Geomechanics and Engineering

  • 제15권2호
  • /
  • Pages.745-754
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  • 2018
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Determination of equivalent blasting load considering millisecond delay effect

  • Song, Zhan-Ping (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Li, Shi-Hao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wang, Jun-Bao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Sun, Zhi-Yuan (Chinese Railway Bridge Engineering Bureau Group Co. Ltd.) ;
  • Liu, Jing (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Chang, Yu-Zhen (School of Civil Engineering, Xi'an University of Architecture and Technology)
  • 투고 : 2017.08.07
  • 심사 : 2017.11.29
  • 발행 : 2018.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

In the analysis of the effects of rock tunnel blasting vibration on adjacent existing buildings, the model of simplified equivalent load produces higher calculation result of vibration, due to the lack of consideration of the millisecond delay effect. This paper, based on the static force equivalence principle of blasting load, proposes a new determination method of equivalent load of blasting vibration. The proposed method, based on the elastic-static force equivalence principle of stress wave, equals the blasting loads of several single blastholes in the same section of millisecond blasting to the triangle blasting load curve of the exploded equivalent elastic boundary surface. According to the attenuation law of stress wave, the attenuated equivalent triangle blasting load curve of the equivalent elastic boundary is applied on the tunnel excavation contour surface, obtaining the final applied equivalent load. Taking the millisecond delay time of different sections into account, the time-history curve of equivalent load of the whole section applied on the tunnel excavation contour surface can be obtained. Based on Sailing Tunnel with small spacing on Sanmenxia-Xichuan Expressway, an analysis on the blasting vibration response of the later and early stages of the tunnel construction is carried out through numerical simulation using the proposed equivalent load model considering millisecond delay effect and the simplified equivalent triangle load curve model respectively. The analysis of the numerical results comparing with the field monitoring ones shows that the calculation results obtained from the proposed equivalent load model are closer to the measured ones and more feasible.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Education Department of Shaanxi Provincial

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피인용 문헌

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  2. A New Method for Predicting Ground Settlement Induced by Pipe Jacking Construction vol.2020, pp.None, 2018, https://doi.org/10.1155/2020/1681347
  3. A Theoretical Calculation Method of Influence Radius of Settlement Based on the Slices Method in Tunnel Construction vol.2020, pp.None, 2020, https://doi.org/10.1155/2020/5804823
  4. Frequency Spectrum and Wavelet Packet Analyses of Blasting Vibration Signals for Different Charge Structures in Blasting Peripheral Holes vol.2020, pp.None, 2020, https://doi.org/10.1155/2020/8897441
  5. Dynamic stability analysis of rock tunnels subjected to impact loading with varying UCS vol.24, pp.6, 2018, https://doi.org/10.12989/gae.2021.24.6.505
  6. Investigation of blasting impact on limestone of varying quality using FEA vol.25, pp.2, 2018, https://doi.org/10.12989/gae.2021.25.2.111