Recent insights into analytical precision and modelling of DDA and NMM for practical problems

Ohnishi, Yuzo; Sasaki, Takeshi; Koyama, Tomofumi; Hagiwara, I.; Miki, Shigeru; Shimauchi, Testuya

doi:10.1080/17486025.2013.871066

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…However, complex parameter calibrations are needed before simulations. The newly developed discontinuous numerical methods such as NMM (Li et al 2020;Ohnishi et al 2014), Phase Field Method (Spetz et al 2020), PD method (Shou et al 2016;Zhou et al 2022;Zhou et al 2021;Zhou et al 2014) and MPM (Zhang et al 2011) all have wide applications in dealing with tunnel excavation damage, but limitations still exist.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on the excavation damage of Jinping deep tunnels based on the SPH method

Ren

Zhang

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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In order to systematically evaluate the damage degree in Jinping deep tunnels during excavation, an improved SPH algorithm with good Lagrangian characteristics is introduced. By modifying the derivative of the traditional SPH kernel functions, the brittle failure processes of particles are realized. The ‘Fissure Searching Generating Method’ (FSGM) has also been used to determine the establishment of joints and the tunnel excavation parts. Based on the Jinping tunnel engineering practices, numerical models are set up, and the damage degrees of the tunnel excavation under different buried depths, joint distances, positions and inclination angles are numerically simulated, and compared with the engineering site pictures to verify the rationality. (1) Typical “V” shaped shear failure zones are observed when no joints exist in the model, and the damage degree increases with the increasing tunnel buried depth. (2) The increase of joint-tunnel distance causes the damage degree to decrease, and the failure modes between the tunnel and the joint transform from tensile to shear failure. (3) The stability of the tunnel is less affected when the joint appears in the vault, north and south arch shoulder, but the tunnel is prone to becoming unstable when the joint appears in the north and south walls. (4) Steep and gentle dips of the joints greatly influence the excavation stability of the tunnel, while the excavation damage range becomes the smallest when the joint inclination angle is 45°. (5) The improved method can be well applied to predict and evaluate surrounding rock damage in Jinping tunnels.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation on the excavation damage of Jinping deep tunnels based on the SPH method

Ren

Zhang

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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“…e recently new numerical measures such as the Numerical Manifold Method (NMM) [17], the Phase Field Method [18], the Peridynamics (PD) [19], and the Material Point Method (MPM) [20] all have their unique advantages in dealing with failure modeling of tunnel lining, but the limitations also exist. e crack tips cannot be inside the element in the NMM method [21].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Hydraulic Fracturing of Pressure Tunnel Lining Based on the 2P-IKSPH Method

Ren

Zhang

et al. 2021

Mathematical Problems in Engineering

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In order to investigate the fracture mechanisms of the pressure tunnel lining under water-stress coupling, based on the traditional smoothed particle hydrodynamics (SPH) method, the solid-water particle interaction method, and the particle damage conversion algorithm are proposed to realize the hydraulic fracturing process, which is called the 2P-IKSPH method. The “particle domain searching method,” the “birth-and-death particle method,” and the “group discrimination searching method” have also been proposed to realize the simulations of complex processes of excavation, lining, and operation of the hydraulic tunnel. Taking the Guzeng hydraulic tunnel as an engineering example, the hydraulic fracturing of tunnel lining under different conditions is numerically simulated. Results show the following: (1) the 2P-IKSPH method can dynamically reflect the stress wave propagation processes of surrounding rock and the damage process of tunnel lining. (2) The lining damage mainly occurs on the vault and the arch foot. (3) The critical internal water pressure increases with the increase of the tunnel buried depth and the thickness of lining, but increases first and then decreases with the increase of the surrounding rock mass grade. The research results can provide some references for the optimization designs of tunnel lining and reinforcement of similar projects. Meanwhile, developing 3D parallelization program based on 2P-IKSPH will be the future research directions.

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“…However, the DEM has many mesoscopic parameters with no actual physical meanings and requires complex parameter calibrations before numerical simulation, which is inconvenient to apply to engineering practice. The newly proposed discontinuous numerical method such as numerical manifold method (NMM) [18,19], peridynamics (PD) [20,21], and material point method (MPM) [22,23], which all have certain applications in the foundation pit excavation, but also have their limitations: the crack tips of NMM must be on the mesh nodes; the bond-based PD method has some theoretical defects which leads to the Poisson's ratio being constant; the MPM still needs background grids.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Progressive Failure Processes of Foundation Pit Excavation Based on a New Particle Failure Method

Zhu

et al. 2021

Geofluids

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The predictions of failure zone during the foundation excavations will provide important guidance for the safety constructions of engineering structures. Based on this background, the smoothing kernel function in the traditional SPH method has been improved. The failure mark η is introduced into the program to realize the failure characteristics of particles at meso–scale. The “Killing Particle Method” has also been proposed, which can realize the simulations of complex excavation processes. The whole progressive failure processes of the excavation of a foundation pit are numerically simulated and the results show that (1) the failure zone of the excavated foundation pit without retaining walls appears at the corner and then gradually develops into the deep. However, the failure zone of the excavated foundation pit with retaining walls only develops longitudes along the retaining wall. (2) The stiffness of retaining wall has a great impact on the failure zone of foundation pit excavation. The greater the stiffness of retaining wall, the greater the damage degree. (3) The rationality of the proposed method is verified by the comparisons of the simulation results of the proposed method with the ABAQUS numerical examples and the engineering practices. Future research directions should focus on developing the 3D parallel IKSPH programs. The research results can provide some references for the applications of SPH method into predicting the failure zone of foundation pit excavations and ensuring the safety of engineering constructions.

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Recent insights into analytical precision and modelling of DDA and NMM for practical problems

Cited by 13 publications

References 5 publications

Numerical simulation on the excavation damage of Jinping deep tunnels based on the SPH method

Numerical simulation on the excavation damage of Jinping deep tunnels based on the SPH method

Numerical Analysis of the Hydraulic Fracturing of Pressure Tunnel Lining Based on the 2P-IKSPH Method

Numerical Simulation on the Progressive Failure Processes of Foundation Pit Excavation Based on a New Particle Failure Method

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