under similar geological conditions.

中文翻译：

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粉砂岩地层岩石爆破地面振动特性

由于盾构段穿过粉砂岩地层，隧道段岩层需提前爆破成块，破碎后块体直径应小于30cm，块体才能顺利通过通过隧道掘进机（TBM）刀盘的开口进入土舱，最后通过螺旋机排出。粉砂岩地层岩石爆破地质复杂，爆破产生的振动威胁着爆破区周围建筑物的安全。根据现场爆破振动实测数据，分析了振动加速度的波形持续时间和振动速度主频分布特征，通过小波分析研究了振动速度的能量特性，并通过量纲分析(DA)研究了振动速度的衰减规律。地面振动能量的主导频段在0～15.625Hz范围内，地面不同方向的振动能量频段分布特征相似，但能量大小不同. 研究结果可为类似地质条件下建筑物的安全爆破距离提供参考。但能量大小彼此不同。研究结果可为类似地质条件下建筑物的安全爆破距离提供参考。但能量大小彼此不同。研究结果可为类似地质条件下建筑物的安全爆破距离提供参考。