Mechanical response of surrounding rock of tunnels constructed with the TBM and drill-blasting method

Lü, Junfu; Shi, Yanchao; Zhou, Chuangbing

doi:10.1007/s11069-012-0500-2

Cited by 19 publications

(7 citation statements)

References 17 publications

(13 reference statements)

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“…he main methods for rocks excavations are Drill-and-Blast (DB), and Tunnel Boring Machine (TBM) [10,11]. The process of rocks removal is very different in the two mentioned tunnelling methods.…”

Section: General Rocks Excavations Methods Overviewmentioning

confidence: 99%

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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Rocks are frequently host materials for underground structures, particularly for deep Tunnels. Their behavior plays a fundamental role in the overall stability of these structures. In fact, the erection of deep tunnels imposes rocks excavations around the defined routes. These excavations are generally carried out by various methods of which the most used are Drill-and-Blast (DB) and Tunnel Boring Machine (TBM). However, regardless of the tunnelling method used, the impacts such as the perturbation of the initial stress field in rocks and the release of the stored energy are always significant. The impacts produce damage, fractures and deformations which are generally time-dependent and influence the long-term stability of deep tunnels built in rocks. Thus, by considering the aforementioned excavation methods, this paper identifies, reviews and describes the relevant factors generated during and after rock excavations. Interestingly, such factors directly or indirectly influence the long-term stability and therefore the structural integrity of deep rock tunnels. In addition, some recommendations and proposals for future works are presented. This paper can provide useful references in understanding the degradations, damage and fractures generated by tunnelling methods and facilitate suitable actions to ensure long-term stability of deep underground structures.

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Section: General Rocks Excavations Methods Overviewmentioning

confidence: 99%

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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“…Although explosive blasting has been the most widely used rock breaking technique due to the high efficiency and low cost [4,5]. However, during the rock mass excavation of the bench in a complicated environment, it is severely restricted due to the strong blasting hazards [6,7]. Therefore, it is crucial and urgent to develop a novelty excavation method used in the area with harsh conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on ground vibration characteristics induced by liquid CO2 blasting technique in bench excavation

Ruan¹,

Pan²,

Wang³

et al. 2022

J. vibroeng.

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The liquid CO2 phase change fracturing technique has been widely applied in rock engineering for a long time. However, the ground vibration characteristics in bench excavation have not been well demonstrated. In this study, the particle velocities, main frequencies, and displacements of rock induced by liquid CO2 blasting are investigated based on field tests and numerical simulations. Firstly, three field tests of bench excavation using DM83-1.4 type liquid CO2 storage tube were implemented in a specific highway slope project, in which the TC-4850 N vibration monitors were installed at horizontal distances of 4.2 m, 10.6 m, 20.3 m and 32.2 m from the detonation source to detect the rock vibration velocity and frequency. Subsequently, by employing the dynamic finite element program LS-DYNA, a three-dimensional numerical model was established, and then the particle velocities and displacements were analyzed and discussed. The research results indicate that the peak particle velocity (PPV) decays with distance in an exponential pattern, that is, the PPV decays rapidly in the near zone of the blasting source, and it decays more slowly in the far zone. At the position of 20.3 m in the horizontal distance and 15.8 m in elevation, an elevation amplification effect appears with an amplification factor of 1.12. Moreover, the vibration frequency generated by the liquid CO2 phase change fracturing technique is in the range of 0-80 Hz, which is much smaller than that induced by explosive blasting. The main frequency in the near-field of the blasting source is dominated by the radial frequency (Fr), while the vertical frequency (Fv) is dominant in the far-field. The attenuation law of displacement is generally consistent with the vibration velocity, and the difference between radial and tangential displacement increases gradually with distance.

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“…Usually, the subway tunneling is achieved by shield machines [6,7], but due to the turning curvature limitation and geological or economical issues, the drill-and-blasting method has to be adopted [8] in many cases, which will inevitably cause vibration problem on surrounding rock mass and adjacent structures. For existing tunnels near subway tunneling, possible dynamic damage to their lining should be evaluated before any hazard occurs, especially in the mountainous area Southwest China, where drill-and-blasting is more commonly used.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Zhou¹,

Luo²,

Li³

et al. 2017

Shock and Vibration

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In Southwest China, most regions are mountainous, where traditional drill-and-blast method is adopted to excavate relatively harder rocks. However, blasting would cause vibration to adjacent structures and might result in damage or even failure. This paper considers a case where subway tunnel is overlying an existing railway tunnel, while the excavation requires blasting method. Vibration and stress distribution are calculated via Dynamic Finite Element Method (DFEM) for both full-face excavation and CD method. Result shows that vibration induced by CD method is only 28% of that caused by full-face blasting with same distance. Peak vibration is located on the lining facing the blasting source, while peak tensile stress is on the other side of the contour due to the reflection of stress wave on strata boundary. And peak value of tensile stress induced by full-face blasting is capable of causing lining failure; thus full-face blasting is not suggested within 40 m beyond the underlying tunnel axis. However, CD method has shown much advantage, since blasting within 25 m is also considered safe to the underlying tunnel. But when the blasting source is as near as 12 m within the underlying tunnel, the CD method is no longer safe.

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Mechanical response of surrounding rock of tunnels constructed with the TBM and drill-blasting method

Cited by 19 publications

References 17 publications

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Study on ground vibration characteristics induced by liquid CO2 blasting technique in bench excavation

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

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