Velocity and stress response and damage mechanism of three types pipelines subjected to highway tunnel blasting vibration

Guan, Xiaolan; Zhang, Liang; Wang, Yuwen; Fu, Hongxian; An, Jianyong

doi:10.1016/j.engfailanal.2020.104840

Cited by 33 publications

(7 citation statements)

References 11 publications

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“…For the most representative classical theory of stratum settlement caused by tunnel excavation, peck made regular statistics on a large number of tunnel excavation examples in 1969, put forward that the trend of land settlement deformation is normally distributed [13], and considered that the movement of soil medium leads to soil loss. According to the assumption that the soil is undrained and the volume is incompressible, the volume of normal distribution tank is equal to the volume of…”

Section: Study On Deformation Model Of Flowing Sand Layer Over Pipe J...mentioning

confidence: 99%

Influence of pipe jacking excavation in overlying quicksand layer on surface settlement and numerical analysis

Pan¹,

Huang²,

Cheng³

et al. 2022

HSET

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The cause of quicksand in soil depends on the nature of soil. Under the action of permeability, quicksand is easy to occur when the pore ratio of soil is large, the water content is large, the clay content is small, the silt content is large, the permeability coefficient is small and the drainage performance is poor. Therefore, quicksand phenomenon is easy to occur in fine sand, silt and loam, but whether quicksand phenomenon occurs or not also depends on certain external conditions, that is, the hydrodynamic pressure (permeability) generated by the seepage of groundwater in the soil. When the upward seepage force of unit granular soil is greater than or equal to its own gravity, the soil will suspend and move. In the process of underground engineering construction, if the problem of quicksand is not solved, the structure will displace with the flow of sand layer, which will change the bearing layer of the foundation and do great harm to the structure. This phenomenon should be eliminated. Practice shows that many accidents of underground structures are related to quicksand caused by the change of seepage conditions during construction. The disturbance of soil in pipe jacking construction is the fundamental cause of soil deformation. It destroys the original natural equilibrium state of soil, changes the stress-strain state of soil, and makes the undisturbed soil experience complex stress paths such as extrusion, shear and deformation. In this paper, a numerical model is established to analyze the surface settlement trend of pipe jacking in quicksand covered stratum, and the methods of grouting behind pipe jacking wall and excavation surface stability measures are verified to control the settlement measures in the construction process.

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Section: Study On Deformation Model Of Flowing Sand Layer Over Pipe J...mentioning

confidence: 99%

Influence of pipe jacking excavation in overlying quicksand layer on surface settlement and numerical analysis

Pan¹,

Huang²,

Cheng³

et al. 2022

HSET

View full text Add to dashboard Cite

show abstract

“…They showed that the rate of increase in stress in the pipeline was quite greater than the induced velocity. Moreover, there was no consistency between the peak velocity position and the maximum stress position [14]. Chamanzad et al(2020) work is to investigate the effects of the geomechanical and geometrical parameters of rock and discontinuities on the rock mass blasting using the UDEC software.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Safety and the Effect of Blast Loading on the Shotcrete together with lattice girder Support of Tunnels

Basaligheh

Tabar

Nikkhah

2023

Frattura Ed Integrità Strutturale

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Damage to tunnels caused by explosions may damage the support structure and the stability. This damage is due to either blasting the working face for drilling progress or an explosion inside the tunnel. The present study investigates the dynamic parameters resulting from the blasting pattern on the temporary support structure of the tunnel considered as a lattice girder and shotcrete equivalent cross-section. For this purpose, LS-DYNA finite element software was used to assess the dynamic response of the structure to the vibration of the blasting-induced explosion. The peak particle velocity (PPV) was considered to evaluate the safety of the tunnel under dynamic loads. According to the results of this study, by exceeding the velocity of 0.9 m/s in the elements, some levels of destruction will occur. Regarding the elements of the temporary support structure of the tunnel, it is found that the damage occurs near the face and 2 m from the tunnel.

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“…The non-uniform seismic excitation, similar to blast vibration waves, has a great influence on the acceleration amplification in soil and the strain and displacement of the long deep buried pipeline [19]. In a tunnel affected by blast vibration waves, the dynamic stress of the structure is directly related to the peak vibration velocity (PPV) [20]. Xu [21] and Zhang [22] analyzed the effect of blast vibration waves on the safety of tunnel structures without considering the vibration frequency.…”

Section: Introductionmentioning

confidence: 99%

Study on Dominant Frequency Attenuation of Blasting Vibration for Ultra-Small-Spacing Tunnel

et al. 2022

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The middle rock pillar in ultra-small-spacing tunnels is significantly narrow, and the stability of the primary support and lining are easily influenced by the blasting vibration wave from an adjacent tunnel. Therefore, understanding the vibration frequency characteristics is essential for the blasting vibration control. Based on the blasting works on a double-track roadway tunnel (Jiuwuji tunnel in Guizhou, China), this study investigates the dominant frequency attenuation in the preceding tunnel with the middle rock pillar spacing ranging from 4.0 m to 9.4 m. The results show that the ranges of the dominant frequency distributions on the primary support and lining are widely within 200 Hz, but there are varieties in their propagation laws. The distribution of the dominant frequencies on the primary support is broader than that on the lining; and the dominant frequencies are concentrated on a specific range when the lining is far from the blast face beside a particular value, which is not present on the primary support. As the presence of cavity and changing medium between the lining and the primary support, it made a significant contribution to the filtering the vibration waves. Furthermore, on the primary support, the high-frequency part of the vibration waves attenuates rapidly with distance, and then, the practical prediction equations describing dominant frequency attenuation were proposed. The comparison on frequency characteristics per delay for the millisecond delay blasting shows that multiple delay sequences blast contributes to a multi-structured amplitude spectrum of blast vibration waves; and the varies of the equivalent explosion sources dimensions and numbers of free surfaces in each blast delay resulting in diverse vibration waveforms. Finally, the dominant frequencies determined by different methods were compared, and the results show a nonlinear relationship between the ZCFs and DFs. The above research conclusion expands the understanding of blasting vibration in tunnel engineering, particularly in the frequency distribution.

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Velocity and stress response and damage mechanism of three types pipelines subjected to highway tunnel blasting vibration

Cited by 33 publications

References 11 publications

Influence of pipe jacking excavation in overlying quicksand layer on surface settlement and numerical analysis

Influence of pipe jacking excavation in overlying quicksand layer on surface settlement and numerical analysis

Evaluating the Safety and the Effect of Blast Loading on the Shotcrete together with lattice girder Support of Tunnels

Study on Dominant Frequency Attenuation of Blasting Vibration for Ultra-Small-Spacing Tunnel

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