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

Zhou, Jie; Luo, Yi; Li, Xinping; Guo, Yong; Liu, Tingting

doi:10.1155/2017/8628671

Cited by 9 publications

(7 citation statements)

References 31 publications

(35 reference statements)

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“…The measures to control the influence of TBM tunnel adjacent construction can be divided into active control measures and passive control measures (Hua, 2008). Passive control countermeasures are taken from the perspective of protecting existing tunnels, including changing construction parameters such as tunnelling speed, jack thrust, grouting time, and shield posture (Zhang, 2018), as well as multiple construction parts, short footage, and precision blasting (Zhou et al, 2017), isolation of impacts and other measures. Active control measures are taken to reduce the disturbance of surrounding rock caused by tunnelling, including surrounding rock grouting (Liu et al, 2022), compensation grouting (Gan et al, 2022), and stratum reinforcement.…”

Section: Plane Model Of Lateral Effectmentioning

confidence: 99%

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Li²,

Chen³

et al. 2023

Front. Earth Sci.

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To study the risk and control countermeasures of the TBM tunnel construction adjacent to the operational railway tunnel, based on the TBM tunnel project of Chongqing Rail Transit Line 5, this paper first evaluates the quality health degree of the operational tunnel lining (OTL) structure according to the on-site structural inspection. Then, the displacement, internal force, and proximity influence scope influenced by the metro TBM tunnel construction are studied using numerical simulation. Finally, the corresponding control countermeasures are proposed. The results show that: (1) The adjacent construction of the upper TBM tunnel will lead to the uplift deformation trend of the lower operational tunnel, and the uplift deformation of the vault is greater than that of the ballast bed. The influence scope is roughly a parallelogram, with the long axis parallel to the operational tunnel and the short axis parallel to the new TBM subway tunnel. (2) TBM tunnelling over the operational tunnel will cause the transformation of the mechanical mode of the OTL structure from the small eccentric compression mode to the large eccentric compression mode. The OTL structure between the left and right lines of TBM is unfavorable. (3) The longitudinal curve of the bending moment and axial force of the OTL fluctuates greatly within the influence range. The bending moment and axial force are reduced in operational tunnel construction joints. Based on field evaluation and numerical analysis, this paper puts forward some risk control countermeasures, such as TBM tunnelling parameters control, pea-gravel backfilling, backfill grouting, and bottom grouting, which can effectively solve the risk of the operational tunnel structure in the adjacent construction. This study has important reference value for risk control and safety assessment of tunnel in complex adjacent tunnel construction.

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Section: Plane Model Of Lateral Effectmentioning

confidence: 99%

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Li²,

Chen³

et al. 2023

Front. Earth Sci.

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“…The method of centralized coupling charge is used to simplify the structure of the blasthole in the model, instead of multi-stage millisecond blasting in actual construction (Zhou et al, 2017(Zhou et al, , 2018. According to the relevant literature (Fang et al, 2010), the blasting vibration of the cut hole with centralized charging is the most harmful.…”

Section: Numerical Modelmentioning

confidence: 99%

“…With the rapid development of computer technology, many scholars began to use numerical simulation methods for related research (e.g. Li et al, 2015;Liang et al, 2013;Xu et al, 2013;Zhong et al, 2013;Zhou et al, 2017). Shin et al (2011) used MIDAS/GTS software to establish a finite element model of existing tunnels under adjacent blasting.…”

Section: Introductionmentioning

confidence: 99%

Influence of tunnel blasting construction on adjacent highway tunnel: A case study in Wuhan, China

Liu

Jiang

Sun

et al. 2019

International Journal of Protective Structures

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In the blasting construction of new tunnels adjacent to existing tunnels, it is important to properly evaluate and control the influence of blasting vibration. In this study, the peak particle velocity of the lining structure of the Huanglongshan highway tunnel (i.e. the existing tunnel) in Wuhan, China, which was adjacent to a tunnel under construction by blasting, was monitored and analyzed. The numerical model of the existing tunnel was established by the dynamic finite element software LS-DYNA, and the reliability of the model and parameter selections were verified based on the field monitoring data. The relationship between peak particle velocity and effective tensile stress of the tunnel lining structure was proposed based on the combination of measured peak particle velocity, dynamic stress distribution characteristics, and numerical simulations under different blasting conditions. Based on the maximum tensile stress criterion and considering the dynamic tensile strength increase factor of lining material, the safety threshold of peak particle velocity for existing tunnel lining structure and the maximum charge weight for new tunnel blasting were suggested.

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“…e size of the model was 50 m in length and width, and the depth from the surface to the bottom of the model was 87.5 m. e four sides of the model limited the horizontal displacement along the normal area to the surface, the bottom limited the displacement in both vertical and horizontal directions, and the top boundary was a free surface. Nonreflective boundary conditions (no reflected waves are generated when seismic waves pass through the boundaries of the model) were applied on the four sides of the model and the ground [22][23][24], see Figure 10(b) for model meshing details. e model included three parts: stratum, tunnel spray mixing, and tunnel secondary lining.…”

Section: Models and Boundarymentioning

confidence: 99%

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

Cited by 9 publications

References 31 publications

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Influence of tunnel blasting construction on adjacent highway tunnel: A case study in Wuhan, China

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

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