Discrete element model for performance analysis of cutterhead excavation system of EPB machine

Wu, Li; Guan, Tianmin; Lei, Lei

doi:10.1016/j.tust.2013.03.003

Cited by 53 publications

(16 citation statements)

References 9 publications

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“…Compared with the experimental and theoretical analyses, the numerical simulation method has the advantages of cost-effectiveness, use in complex geological environment and complex working conditions, simultaneous observation of excavation surface and surface deformation, and easy analysis [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…erefore, based on the Huojin shield section of Chengdu Metro Line 18, the particle flow discrete element of the software FLAC3D6.0 is coupled with the finite difference FLAC3D unit, based on the displacement and stress transfer [16][17][18][19][20] and the noncontinuous sand and gravel stratum. e study on the stability of the excavation face reveals the instability mode, surface subsidence law, and minimum support pressure of the collapse and failure of the shield excavation face and compares it with the onsite monitoring data to verify the collapse of the excavation face (research on the universal law of stability influence).…”

Section: Introductionmentioning

confidence: 99%

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Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Jun-wei

Huang

Taixin

2019

Advances in Civil Engineering

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The objective of this work was to study the minimum support force of the shield excavation face of sand-gravel stratum. Based on the geological conditions obtained from the exploration of the 18th line of the Chengdu Rail Transit and the shield excavation parameters obtained from excavation, particle flow DEM PFC3D and FLAC3D were used as tools; the digital triaxial compression test was performed to calibrate the mesoscopic parameters of the soil; numerical excavation models were built for deep-buried and shallow-buried sand and gravel stratum shield tunnels; surface settlement and minimum support force under different depths and different supporting forces were obtained in the end. The stability of the excavation face under the condition of 10 kPa∼60 kPa support force was analyzed; the excavation surface gradually tended to stabilize, and the surface subsidence decreased with the increase of support force. When the supporting force was greater than or equal to 3 kPa, the excavation surface was stable and the surface settlement speed gradually decreased to zero with time. While analyzing the stability of the excavation face of 5 m, 10 m, and 15 m buried deep gravel tunnels and the influence of the support force on the surface settlement, the minimum support force that did not consider the surface settlement was reduced and the minimum support force required to control the surface settlement was increased as the tunnel depth decreased. Using this method, the depth of the excavation sand-gravel tunnel and the support of the excavation face could be obtained to meet the requirements of surface subsidence control and the economic benefits of the project could be improved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Jun-wei

Huang

Taixin

2019

Advances in Civil Engineering

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“…Lambrughi et al, (2012) developed a 3D numerical model using the software FLAC3D to simulate the overall process of excavation and construction of an EPB shield tunnel with the emphasis on the reasonable constitutive equation of soil [5]. Wu et al (2013) presented a 3D model for cutterhead excavation system of an EPB machine with the discrete element method software PFC3D, and the measured system performance parameters indicating stability of excavation face, soil discharging rate, cutterhead system torque and cutter wear were in accordance with the in-situ data [6]. Katushin et al (2013) briefly explained the importance and gave the insight on laboratory wear testing of the drag bit materials for tunneling machines [7].…”

Section: Introductionmentioning

confidence: 99%

Cutterhead and Cutting Tools Configurations in Coarse Grain Soils

Li¹,

Yuan²,

Huang³

2017

TOBCTJ

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Background:Many subway/metro tunnels were constructed using close face shield machines in coarse grain soils in last decades. Configurations of the shield cutterhead and cutting tools are critical in terms of cost and project duration. There are currently no recognized methodologies available for the configurations due to the various geological and technical influencing factors. Several aspects have been considered in many single case studies. Objective and Method:To aid a better understanding for the involved design and operational aspects in a system way, main physical and mechanical characteristics of the coarse grain soils encountered in China are briefly summarized; advantages and disadvantages of the spoke type and plate type cutterhead equipped with corresponding cutting tools are outlined; performances of the different shield cutterheads used in the typical subway construction cases are introduced. Results:Based on the jobsite experiences, discussed are the options with respect to design of the cutterhead and cutting tools in the coarse grain soils, including opening ratio of the cutterhead, configuration of the cutting tools, use of the single disc cutters with inserts, reasonable movement of shield machine, robust shield machines against wears and interventions for changing tools. Conclusion:According to the discussions, the rule-of-thumb suggestions are presented to provide references for later similar projects.

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“…Considering the TBM geometry, a comprehensive nite element analysis (FEA) was performed to simulate the TBM tunnel, and the results were veri ed by comparing with the monitoring results. The FEA model can simulate the excavation ground, mechanical structure, and excavation process on the site (Hasanpour et al 2017;Liu et al 2020;Wu et al 2013). The torque and thrust of the boring machine are the two main design parameters of the shield TBM.…”

mentioning

confidence: 99%

Mechanical aspects of construction of new TBM tunnel under existing structures

Zhang

et al. 2021

Preprint

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It is inevitable for the construction of subways to pass under the existing structures in the city; this will cause settlement of the existing structures and affect their safety. The soil is a complex mixture, and hence it is difficult to determine the damage caused by construction using tunnel boring machine (TBM) method to the stress balance of the surrounding soil. Normally, settlement and uplift of the surface are caused during tunneling. Therefore, large-scale 3D simulations are needed to study the interaction between mechanically driven tunnel construction and the surrounding soil to estimate the expected settlement and related damage risks to the existing structures, especially in tunnel construction in urban areas. Qingdao Metro Line 1 in the Haixiao section (Xiaocunzhuang and Haiboqiao stations) was taken up as the research object to study the trend and degree of the effect of TBM tunnel construction using the numerical simulation software Midas GTS NX. The numerical simulation results and measured data were used for the reliability analysis to study the influence of different digging speeds and pressures in TBM construction on ground subsidence, and the effect of vibrations generated at the tunnel face by the TBM cutter head on the ground structure. It is shown that when other factors remain unchanged, the faster the driving speed, the smaller the ground settlement; the higher the surrounding rock pressure, the smaller the ground settlement. The vibration of the ground structure caused by the TBM cutter head complies with the relevant specifications. During construction, the driving parameters should be selected suitably depending on the available budget.

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Discrete element model for performance analysis of cutterhead excavation system of EPB machine

Cited by 53 publications

References 9 publications

Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Cutterhead and Cutting Tools Configurations in Coarse Grain Soils

Mechanical aspects of construction of new TBM tunnel under existing structures

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