Volume 39 Issue 5
Oct.  2025
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Huang Xiaoming, Wang Huan, He Yanfang, Zeng Zhuo, Xue Yuyang, Xie Zhuoxiong, Wang Bo. Influence of blasting construction of small spacing tunnel on dynamic response of cavity tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 716-723. doi: 10.20265/j.cnki.issn.1007-2993.2024-0344
Citation: Huang Xiaoming, Wang Huan, He Yanfang, Zeng Zhuo, Xue Yuyang, Xie Zhuoxiong, Wang Bo. Influence of blasting construction of small spacing tunnel on dynamic response of cavity tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 716-723. doi: 10.20265/j.cnki.issn.1007-2993.2024-0344

Influence of blasting construction of small spacing tunnel on dynamic response of cavity tunnel

doi: 10.20265/j.cnki.issn.1007-2993.2024-0344
  • Received Date: 2024-07-24
  • Accepted Date: 2024-10-29
  • Rev Recd Date: 2024-10-24
  • Publish Date: 2025-10-10
  • Based on the reconstruction and expansion project of the existing Danjiashao tunnel, and considering the actual distribution law of the defects after the lining of the existing tunnel, the influence of different distribution positions and sizes of the cavities behind the lining on the response law of structural blasting vibration under various surrounding rock conditions was studied. The results show that the influence of the cavity behind the lining on the vibration response of the existing tunnel lining is different under different distribution positions, various sizes, and surrounding rock conditions. From the analysis of the distribution position of the cavity, the amplification effect of the cavity behind the vault lining on the vibration velocity and stress is greater than that of the arch waist cavity; from the analysis of the distribution size of the cavity, the larger the cavity is, the greater the amplification effect on the vibration velocity is, and the amplification effect on the stress is the opposite. From the analysis of the existence of voids behind the lining under different surrounding rock levels, the worse the surrounding rock (the higher the surrounding rock level), the more significant the amplification effect of the cavity on the vibration velocity and stress. The comprehensive analysis suggests that when the vibration velocity is used as the safety control reference value of the adjacent cavity tunnel during the blasting construction of the new tunnel, the vibration velocity control value at the cavity should be appropriately reduced according to the location, size, and surrounding rock condition of the cavity.

     

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