Abstract
The first part of this paper presents the major drawbacks of the traditional methods for generating joints in Particle Flow Code 2D (PFC2D). Violent oscillations in the postpeak shear stress and shear‐induced dilation in the normal direction occur in specimens generated by directly removing bonds in joints and using the discrete fracture network (DFN) method. The specimens generated by the additional wall method can be used to simulate realistic shear mechanical properties in the direct shear test, but it is difficult to achieve a uniform initial stress distribution within the specimen due to the constraint of particle motion. The second part of this paper explores an improved method to generate realistic joints based on the particle grouping technique and the smooth joint model, and the validity of this method is verified by a set of numerical direct shear tests. The numerical results show that the proposed joint generation method can effectively eliminate the oscillation of the postpeak shear stress and shear‐induced dilation in the normal direction. In addition, the mechanical behaviours of the rough jointed rock mass correspond well with the theoretical results obtained from Patton’s and Barton’s models. The proposed model can also simulate the asperity degradation of rough jointed rock masses.
Highlights
In engineering construction, the material properties of joints are important factors in jointed rock masses [1,2,3,4]
Two of the most widely used empirical formulas based on the roughness of the joint surface are the bilinear strength criterion proposed by Patton [5] and the shear strength empirical expression proposed by Barton and Choubey [7]
Ivars et al [16] describe synthetic rock mass (SRM) modelling and use the bonded particle model for rock to represent intact material and the smooth joint contact model (SJM) to represent the in situ joint network. eir method improves the accuracy of rock mass simulation and greatly expands the application of Particle Flow Code (PFC) in jointed rock mass
Summary
The material properties of joints are important factors in jointed rock masses [1,2,3,4]. Eir method improves the accuracy of rock mass simulation and greatly expands the application of PFC in jointed rock mass By using this software, the interactions of particles are transmitted through virtual contacts and bonds. Numerical results of direct shear tests on rock masses with a horizontally persistent joint have indicated that neither of the two Advances in Materials Science and Engineering methods can reproduce realistic shear properties of joint rock. To solve the above problems, Chiu et al [12] and Chiu et al [22] modelled rock joints by artificially specifying a joint roughness coefficient Their method eliminated the variations in the dilatancy angle, the shear strength still oscillates, and the evolution of shear damage cannot be modelled properly.
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