Effects of Adjacent Blast Operation on Vibration Behavior of Existing Tunnel

Hisatake, Masayasu; Sakurai, Shunsuke; Ito, Tsuyohito

doi:10.2208/jscej1969.1983.332_67

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Many scholars have conducted a lot of research on the effects of blasting vibration in new tunnels close to existing buildings (structures). Japanese scholar Hisatake et al [4] proposed that the maximum damage stress point in tunnel blasting is related to the distance from the blast source, and obtained the conclusion that the vibration speed on the blast-face side is the maximum; Nakano et al [5] studied the relationship between lining concrete cracking and blasting grade through eld tests. Ramulu et al [6] studied the dynamic response of tunnel structures with different cross-sectional forms under the action of blasting seismic waves.…”

Section: Introductionmentioning

confidence: 99%

Study on the safety criterion of blasting vibration in adjacent tunnels under hard rock strata based on energy principle

ZHANG

YAN

Liu

et al. 2022

Preprint

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This study addresses the contradiction between the strict requirements of vibration speed control in existing operating tunnels and the difficulties of tunnel excavation in hard rock strata, as well as the lack of theoretical basis for blasting vibration speed control standards in adjacent tunnels. Based on the energy principle, this study establishes the energy balance equation in a single cycle of the low frequency band of blasting vibration wave curve, and proposes to replace the maximum elastic strain energy accumulated in concrete by twice the kinetic energy corresponding to the peak vibration speed under blasting action (the "Twice the Peak Kinetic Energy Method") according to the conversion relationship between the input energy of concrete mass unit and the elastic strain energy and kinetic energy. On the basis of this method, the formulae of safe vibration velocity of blasting in two states were derived by combining the energy criteria corresponding to the damage and destruction states of concrete. It is verified in a new tunnel under existing operating railway section in hard rock stratum in Xiamen area. The results show that the maximum principal stress and displacement reach the maximum value in the cycle when the peak vibration speed decays close to zero for the first time in the low frequency band; the elastic strain energy also reaches the maximum value in the cycle when the kinetic energy decays close to zero; affected by a small amount of dissipation energy, the kinetic energy corresponding to the peak vibration speed is slightly less than twice the maximum elastic strain energy, which verifies the reasonableness of the theoretical analysis. Finally, the safe vibration speed corresponding to different concrete grades is given based on the design value of tensile strength.

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Section: Introductionmentioning

confidence: 99%

Study on the safety criterion of blasting vibration in adjacent tunnels under hard rock strata based on energy principle

ZHANG

YAN

Liu

et al. 2022

Preprint

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“…The damage of concrete lining in the EST under blasting load has been studied by lots of researchers. For example, Hisatake et al [1] have researched a dynamic method with respect to effects of adjacent blast operation on vibration behavior of the EST. Krajeinovie [2] has introduced the damage acoustic wave of surrounding rock and obtained an important result that damage cracking of surrounding rock can be expressed by change rate of acoustic wave in rock masses.…”

Section: Introductionmentioning

confidence: 99%

Case Study on Influence of Step Blast-Excavation on Support Systems of Existing Service Tunnel with Small Interval

Sun

Yue

et al. 2013

Advances in Mechanical Engineering

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During the construction of newly built tunnel (NBT) adjacent to the existing service tunnel (EST), stability of the EST with small interval is affected by vibration waves which are caused by blasting load. The support structures of the EST will be cracked and damaged, while the unreasonable blast-excavation methods are adopted. Presently, the studies on behavior of support structure in the EST under blasting load are not totally clear, especially for the bolts system. Besides, the responses of support structure on blasting load are lacking comprehensive research. In this paper, New Zuofang tunnel is taken as a study case to study the influence of step blast-excavation in NBT on support structures of the EST through field experiment and numerical simulation. Some data, such as blasting vibration velocity (BVV) and frequency of support structures, are obtained through field measurement. Based on these data, the formula of BVVs is obtained. Research on stability of tunnel support structures affected by step blast-excavation is conducted using numerical simulation method. The dynamic-plastic constitutive model is adopted in the software ABAQUS to assess safety of support structures. The range and degree of damage for the support structures are obtained. In addition, change laws of axial force and stress with time for the bolts are analyzed.

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Implantation of bubble garnets

Gérard

1984

Thin Solid Films

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Effects of Adjacent Blast Operation on Vibration Behavior of Existing Tunnel

Cited by 4 publications

References 7 publications

Study on the safety criterion of blasting vibration in adjacent tunnels under hard rock strata based on energy principle

Study on the safety criterion of blasting vibration in adjacent tunnels under hard rock strata based on energy principle

Case Study on Influence of Step Blast-Excavation on Support Systems of Existing Service Tunnel with Small Interval

Implantation of bubble garnets

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