A Numerical Modeling Method for Rock Mechanics Considering the Coupling of Macro and Mesoscopic Defects

Abstract

The invention relates to a numerical modeling method of rock mass mechanics considering macroscopic and microscopic defect coupling. The method comprises the following steps of firstly, generation ofa numerical calculation model, wherein an FLAC3D program is adopted for numerical modeling, the planar size, thickness and boundary conditions of the calculation model are set, a three-node triangularunit is adopted for conducting superfine mesh division on the model, during the superfine mesh division, divided mesh units are cubes, and the side length of each cube is not greater than 1 mm; constitutive models and parameters of rock masses or rocky slopes are set, and the numerical calculation model is established; secondly, generation of macroscopic defects; thirdly, generation of microscopic defects. According to the method, the macroscopic defects represent macroscopic joints, cracks and the like, and the microscopic defects represent micro-cracks and the like; by means of the method,the macroscopic and microscopic defects existing in the rock masses are simultaneously considered, and the rock masses obtained through modeling is closer to actual rock masses.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering research, and in particular relates to a numerical modeling method of rock mass mechanics considering the coupling of macroscopic and microcosmic defects. Background technique [0002] Under the influence of long-term and complex geological processes and human engineering activities, natural defects of various scales have formed in the rock mass, such as large to regional faults, medium-scale joint fissures, mesoscopic micro-cracks and micro-cavities, and even microscopic defects on the molecular and atomic scales. The existence of the above-mentioned defects of different scales not only provides crack sources for the further failure of the rock mass, but also the interaction between them has a very important influence on the mechanical properties such as the strength and failure mode of the rock mass. Early researchers usually considered rock mass as a homogeneous isotropic or layered tra...

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Problems solved by technology

Based on FLAC 3D Procedure, Fu et al. (Fu, J.W.; Chen, K.; Zhu, W.S.; Zhang, X.Z.; Li, X.J.: Progressive failure of new modeling material with a single internal crack under biaxial compression and the 3-D numerical simulation. Eng. Fract. Mech.165:140-152(2016)) simulated the propagation process of initial non-penetrating cracks under compressive loads well through ultra-fine grid division and selection of reasonable rock constitutive model, but this process only considered rock The macro-defects such as initial cracks in the rock mass are considered, but the influence of micro-cracks, micro-cavities and other micro-defects in the rock mass on the mechanical properties of the rock mass is not considered.

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