The Deformation and Failure Analysis of Rock Mass Around Tunnel by Coupling Finite Difference Method and Discrete Element Method

2019 ◽  
Vol 49 (4) ◽  
pp. 421-436
Author(s):  
Feng Huang ◽  
Yi Wang ◽  
Yunbo Wen ◽  
Zhi Lin ◽  
Hehua Zhu
Keyword(s):  
Rock Mass ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Discrete Element Method ◽  
Failure Analysis ◽  
Difference Method ◽  
Discrete Element ◽  
Deformation And Failure ◽  
Element Method

scholarly journals Numerical Investigation of Top Coal Drawing Evolution in Longwall Top Coal Caving by the Coupled Finite Difference Method-Discrete Element Method

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 219
Author(s):  
Yuming Huo ◽  
Defu Zhu ◽  
Zhonglun Wang ◽  
Xuanmin Song
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Discrete Element Method ◽  
Difference Method ◽  
Discrete Element ◽  
Recovery Ratio ◽  
Coal Recovery ◽  
Working Face ◽  
The Common ◽  
Longwall Top Coal Caving

In longwall top coal caving (LTCC), the resource recovery ratio of the working face is directly determined by the top coal recovery ratio. An investigation of the evolution of top coal drawing characteristics and revealing the evolution of top coal drawing parameters is necessary when providing guidance for caving parameter selection and improving the top coal recovery ratio. Based on in-situ measurements of the size distribution of caved top coal blocks in Wangjialing coal mine, a finite difference method (FDM)–discrete element method (DEM) coupled method was applied to establish a “continuous–discontinuous” numerical model and the process from the first coal drawing to the common coal drawing was simulated with 17 separate working face advances. The evolution of the drawing body (DB), loose body (LB), and top coal boundary (TCB) was obtained. The results show that, the evolution of parameters of DB such as shape and size, drawing amount, length and deflection angle of the long axis of the profile ellipsoid tended to decrease first, then increase, decrease again, and finally stabilise; the increment of the LB advance coal wall distance and the coal pillar distance was close to 0 m in the common coal drawing stage, while width increment of the LB was close to the drawing interval (0.865 m). The TCB formed after each coal drawing round was fitted based on the improved “Hook” function. The evolution of height and radius of curvature of TCB’s stagnation point was analysed. This was divided into three stages: the first (first to third drawing rounds) was the initial mining influence stage, the second (fourth to ninth drawing rounds) was the transitional caving stage, and the third (after tenth drawing round) was the common coal drawing stage.

Weighted Finite Difference and Boundary Element Methods Applied to Groundwater Pollution Problems

1991 ◽  
Vol 23 (1-3) ◽  
pp. 517-524
Author(s):  
M. Kanoh ◽  
T. Kuroki ◽  
K. Fujino ◽  
T. Ueda
Keyword(s):  
Boundary Element Method ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Boundary Element ◽  
Difference Method ◽  
Groundwater Pollution ◽  
Small Region ◽  
Boundary Element Methods ◽  
Computational Time ◽  
Element Method

The purpose of the paper is to apply two methods to groundwater pollution in porous media. The methods are the weighted finite difference method and the boundary element method, which were proposed or developed by Kanoh et al. (1986,1988) for advective diffusion problems. Numerical modeling of groundwater pollution is also investigated in this paper. By subdividing the domain into subdomains, the nonlinearity is localized to a small region. Computational time for groundwater pollution problems can be saved by the boundary element method; accurate numerical results can be obtained by the weighted finite difference method. The computational solutions to the problem of seawater intrusion into coastal aquifers are compared with experimental results.

scholarly journals Bolt-Grout Interactions in Elastoplastic Rock Mass Using Coupled FEM-FDM Techniques

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
Debasis Deb ◽  
Kamal C. Das
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Experimental Validation ◽  
Yield Criterion ◽  
Numerical Procedure ◽  
Practical Applications ◽  
Finite Element Procedure

Numerical procedure based on finite element method (FEM) and finite difference method (FDM) for the analysis of bolt-grout interactions are introduced in this paper. The finite element procedure incorporates elasto-plastic concepts with Hoek and Brown yield criterion and has been applied for rock mass. Bolt-grout interactions are evaluated based on finite difference method and are embedded in the elasto-plastic procedures of FEM. The experimental validation of the proposed FEM-FDM procedures and numerical examples of a bolted tunnel are provided to demonstrate the efficacy of the proposed method for practical applications.

A novel green element method by mixing the idea of the finite difference method

2018 ◽  
Vol 95 ◽  
pp. 238-247 ◽  
Author(s):  
Xiang Rao ◽  
Linsong Cheng ◽  
Renyi Cao ◽  
Jun Jiang ◽  
Ning Li ◽  
...  
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Green Element Method ◽  
The Finite Difference Method ◽  
Element Method

GALERKIN FINITE ELEMENT METHOD AND FINITE DIFFERENCE METHOD FOR SOLVING CONVECTIVE NON-LINEAR EQUATION

2010 ◽  
Vol 9 (1-2) ◽  
pp. 69
Author(s):  
E. C. Romão ◽  
M. D. De Campos ◽  
L. F. M. De Moura
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Galerkin Finite Element Method ◽  
Galerkin Finite Element ◽  
Convection Diffusion ◽  
Non Linear ◽  
Element Method

The fast progress has been observed in the development of numerical and analytical techniques for solving convection-diffusion and fluid mechanics problems. Here, a numerical approach, based in Galerkin Finite Element Method with Finite Difference Method is presented for the solution of a class of non-linear transient convection-diffusion problems. Using the analytical solutions and the L2 and L∞ error norms, some applications is carried and valuated with the literature.

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