Influence of joint geometry and roughness on the multiscale shear behaviour of fractured rock mass using particle flow code

Wang, Peitao; Ren, Fenhua; Cai, Meifeng

doi:10.1007/s12517-020-5187-1

Cited by 27 publications

(9 citation statements)

References 37 publications

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“…According to Wang et al [30], the RDFN model considers both the spatial distribution and the geometry of single joint trace, as shown in Figure 2. The DFN model is a discrete fracture model that is based on probability statistical distribution functions and is combined with random seeds and joint density to generate DFN entities that can be used to study two-dimensional [31] or three-dimensional [32,33] rock mass joint models.…”

Section: Rdfn Modellingmentioning

confidence: 99%

“…Wang et al [30] proposed RDFN models and modelling methods based on three different geometric types, including curves, triangular polylines, and fractal fracture network models. However, each RDFN model only enables the construction of a separate geometric representation function.…”

Section: Rdfn Model Based On Fourier Transformmentioning

confidence: 99%

“…However, only relatively few studies have been performed in this field. Wang et al [30] proposed a rough discrete fracture network (RDFN) model based on the roughness of the joint surface (Figure 2). Further, they constructed a sine curve, a triangular polyline, and a fractal fracture network model for indoor tests and numerical simulations based on three different geometric types of RDFN models and modelling methods, ultimately enabling the construction of complex structural surface networks of rock masses.…”

Section: Introductionmentioning

confidence: 99%

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A Rough Discrete Fracture Network Model for Geometrical Modeling of Jointed Rock Masses and the Anisotropic Behaviour

Wang

Cao

et al. 2022

Applied Sciences

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The geometry of the joint determines the mechanical properties of the rock mass and is one of the key factors affecting the failure mode of surrounding rock masses. In this paper, a new rough discrete fractures network (RDFN) characterization method based on the Fourier transform method was proposed. The unified characterization of the complex geometric fracture network was achieved by changing the different Fourier series values, which further improved the characterization method of the RDFN model. A discrete element numerical calculation model of the complex RDFN model was established by combining MATLAB with PFC code. Numerical simulation of the anisotropic mechanical properties was performed for the RDFN model with a complex joint network. Based on the results, the geometry of the joint network has a significant influence on the strength and failure patterns of jointed rock masses. The failure modes of the opening are highly affected by the orientation of the fracture sets. The existence of the rough fracture sets could influence the failure area of different excavation situations. The study findings provide a new characterization method for the RDFN model and a new characterization approach for stability analysis of complex jointed rock masses.

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Section: Rdfn Modellingmentioning

confidence: 99%

Section: Rdfn Model Based On Fourier Transformmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Rough Discrete Fracture Network Model for Geometrical Modeling of Jointed Rock Masses and the Anisotropic Behaviour

Wang

Cao

et al. 2022

Applied Sciences

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“…Only several scholars have considered the influence of joint morphology and conducted direct shear tests. Wang et al [30] and Ma et al [31] studied the effect of joint morphology on shear behavior of joints. Liu and Xia [32] proposed the failure mode of NTJRM.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Influence of Joint Surface Morphology on Strength and Deformation of Nonthrough Jointed Rock Masses under Direct Shear

Liu

Chen

et al. 2021

Advances in Civil Engineering

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Direct shear tests were carried out on nonthrough jointed rock masses (NTJRM) with three types of joints under five normal stresses. The strength characteristics of shear strength, initial crack strength, and residual strength and the deformation characteristics of tangential displacement and dilatancy displacement as well as the transformation of failure mode and the variation of shear parameters of rock mass with different joint morphology are studied. Under the same normal stress, with the increase of joint undulation, the shear strength of NTJRM increases, and the corresponding tangential displacement of NTJRM increases. Two typical failure modes are observed: TTTS mode and TSSS mode. TTTS model indicates that the initial failure, extension failure, and final failure of rock mass are caused by tensile action, while the failure mode of through plane is formed by shear action. The initial failure of TSSS mode rock mass is caused by tensile action, while the expansion and final failure are caused by shear action, and the failure mode of through plane is formed under shear action. When the joint undulation is small and the normal stress is small, NTJRM will fail in TTTS mode; when the joint undulation is large and the normal stress is large, NTJRM will fail in TSSS mode. The results show that the shear parameters of NTJRM are related to the joint morphology, the bond force increases with the increase of joint undulation, and the internal friction angle increases with the increase of joint undulation. The research results of direct shear test of nonthrough jointed rock mass can provide reference for related research.

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“…Moreover, the cost of the physical model test is higher than that of the numerical simulation test. erefore, if the parameters of the simulated material can be determined, many experts and scholars tend to use the numerical simulation test to study the mechanical properties of the incoherent jointed rock mass [22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Research on the Strength Characteristics and Crack Propagation Law of Noncoplanar Nonthrough Jointed Rock Mass by PFC2D

Chen

Liu

Mei

et al. 2021

Advances in Civil Engineering

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In this study, five groups of numerical models with different conditions were established by using PFC2D (particle flow code) to simulate the direct shear tests of noncoplanar nonthrough jointed rock mass. It is proved that normal stress and shear rate, as well as the connectivity rate, relief angle, and inclination angle of joints, have significant influence on the strength characteristics, number of cracks, and the stress of the rock mass according to measurement taken at five different measurement circles in the rock mass. Moreover, it is determined that in the process of shearing, no matter which group of tests are conducted, the number of cracks in the rock mass caused by tension is far more than that caused by the shear action. In other words, the failure of rock mass with different planes and discontinuous joints is mainly caused by the tension in the process of the direct shear test.

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Influence of joint geometry and roughness on the multiscale shear behaviour of fractured rock mass using particle flow code

Cited by 27 publications

References 37 publications

A Rough Discrete Fracture Network Model for Geometrical Modeling of Jointed Rock Masses and the Anisotropic Behaviour

A Rough Discrete Fracture Network Model for Geometrical Modeling of Jointed Rock Masses and the Anisotropic Behaviour

Experimental Study on Influence of Joint Surface Morphology on Strength and Deformation of Nonthrough Jointed Rock Masses under Direct Shear

Research on the Strength Characteristics and Crack Propagation Law of Noncoplanar Nonthrough Jointed Rock Mass by PFC2D

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