Effects of the earth fissure on the seismic response characteristics of nearby metro stations and tunnels

As a widespread geological hazard, the disaster development process of earth ssures is irreversible and di cult to control, which seriously affects the construction and safe operation of engineering facilities. However, few clear conclusions and special regulations have been given regarding the in uence of earth ssures on the dynamic response characteristics of a site and earthquake prevention and disaster reduction measures. Therefore, the microtremor was used instead of earthquake motions to reveal the dynamic response of a site with ssures. The earth ssures in the Taiyuan Basin, which exhibit a large amount of activity, were used as examples. In order to reveal the dynamic response from several aspects, four methods, including the Fourier spectrum, the horizontal-to-vertical spectral ratio (HVSR), the response acceleration, and the Arias intensity, were employed. The results show that the spectrum peaks increase sharply at an earth ssure and return to a stable value approximately 20-25 m away from the ssure, indicating that the earth ssures have an ampli cation effect on the dynamic response of the site.Additionally, a greater ampli cation occurs on the hanging wall of the earth ssure. The in uence range of the dynamic response of site can be divided into four areas. Suggestions on the seismic forti cation intensity and setback distances were also proposed. The ampli cation mechanism was summarized as the coupling of the changes in the soil properties caused by earth ssure activity, the catadioptric effect of the earth ssure interface, and the multiple ampli cations caused by secondary ssures.

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The dynamic amplification effect of a site with earth fissures: a case study in the Taiyuan Basin, China

Chang

Deng

Cao

et al. 2023

J Seismol

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Experimental study on dynamic interaction between ground fissure and diagonal three-section subway tunnels

Liu,

Ren,

Peng

et al. 2024

Front. Earth Sci.

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Ground fissures, as a typical geohazard, pose potential georisks to the construction and maintenance of urban transportation infrastructure. Under the influence of ground fissures, the segmented tunnel structure used in subway systems complicates the propagation of subway train vibrations. In this study, the soil acceleration, earth pressure and contact pressure of a three-section subway tunnel under dynamic loading of a subway train in a ground fissure environment were observed and analyzed by physical modeling tests, and the effects of the presence and activity of the ground fissure and tunnel segmentation were discussed. The results show that the vibration generated by the subway traveling will have different degrees of attenuation when propagating in all directions in the soil layer, and the ground fissure has a damping effect on the subway vibration. The attenuation and enhancement of acceleration by ground fissure is affected by the activity and propagation direction of ground fissure. The distribution of additional earth pressure is affected by the ground fissure, soil contact state, which is related to the ground fissure activity state. The ground fissure activity on the contact additional pressure mainly focuses on the bottom and top of the tunnel and there are differences in the location of the hanging wall and footwall. Three-section tunnels have a stronger vibration response and vibration attenuation than monolithic tunnels due to the influence of segmentation. Based on the consideration of the effects of ground fissure and tunnel segmentation, the tunnel design mainly takes into account the amount of ground fissure activity and determines the structural measures, the tunnel structure at the location of the ground fissure is strengthened, in addition to the vibration attenuation measures for the segmented tunnels when crossing the ground fissure. The discussion of mechanical response and design measures in this study helps to reduce the georisk of ground fissures on urban underground transportation infrastructure.

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Performance of Strengthened Accelerated Oscillator Damper for Vibration Control of Bridges

Zhao,

Tan,

Sun

et al. 2024

Applied Sciences

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Vibration control has emerged as a significant concern in civil engineering, aiming to minimize the displacement and stress exerted on structures during seismic events. The accelerated oscillator damper (AOD), which is a damping device that depends on acceleration, has been demonstrated to be highly effective. However, in the case of traditional bridges, it is difficult to accurately place the secondary mass, spring, and damping components at the piers. Additionally, it has been found that as a general single-degree-of-freedom (SDOF) damping device, a significant limitation of the AOD system is its insufficient damping effect in the near-resonance region. This study presents a strengthened AOD with a liner spring (SAOD-LS), in which the secondary spring and damper are linked to the primary structure rather than being attached to the piers. This design not only provides enough space for the secondary system but also has a higher amplification factor of secondary spring and damping components compared with the original layout. In addition, we suggest a nonlinear spring device (NSD) that includes connecting rods and inclined linear springs arranged in a diamond configuration. This innovative design is intended to introduce nonlinear stiffness characteristics into the equivalent stiffness, thereby improving the device’s performance and providing effective anti-resonance features in the near-resonance region. We have confirmed the motion equations for the SAOD-LS and used finite element (FE) analysis to validate the formulation of the equivalent external force and deformation of the NSD. We have thoroughly investigated both the SAOD-LS and the strengthened AOD equipped with NSD as the secondary spring (SAOD-NSD) for their potential implementation in a bridge project. These damping systems demonstrate exceptional performance and robustness, making them highly suitable for enhancing structural resistance to seismic activity.

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Effects of the earth fissure on the seismic response characteristics of nearby metro stations and tunnels

Cited by 3 publications

References 55 publications

The dynamic amplification effect of a site with earth fissures: a case study in the Taiyuan Basin, China

The dynamic amplification effect of a site with earth fissures: a case study in the Taiyuan Basin, China

Experimental study on dynamic interaction between ground fissure and diagonal three-section subway tunnels

Performance of Strengthened Accelerated Oscillator Damper for Vibration Control of Bridges

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