A simplified three-dimensional displacement discontinuity method for multiple fracture simulations

Wu, Kan; Olson, Jon E.

doi:10.1007/s10704-015-0023-4

Cited by 99 publications

(28 citation statements)

References 23 publications

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“…Olson and Taleghani [29] clarified mechanical interaction between pressurized fractures and examined the simultaneous propagation of multiple hydraulic fracture segments with a boundary element numerical model. Kan Wu and Jon E. Olson [30] proposed a novel and simplified 3D displacement discontinuity method and with it efficiently solve the problem of multiple 3D interacting fracture. M. Vahab and N. Khalili [31] presented a fully coupled hydro-mechanical model on the basis of X-FEM and studied the multizone hydraulic fracturing in saturated deformable porous media using the computational framework.…”

Section: Numerical Analysis Of Water Inrush Evolutionary Processmentioning

confidence: 99%

The Minimum Safe Thickness and Catastrophe Process for Water Inrush of a Karst Tunnel Face with Multi Fractures

et al. 2019

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Water inrush of tunnel face is one of the most common geological disasters during tunnel construction in China. Aiming at the rock mass with multi fractures in water-resistant strata ahead of karst tunnel, the compressive-shear cracking property is analyzed by fracture mechanics theory and the change law of rock bridge shear strength with branch crack propagated length under karst water pressure and geo-stress is studied according to Mohr-Coulomb strength criterion. Moreover, the critical water pressure of water-resistant strata with multi fractures under tension-shear failure is deduced. The safe thickness of water-resistant strata with multi fractures ahead of karst tunnel is established based on two band theory and critical water pressure, and the influence of karst water pressure, initial crack length, crack spacing, array pitch of cracks, lateral pressure coefficient and the angle between the crack and the maximum principal stress on the minimum safe thickness of water-resistant strata are discussed. A 3 Dimension Distinct Element Code (3DEC) considering the fluid-solid coupling effect and structural characteristics of rock mass is adopted to study the catastrophe process and the influence of karst cavity scale on displacement and seepage field in water-resistant rock mass ahead of tunnel in the process of sequential excavation. The numerical simulation results show that: The transition from the single effect of unloading on the extrusion displacement of karst tunnel face to combined action of unloading and karst water pressure occurs with the tunnel face advance; The displacement at each measuring point in water-resistant strata continues to increase in the process of tunnel excavation; The extrusion displacement and water flow velocity in tunnel face suddenly increase when the water inrush pathway is about to form; With the increase of karst cavity size, the minimum thickness of water-resistant strata, the displacement of measuring point and pore pressure of crack increase. The study results provide a reference for early warning and prevention of water inrush in karst tunnel face.

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Section: Numerical Analysis Of Water Inrush Evolutionary Processmentioning

confidence: 99%

The Minimum Safe Thickness and Catastrophe Process for Water Inrush of a Karst Tunnel Face with Multi Fractures

et al. 2019

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“…当裂缝沿垂直于最小主应力多裂缝应力干扰又称为"应力阴影", 是裂缝张开对周围介质产生的附加应力作用 [23] . 水力压裂时, 水力裂缝一般处于黏度主导的扩展阶段, 岩石破裂消耗的能量远小于液体流动摩阻消耗的能量 [19,20] . 因此, 对于i裂缝, 其缝内流体净压力即为流动摩阻p fi .…”

Section: 各簇裂缝入口压力unclassified

Competitive propagation of multi-fractures and their control on multi-clustered fracturing of horizontal wells

et al. 2019

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“…5 However, modeling fluid-driven fracturing processes in porous media is challenging because of its complexity involving solid-fluid interaction and various fracture geometry scenarios. There have been a lot of studies to model the fracturing process by using cohesive (interface) elements, [6][7][8][9] extended finite element method (XFEM)/generalized finite element method (GFEM)/partition of unity method (PUM), 8,[10][11][12] displacement discontinuity methods, [13][14][15][16] peridynamics, 17 and others.…”

Section: Introductionmentioning

confidence: 99%

The effect of stress boundary conditions on fluid‐driven fracture propagation in porous media using a phase‐field modeling approach

Shiozawa

Lee

Wheeler

2019

Num Anal Meth Geomechanics

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Summary A phase‐field approach for fluid‐driven fracture propagation in porous media with varying constant compatible stress boundary conditions is discussed and implemented. Since crack opening displacement, fracture path, and stress values near the fracture are highly dependent on the given boundary conditions, it is crucial to take into account the impact of in situ stresses on fracturing propagation for realistic applications. We illustrate several numerical examples that include the effects of different boundary conditions on the fracture propagation. In addition, an example using realistic boundary conditions from a reservoir simulator is included to show the capabilities of our computational framework.

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A simplified three-dimensional displacement discontinuity method for multiple fracture simulations

Cited by 99 publications

References 23 publications

The Minimum Safe Thickness and Catastrophe Process for Water Inrush of a Karst Tunnel Face with Multi Fractures

The Minimum Safe Thickness and Catastrophe Process for Water Inrush of a Karst Tunnel Face with Multi Fractures

Competitive propagation of multi-fractures and their control on multi-clustered fracturing of horizontal wells

The effect of stress boundary conditions on fluid‐driven fracture propagation in porous media using a phase‐field modeling approach

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