A cross-river tunnel excavation considering the water pressure effect based on DEM

Zhang, Zhihua; Zhang, Xiedong; Shi, Shuyan; Liang, Zhongmin

doi:10.1080/19648189.2019.1615555

Cited by 7 publications

(5 citation statements)

References 44 publications

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“…(3) e pile is modeled by using a clump [33] that has strong stiffness and strength, and the deformation and stress of the pile to be pulled under the load are not considered during the pulling process. (4) e lateral earth pressure increases with the depth because the wall in the model is a rigid surface and the height of the model is 40 m. e average pressure is used to calculate the lateral pressure in the model [8]. (5) e limitations of the 2D DEM have been highlighted, which are due to the neglect of the momentum transfer in the lateral direction [49].…”

Section: Model Hypothesesmentioning

confidence: 99%

“…Gu et al [53] analyzed the particle-size effect in numerical simulation and found that the particle scale effect could be possibly avoided when the ratio of the sample size to the mean particle size is larger than 11.5. Referring to Zhang et al [8], the particle size is set to be 0.06-0.10 m in the pile-pulling model to increase the time efficiency, and the ratio of the sample size to the mean particle size is approximately 500 which is larger than 11.5. erefore, the input microparameters for the pilepulling numerical simulation are shown in Figure 2. Shock and Vibration…”

Section: Microparameter Calibration Of Soilmentioning

confidence: 99%

“…Step 2: the servomechanism was used to compact the particles and to realize a design compressive stress of 1 kPa in the box [8].…”

Section: Whole Modelmentioning

confidence: 99%

“…For axially loaded piles, various methods have been used, including field tests [1][2][3] and laboratory tests [4][5][6][7]. For the field tests, Zhang et al [8] examined the influence of the press pile on material strength, which can have positive impact on mobilizing the shaft resistance [9]. Comparing field tests with laboratory tests, the field tests are rather complicated and the laboratory tests are relatively simple.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Sun

Zhang

Yang

et al. 2020

Shock and Vibration

Self Cite

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When bridge construction has been completed, the temporary support system, such as a steel-pipe pile, is dismantled, and problems that are related to the steel-pipe piles pulling from the strata are encountered. It is difficult to measure the dynamic characteristics of the surroundings during the deep pile-pulling process. A numerical model of the pulling pile is established by using the discrete element method (DEM). A sinusoidal dynamic load is executed on the pile with various vibrational frequencies. The stress, bond, coordination number, porosity, and velocity field distribution of the surrounding soil during the pile-pulling process are studied. The results demonstrate that, during the pile-pulling process, the shearing state of the surrounding soil depends on the position of the pile. The number and area of bond fractures gradually increase, the coordination number decreases, and the porosity gradually increases when the pile-pulling distance increases. Under a vibrational load, the area that corresponds to particles with large velocity and displacement expands with the increase of the vibrational frequency. The major influence zone of the pile pulling on both sides is concentrated within 6dpile, which can be used to evaluate the safety of the existing bridge nearby during pile pulling.

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Section: Model Hypothesesmentioning

confidence: 99%

Section: Microparameter Calibration Of Soilmentioning

confidence: 99%

“…Step 2: the servomechanism was used to compact the particles and to realize a design compressive stress of 1 kPa in the box [8].…”

Section: Whole Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Sun

Zhang

Yang

et al. 2020

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

show abstract

“…To overcome the drawbacks of these methods, a discrete element method (DEM) is now widely adopted to employ the recent rapid advances in computing power in simulating tunnelling [16][17][18][19]. With a number of discrete elements (e.g., particles, clumps, and blocks) whose motion follows Newton's second law and is calculated by an explicit time-stepping scheme, DEM can simulate the behavior of a granular and discrete medium like soil and rock in geotechnical engineering [20,21].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of EPB Shield Tunnelling with TBM Operational Condition Control Using Coupled DEM–FDM

Lee

Choi

et al. 2021

Applied Sciences

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This study demonstrates a three-dimensional numerical simulation of earth pressure balance (EPB) shield tunnelling using a coupled discrete element method (DEM) and a finite difference method (FDM). The analysis adopted the actual size of a spoke-type EPB shield tunnel boring machine (TBM) consisting of a cutter head with cutting tools, working chamber, screw conveyor, and shield. For the coupled model to reproduce the in situ ground condition, the ground formation was generated partially using the DEM (for the limited domain influenced by excavation), with the rest of the domain being composed of FDM grids. In the DEM domain, contact parameters of particles were calibrated via a series of large-scale triaxial test analyses. The model simulated tunnelling as the TBM operational conditions were controlled. The penetration rate and the rotational speed of the screw conveyor were automatically adjusted as the TBM advanced to prevent the generation of excessive or insufficient torque, thrust force, or chamber pressure. Accordingly, these parameters were maintained consistently around their set operational ranges during excavation. The simulation results show that the proposed numerical model based on DEM–FDM coupling could reasonably simulate EPB driving while considering the TBM operational conditions.

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TBM Tunneling Hazards Identification and Mitigation Methods Through Subterranean Rivers: An Evaluation of Nowsud Tunnel in the Iran

Taherian¹

2022

Geotech Geol Eng

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A cross-river tunnel excavation considering the water pressure effect based on DEM

Cited by 7 publications

References 44 publications

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Numerical Simulation of EPB Shield Tunnelling with TBM Operational Condition Control Using Coupled DEM–FDM

TBM Tunneling Hazards Identification and Mitigation Methods Through Subterranean Rivers: An Evaluation of Nowsud Tunnel in the Iran

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