Safety assessment of buried pressurized gas pipelines subject to blasting vibrations induced by metro foundation pit excavation

Jiang, Nan; Zhu, Bin; He, Xiancong; Zhou, Chuanbo; Luo, Xuedong; Wu, Tingyao

doi:10.1016/j.tust.2020.103448

Cited by 86 publications

(22 citation statements)

References 24 publications

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“…e particle vibration frequencies of 45.25-120.5 Hz at each monitoring point obtained by numerical simulations are slightly higher than those obtained by in situ monitoring points. e main reason for the above phenomenon is that the particle vibration frequencies of the numerical simulations are obtained without considering the attenuation and dissipation of the blasting seismic waves caused by joints and weakening faces in the rock mass [28,29]. In summary, the comparison between numerical simulation and field monitoring data shows that the three-dimensional model and model parameters adequately describe the field data.…”

Section: Numerical Calculations and Verificationmentioning

confidence: 99%

Prediction of Bench Blasting Vibration on Slope and Safety Threshold of Blasting Vibration Velocity to Undercrossing Tunnel

Zhong

Liu

et al. 2021

Shock and Vibration

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The reconstruction and expansion project of oil reserve base often faces the excavation and blasting of the slope and undercrossing tunnel at the same time. Due to the flammable and explosive liquid storage nearby, the tight construction period, and the high requirements of collaborative construction, once the blasting accident occurs, the consequences are unimaginable. To facilitate safe and timely cooperative blasting construction of the slope and undercrossing tunnel, a vibration monitoring test of the slope and tunnel surrounding rock is conducted. The vibration response characteristics of the rock surrounding the slope and tunnel are analyzed, and a mathematical prediction model for the peak particle velocity (PPV) with consideration of the influence of the relative slope gradient (H/D) is established based on dimension analysis theory, which improves the prediction accuracy of PPV at the slope surface. ANSYS/LS-DYNA is used to establish a 3D finite element model for the slope and tunnel, and the dynamic response of the tunnel surrounding rock under blasting load is verified through field monitoring data. A linear statistical relationship between PPV and effective tensile stress (ETS) of the tunnel surrounding rock is established. The PPV safety criterion of the tunnel surrounding rock under blasting load is proposed to be 10 cm/s according to the first strength theory, and hence, the minimum safety distance from the tunnel working face to the slope surface is calculated to be 36 m. Finally, the excavation timing arrangement of the slope and tunnel is proposed, which has been successfully applied to the expansion project, and the construction period has been effectively shortened by 45 days while ensuring construction safety. The research results have great guiding significance to similar cooperative blasting excavation engineering for high slope and adjacent tunnel with safety and efficiency.

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Section: Numerical Calculations and Verificationmentioning

confidence: 99%

Prediction of Bench Blasting Vibration on Slope and Safety Threshold of Blasting Vibration Velocity to Undercrossing Tunnel

Zhong

Liu

et al. 2021

Shock and Vibration

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“…Geologically, soft soil layer is characterized by high natural water content, large pore ratio, high compressibility, low shear strength, and high sensitivity, which makes it an undesirable geological body in constructional engineering [6][7][8][9][10]. e rapid development of China's economics put forward higher and higher requirements for the construction of urban architecture, transportation, and others, and the majority of the engineering construction cannot do without the foundation pit support [11][12][13][14][15]. ere are numerous supporting forms for foundation pit, among which pile-anchor support is the most commonly used [16][17][18][19][20], whereas it plays small role in soft soil layer, because the bonding strength between soft soil and bolt body is low and the bolt can provide low pulling resistance due to the special properties of soft soil, which therefore leads to overlong bolt and dense spacing of bolts in soft soil foundation pit.…”

Section: Introductionmentioning

confidence: 99%

Field Experiment Research of the Polycystic Aeration Bolt: Model Design and Anchorage Mechanism

Peng

Chen

et al. 2021

Advances in Civil Engineering

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As a new type of bolt, the polycystic aeration bolt has a broad application prospect in soft soil area; however, its design and production are still in the stage of constant exploration and improvement. From the perspective of bolt material and engineering cost, the important components of the polycystic aeration bolt were analyzed by combination with the existing bolt models, and a new structural design scheme of a kind of polycystic aeration bolt which can be used in practical engineering was presented in this paper. Then, the stress and failure mode of this bolt were discussed, and the theoretical equation of the bearing capacity was derived by using the elastic-plastic theory. In addition, the assembly and fabrication technology of this bolt in practical foundation pit engineering was described in detail. Finally, the field pull-out test of the polycystic aeration bolt was carried out, and the test results were compared with those of the conventional grouting bolt, which indicated that this new bolt has a greater advantage in bearing capacity than the conventional grouting bolt, verifying the feasibility of the structural design scheme of the polycystic aeration bolt proposed in this paper.

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“…Xia et al [20] calculated the vibration response of buried flexible HDPE pipes under impact loads based on the Winkler model and the Timoshenko beam theory. Recently, Jiang et al [21][22][23] studied the dynamic failure behavior of buried cast iron gas pipeline subjected to blasting vibration. In order to simplify the analysis, most of these studies approximately regard blasting seismic waves as plane waves.…”

Section: Introductionmentioning

confidence: 99%

Random Dynamic Response Characteristics of Pipeline Subjected to Blasting Cylindrical SH Waves

Zhang

2021

Shock and Vibration

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It is essential to investigate the influence of blasting vibrations on pipelines, and the dynamic response is the crux in the safety issues. At present, the blasting seismic wave is usually regarded as a plane wave. However, there is little research about the dynamic response characteristics of underground structures subjected to nonplane waves. The analytical solution to dynamic stress concentration factor (DSCF) of pipelines subjected to cylindrical SH wave was derived. Besides, the randomness of the shear modulus of soil was considered, and the statistical analysis of DSCF was carried out by the Monte Carlo simulation method. Results show that the variability of the shear modulus of soil has a significant influence on the probability distribution of DSCF. The larger the variation coefficient of the shear modulus is, the more obvious the skewness of DSCF is. The influence of low-frequency wave on pipeline increases with the reducing normalized distance r∗, while the influence of high-frequency wave reduces and the variation amplitude of DSCF increases. Compared with the DSCF of pipe subjected to a plane wave, a lower dominant frequency or larger normalized distance for the cylindrical SH wave will generate a more similar statistical characteristic of DSCF.

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Safety assessment of buried pressurized gas pipelines subject to blasting vibrations induced by metro foundation pit excavation

Cited by 86 publications

References 24 publications

Prediction of Bench Blasting Vibration on Slope and Safety Threshold of Blasting Vibration Velocity to Undercrossing Tunnel

Prediction of Bench Blasting Vibration on Slope and Safety Threshold of Blasting Vibration Velocity to Undercrossing Tunnel

Field Experiment Research of the Polycystic Aeration Bolt: Model Design and Anchorage Mechanism

Random Dynamic Response Characteristics of Pipeline Subjected to Blasting Cylindrical SH Waves

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