Abstract
The initiation, propagation, coalescence and failure mode of brittle jointed rock mass influenced by fissure water pressure have always been studied as a hot issue in the society of rock mechanics and engineering. In order to analyze the damage evolution process of jointed rock mass under fracture water pressure, a novel numerical model on the basis of secondary development in fast Lagrangian analysis of continua (FLAC3D) is proposed to simulate the fracture development of jointed rock mass under fracture water pressure. To validate the feasibility of this numerical model, the failure process of a numerical specimen under uniaxial compression containing pre-existing fissures is simulated and compared with the results obtained from the lab experiments, and they are found to be in good agreement. Meanwhile, the propagation of cracks, variations of stress and strain, peak strength and crack initiation principles are further analyzed. It is concluded that the fissure water has a significant reducing effect on the strength and stability of the jointed rock mass.
Highlights
To a great extent, it is the nearly ubiquitous presence of fractures that makes the mechanical behavior of rock masses different from that of most engineering materials
To simulate the fissure development of jointed rock mass under fissure water pressure, we propose a novel numerical model on the basis of secondary development in Lagrangian analysis of continua (FLAC3D) [20], which is an explicit finite difference method (FDM)
The hydro-mechanical coupling of jointed rock mass is realized by the stress equilibrium equation and the continuous seepage equation
Summary
It is the nearly ubiquitous presence of fractures that makes the mechanical behavior of rock masses different from that of most engineering materials. Tang et al [8] developed some numerical methods to simulate the initiation and coalescence of flaws in rock-like materials, including the finite element method (FEM), boundary element method (BEM) and displacement discontinuity method (DDM), and. Tang [9] proposed a new numerical code named RFPA2D (Rock Failure Process Analysis) to simulate the propagation and coalescence of cracks in a rock bridge area. To simulate the fissure development of jointed rock mass under fissure water pressure, we propose a novel numerical model on the basis of secondary development in Lagrangian analysis of continua (FLAC3D) [20], which is an explicit finite difference method (FDM). The numerical model is used to study the fissure development of rock specimens
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