Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

Zhao, Yuetang; Chen, Cheng; Vafeidis, Anastasios; Li, Jie

doi:10.1155/2017/9152632

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…By comparing the monitoring data in Table 1, it can be seen that the blasting vibration produced by the blasting excavation of Section IV is the largest, which indicates that the smaller the distance between the upper and lower tunnels, the larger the blasting vibration. at is to say, the blasting vibration of the upper and lower crossing tunnels also conforms to the general blasting vibration law that the vibration speed is inversely proportional to the distance between the blast centers [20,21]. e peak velocity of the measurement Point A (that is, the location of the tunnel lining dome) is the largest during the blasting process of each section, which indicates that the blasting excavation has the greatest influence on the vault of the existing tunnel.…”

Section: Vibration Monitoringmentioning

confidence: 90%

Influence of Small, Clear Distance Cross‐Tunnel Blasting Excavation on Existing Tunnel below

Duan

Gong

et al. 2019

Advances in Civil Engineering

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The vibration effect generated during tunnel excavation can influence or damage adjacent tunnels. Studying and controlling the blasting vibration effect has important theoretical and practical significance, especially for new tunnels. This paper takes the tunnel project of Gao Jiu Lu-Jia Hua Cross Tunnel in Chongqing as the research background and assesses the blasting vibration influence in the up-down cross-tunnel. Onsite monitoring and numerical simulation were used to analyze peak particle velocity (PPV) changes, stress distribution, and crown settlement during the excavation process of Gao Jiu Lu I Tunnel at Jia Hua Tunnel Left Line in the cross-section. Influence laws of blasting excavation in a small, clear distance cross-tunnel on an existing tunnel below were obtained. Results show that new tunnel blasting vibrations exerted the largest influence on the crown of the existing tunnel below in the cross-section. The maximum tensile stress of the secondary lining of the existing tunnel below was mainly concentrated in the crown area. The maximum compressive stress during excavation was concentrated in the crown foot, and the stress value was less than the tensile and compressive strength of the concrete. The loosening of the surrounding rock from blasting excavation of the new tunnel caused secondary settlement of the existing tunnel crown below. The cumulative settlement value at the cross-section of the two tunnels was the largest. With an increase in axial distance from the cross-section of the existing tunnel crown, the settlement value gradually declined and became stable. These research results have reference value for the construction of a small, clear distance cross-tunnel and provide theoretical guidance for similar tunnel excavation projects in the future.

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Section: Vibration Monitoringmentioning

confidence: 90%

Influence of Small, Clear Distance Cross‐Tunnel Blasting Excavation on Existing Tunnel below

Duan

Gong

et al. 2019

Advances in Civil Engineering

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“…It was observed that, with an increase in the distance from the source of explosion, the acceleration on the tunnel keeps on decreasing. Zhao et al [57] studied the response of a cylindrical tunnel against a centric point explosion. An expansion and a contraction phase were observed from the vibrations of the cylindrical shell.…”

Section: Influence Of Shape Of Tunnelsmentioning

confidence: 99%

A review on the performance of the underground tunnels against blast loading

Senthil¹,

Sethi²,

Pelecanos³

2021

JSEAM

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The tunneling system has become an important part of the present infrastructure system in all over the world. Therefore, it has become important to ensure the safety of the tunnels against any type of man-made blasting activities or other accidental blasting occurrence. In order to evaluate the performance of the tunnels against blast loading, a detailed review is carried out. Based on the review in the last couple of decades, the various parameters such as tunnel lining materials, tunnel shapes, tunnel lining thickness, tunnel burial depth, charge weight and standoff distance are high influences on the performance of underground tunnels against blast loading. It was observed that the tunnel roof and the tunnel wall center are most vulnerable to the blast loads. Also, it was found that more of the tunnel lining thickness results in lesser deformation at the tunnel roof and the tunnel wall center. The increase in the burial depth of the tunnel would reduce the extent of damage to the tunnel caused by effects of surface blast loading. The stiffness and strength of the ground media may be enhanced against the effects of blast loading by grouting measures. The studies revealed that the lining materials possessing blast waves absorbing properties can be best suited to be used in tunnel linings. Further, it was observed that more damage was caused to the tunnels due to the magnitude of the charge weight. An increase in the blast load causes a significant increase in the fracture area, residual stress and lateral displacement caused to the tunnel by the action of blast load. The standoff distance of the blast load from the tunnel also plays a significant role in the damage of the tunnel. More is the distance between the charge and the tunnel, lesser damage caused to the tunnels. In addition to that, the lining thickness was predicted and the trend was calibrated and fitted logarithmically with the available results. Based on the observation from the literature, it is concluded that the use of a single lining material in the tunnel against blast loading was studied predominantly in the couple of decades. Further, the performance of the tunnels in combination of different tunnel lining materials against blast loading was found limited. The influence of barriers to save the underground tunnels against blast loading was found limited.

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“…More importantly, for shield tunnels in saturated soils, if a large deformation of the structure occurs and a hole is formed, a large amount of silt will then pour into the interior of the tunnel, causing secondary damage and triggering an even greater disaster. It has been reported that in the underground structure in New York City across the Hudson River section due to the long time of construction, a small explosion may cause perforation; if the river water enters into the tunnel, the consequences will be catastrophic [1,2], and many cities, such as London, Paris, Tokyo, and Singapore, in the world underground lines contain sections across the river and many cities in the south of China. The top of the underground tunnels is buried in shallow depths [3,4], which are more dangerous when subjected to external impact loads, such as the Shanghai Chongming Crossing river tunnel at an average depth of 9 m, and the shallowest depth is only 6.8 m [5].…”

Section: Introductionmentioning

confidence: 99%

Response and Damage Characteristics of Segmental Tunnel Lining under Various Dynamic Load Conditions

Chai,

Wang,

Wang

et al. 2024

Advances in Civil Engineering

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This paper investigates segmental lining, developing a numerical model to explore the dynamic interaction between saturated soil and the lining structure, and analyses the effects of the angle of incident load and the wavelength-to-diameter ratio on the displacement, deformation, and distribution of the plastic zone of the structure. The findings demonstrate that the structure experiences vertical compressive deformation during ground shock predominantly. The structure can be categorised into the major deformation region (with an angle within 60° of the vertical direction) and the minor deformation region (with an angle within 30° of the horizontal direction), determined by the structure’s radial deformation. The maximum radial velocity of the nodes in the major deformation area is greater and swifter, whereas the maximum radial velocity of the nodes in the minor deformation region is lesser and mostly equivalent in extent. The maximum radial displacement of the nodes in the major deformation area is highly receptive to the loading wavelength–diameter ratio (L/D) (the ratio of the load wavelength to the structure’s outer diameter) when the wavelength-to-diameter ratio (L/D) is small (1 ≤ L/D ≤ 5). Conversely, the maximum radial displacement in the minor deformation area is considerably sensitive to the wavelength–diameter ratio when 5 ≤ L/D ≤ 30. The total displacement and velocity of the structure remain unaffected by the angle of load incidence. However, it affects the maximum deformation of the structure as well as the location where the maximum node velocity occurs. In addition, the joint surface of the structure experiences the highest plastic strain at an angle of load incidence of 60°.

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Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

Cited by 4 publications

References 16 publications

Influence of Small, Clear Distance Cross‐Tunnel Blasting Excavation on Existing Tunnel below

Influence of Small, Clear Distance Cross‐Tunnel Blasting Excavation on Existing Tunnel below

A review on the performance of the underground tunnels against blast loading

Response and Damage Characteristics of Segmental Tunnel Lining under Various Dynamic Load Conditions

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