A coupled thermo-hydrologic-mechanical damage model and associated application in a stability analysis on a rock pillar

Li, L.C.; Tang, Chun’an; Wang, Shanyong; Yu, Jin

doi:10.1016/j.tust.2012.10.003

Cited by 78 publications

(42 citation statements)

References 52 publications

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“…Motivated by the experimental observations of Nemat-Nasser and Horii, 20 uniaxial and biaxial compression of specimen containing a number of large preexisting flaws and a row of suitably oriented smaller flaws were numerically simulated by Tang and Kou 21 using the RFPA code. The code was applied to investigate 3-D fracturing processes of cylindrical rock specimens with two macroscopic preexisting flaws by Wang et al 22 Several researchers 15,23,24 have numerically investigated fracture formation from a preexisting fracture, using the RFPA code. The simulated failure mode and uniaxial compression strength of Wang et al 22 are in agreement with the experimental results earlier reported by Yang et al 4 We added to these recent experimental and numerical investigations and simulated the effect of multiple parameters on fracture propagation from a single preexisting flaw including flaw angle, depth, and length.…”

Section: Introductionmentioning

confidence: 99%

Simulating damage evolution and fracture propagation in sandstone containing a preexisting 3‐D surface flaw under uniaxial compression

Mondal

Olsen-Kettle

Gross

2019

Num Anal Meth Geomechanics

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Summary Preexisting flaws and rock heterogeneity have important ramifications on the process of rock fracturing and on rock stability in many applications. Therefore, there is great interest in numerical modelling of rock fracture and the underlying mechanisms. We simulated damage evolution and fracture propagation in sandstone specimens containing a preexisting 3‐D surface flaw under uniaxial compression. We applied the linear elastic damage model based on the unified strength theory following the rock failure process analysis code. However, in contrast to the rock failure process analysis code, we used the finite element method with tetrahedron elements on unstructured meshes. It provided higher geometrical flexibility and allowed for a more accurate representation of the disk‐shaped flaw with various flaw depths, angles, and lengths through locally adapted meshes. The rock heterogeneity was modelled by sampling the initial local Young's modulus from a Weibull distribution over a cubic grid. The values were then interpolated to the computational finite element method mesh. This method introduced an additional length scale for the rock heterogeneity represented by the cell size in the sampling grid. The generation of three typical surface cracking patterns, called wing cracks, anti‐wing cracks, and far‐field cracks, were identified in the simulation results. These depend on the geometry of the preexisting surface flaw. The simulated fracture propagation, coalescence types, and failure modes for the specimens with preexisting surface flaw show good agreement with recent experimental studies.

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Section: Introductionmentioning

confidence: 99%

Simulating damage evolution and fracture propagation in sandstone containing a preexisting 3‐D surface flaw under uniaxial compression

Mondal

Olsen-Kettle

Gross

2019

Num Anal Meth Geomechanics

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“…RFPA-Petrol is suitable for simulation of 3D fracture propagation problems and costs lower computation time. The capabilities of RFPA family simulators related to hydraulic fracturing problems have been verified in multiple studies [35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 93%

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Tang

Rutqvist

et al. 2020

Energies

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Multi-cluster hydraulic fracturing of long-range horizontal wells is an approach for enhancing the productivity of low-permeability shale reservoirs. In this study, RFPA-Petrol (rock failure process analysis on petroleum problems) is applied for modeling hydraulic fracture propagation in multilayered formations. RFPA-Petrol based on coupled hydraulic-mechanical-damage (HMD) modeling was first tested by modeling a laboratory scale experiment on a physical (cement) model with a single completion. The modeling demonstrated the capability of RFPA-Petrol for simulating hydraulic fracture propagation. Then, we used RFPA-Petrol to investigate how the difference in material properties between oil-bearing layers and interlayers and the fracturing fluid properties influence the propagation of dual fractures in multilayered laboratory-scale models. In this case, the models with geological discontinuities in the vertical direction are strongly heterogeneous and RFPA-Petrol simulations successfully modeled the fracture configurations.

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“…In order to analyze the sensitivity of slope stability to the lake water level, the parameter Δ is defined as the weakening degree of the slope under the seepage of lake water, expressed as (4). represents of dry slope and represents of slope containing lake water.…”

Section: Determination Of Minimum Lake-slope Distancementioning

confidence: 99%

“…To rock slopes, this means a great reduction of stability. With the development of the numerical calculation, many modules in kinds of numerical software have been developed to realize the hydromechanical coupling in fractured rock mass [1][2][3][4]. The Itasca software FLAC 3D based on fast Lagrangian method can be used to simulate the flow of fluid through a permeable solid [5], and the pore pressure of the fluid will change in response to the change of mechanical volume.…”

Section: Introductionmentioning

confidence: 99%

Stability Assessment and Optimization Design of Lakeside Open-Pit Slope considering Fluid-Solid Coupling Effect

Fan

Cao

Zhang

et al. 2015

Mathematical Problems in Engineering

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Chengmenshan copper mine, located at Jiujiang city in the Jiangxi Province, is a rarely lakeside open-pit mine in China. Since the open-pit is very close to Sai Lake, the seasonally changed water level and the distance between lake and slope have great influence to the stability of open-pit slope. Based on the drill data and geological sections, a numerical model of the slope is built. With the fluid-mechanical interaction associated, the stability of the slopes is numerically analyzed, in which different lake water levels and lake-slope distances are taken into consideration. The comparative analysis shows that a larger lake-slope distance can promise better slope stability and weaken the sensitivity of slope stability to water. The stability of slopes with different heights is analyzed to find that the stability weakens and the sensitivity is enhanced with the height increasing. To the most serious situation, the slope height and the lake water level being 238 m and 17.2 m, respectively, the value equals 1.18945 which is extremely closed to the allowable safety factor of 1.20 for slope design. According to the minimum for slope design, the minimum distance between lake and open-pit slope is found to be 60 m.

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A coupled thermo-hydrologic-mechanical damage model and associated application in a stability analysis on a rock pillar

Cited by 78 publications

References 52 publications

Simulating damage evolution and fracture propagation in sandstone containing a preexisting 3‐D surface flaw under uniaxial compression

Simulating damage evolution and fracture propagation in sandstone containing a preexisting 3‐D surface flaw under uniaxial compression

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Stability Assessment and Optimization Design of Lakeside Open-Pit Slope considering Fluid-Solid Coupling Effect

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