Abstract
The numerical techniques for modelling the rock fracture have been briefly reviewed. A hybrid finite-discrete element method (HFDEM) is proposed to simulate various fracture types of rock. A fracture model is implemented in the HFDEM for simulation of the three main fracture types. In addition, the influence of the strain rate is considered during the HFDEM modelling rock behavior. Then, two typical rock mechanism tests are employed to calibrate the HFDEM. The proposed method has well modelled the rock fracture processes and can obtain reasonable stress distribution and force–displacement curves. After that, the HFDEM is used to model three convention bending tests. The obtained rock fracture processes indicates that the HFDEM can simulate various fracture types. The obtained rock strengths and fracture toughness indicate that the HFDEM can reflect the influence of the strain rate. It is concluded that the HFDEM can model the entire and complete rock fracture process during the three convention bending tests, and it also can capture the rock’s behavior on the strain rate.
Highlights
Rock fracture behavior has been widely studied, especially under a variety of loading conditions
The rock materials can be considered as continuum, such as finite element method, while it can be regarded as a discontinuum, such as the discrete element method
Since Cundall [2] proposed the distinct element method (DEM) and implemented it widely into the investigate rock fracture and resultant fragmentation process [3], discontinuumbased methods have been extensively used in various rock failure problems [4,5]
Summary
Rock fracture behavior has been widely studied, especially under a variety of loading conditions. Since Cundall [2] proposed the distinct element method (DEM) and implemented it widely into the investigate rock fracture and resultant fragmentation process [3], discontinuumbased methods have been extensively used in various rock failure problems [4,5]. The UDEC and 3DEC might be the most common used DEM code [10] for modelling the rock fracture and result fragmentation process. It should be noted that the combined or hybrid continuum–discontinuum methods are different from the coupled combined or hybrid continuum–discontinuum methods The former can freely model the continuum and discontinuum behaviours of rocks and their transitions, while the latter adopts a physical boundary to couple the two methods. FEM/DEM method, and many extensions of the Y-code have been well implemented in rock fracture and fragmentation modelling [17]. The HFDEM is used to simulate three convention point bending tests to obtain various fracture modes
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