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Studies on Discrete Fracture Network Modeling Based on Monte-Carlo and Permeability Tensor of Rock Masses

Author: LiuHaiJun
Tutor: LeiWeiDong
School: Harbin Institute of Technology
Course: Civil Engineering
Keywords: Fractured rock Fracture network model Permeability tensor Geometric parameters Permeability
CLC: TU452
Type: Master's thesis
Year: 2011
Downloads: 109
Quote: 0
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Abstract


Rock cracks everywhere in rock engineering strength, deformation and groundwater permeability directly affect the mechanical characteristics of the various rock engineering, design, construction, operation and maintenance of status. Traits and seepage system at home and abroad on the fractured rock system, but not much in the law of the permeability of fractured rock mass as well as the practical application. Relative to other description of the rock mass permeability model, the fracture network model can accurately describe the law of fractured rock mass permeability. In this paper, MATLAB, Monte Carlo method based on the establishment of a fracture network model; model calculated in two different types of boundary conditions, analysis of the geometric parameters of the fissures in fractured rock permeability. (1) by analysis of rock fracture geometric characteristics of random distribution pattern and the basic assumptions of the fracture network model based on the use of stochastic simulation methods, Monte Carlo (Moute Carlo) preparation of a two-dimensional plane random fracture network simulation generated in MATLAB computer program, simulated rock fracture network model. (2) the basic assumptions of the fracture network model based on algorithms derived permeability coefficient of two-dimensional steady seepage under the two different types of boundary conditions. MATLAB powerful matrix calculation function, the calculation procedure of the preparation of the permeability coefficient in these two different types of boundary conditions. Procedures applied to the analysis of the fracture network model, indicating that the calculation procedure can fracture network model analysis, which provides a solid foundation for the specific application and follow-up studies of the fracture network model. (3) departure from the principle of permeability tensor calculation fitting penetration oval in the two-dimensional fracture network system by the permeability coefficient, specific methods of operation to calculate the permeability tensor, and the preparation of the corresponding computer program in MATLAB. (4) Finally, this article fracture network model and its calculation procedure under different boundary conditions, a detailed discussion of the geometric parameters of the rock fracture (occurrence, spacing, or density, trace length and open) on the permeability of the fractured rock the impact of the law. The results show that: in the two-dimensional fracture network model, various geometrical parameters of the fissures affect the permeability of the fractured rock mass. Fissures open on the permeability of the greatest impact, followed by density the smallest trace length, and with the increased density and track length, they increasingly fractured rock mass permeability; occurrence of permeability mainly affects permeability differences in the respective directions.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock mechanical properties and stress theory
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