2017
DOI: 10.1155/2017/8628671
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Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Abstract: 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… Show more

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Cited by 9 publications
(7 citation 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%
“…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%
“…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%
“…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%