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Rock material true triaxial test numerical simulation method considering intermediate principal stress effect

A technology of numerical simulation and principal stress, applied in the field of numerical simulation, can solve problems of little practical significance

Active Publication Date: 2017-12-12
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although this criterion can well predict the strength properties of rock-like materials under true triaxial stress conditions, some empirical constants contained in the formula cannot be related to the rock-like material parameters or their inherent properties, so the criterion must It is obtained by inversion and fitting of indoor true triaxial test data, which has little practical significance

Method used

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  • Rock material true triaxial test numerical simulation method considering intermediate principal stress effect
  • Rock material true triaxial test numerical simulation method considering intermediate principal stress effect
  • Rock material true triaxial test numerical simulation method considering intermediate principal stress effect

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Embodiment 1

[0103] See attached figure 1 It can be known from 6 to 6 that, according to the Mogi-Coulomb strength criterion, the derived finite difference incremental iterative calculation format is embedded in the finite difference software FLAC3D to realize the secondary development and application of the Mogi-Coulomb constitutive model in FLAC3D software; The main members of FLAC3D such as: Calculate the stress tensor function Run() function according to the strain increment, which is the most important function in the whole model development process, and it must be called in every cycle and every sub-unit in the FLAC3D unit calculation; among them , program writing mainly includes five parts: ①Description of base class; ②Description of member function; ③Registration of model; ④Information exchange between model and FLAC3D; Please refer to the attached flow chart figure 1 . Specific embodiments of the present invention are published in the monograph "Experimental RockMechanics" publi...

Embodiment 2

[0119] See attached figure 1 , Figure 7 shows that, according to the Mogi-Coulomb strength criterion, the derived finite difference incremental iterative calculation format is embedded in the finite difference software FLAC3D to realize the secondary development and application of the Mogi-Coulomb constitutive model in FLAC3D software . The specific implementation of the present invention is based on biaxial compression (in fact also a kind of true triaxial stress condition, namely another minimum principal stress σ 3 is 0, the purpose is to better reflect the influence of the intermediate principal stress on the failure mode of the sample) Miluo granite sample failure mode is taken as an example, the specific steps are as follows:

[0120] (1) Establish a three-dimensional numerical model of cuboid rock samples

[0121] A hexahedral mesh numerical model was established for the Miluo granite sample. The size of the sample is 5cm×5cm×5cm, the number of grids and nodes in the...

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Abstract

The invention relates to the field of numerical simulation technology and discloses a rock material true triaxial test numerical simulation method considering an intermediate principal stress effect to truly reflect strength characteristics and failure modes of rock materials under a true triaxial stress condition. The method comprises the steps that a finite difference increment iterative computing format based on Mogi-Coulomb failure criteria is subjected to secondary development in FLAC3D numerical simulation software, and a Mogi-Coulomb constitutive model is obtained; and a numerical model of the rock materials under the true triaxial stress condition is established, basic physical mechanical parameters are assigned to the numerical model, and the Mogi-Coulomb constitutive model is loaded and called to perform simulation operation to obtain a corresponding numerical simulation computing result. According to the method, influences of intermediate principal stress on rock strength and the failure modes are fully considered during numerical analysis of the failure characteristics of the rock materials under the true triaxial stress condition, so that the simulation result is truer and more reliable.

Description

technical field [0001] The invention relates to the technical field of numerical simulation, in particular to a numerical simulation method for true triaxial test of rock materials considering the effect of intermediate principal stress. Background technique [0002] In deep mining engineering or tunnel engineering, under high ground stress conditions, the surrounding rock of underground engineering is in a three-dimensional stress state before excavation, and the principal stresses in the three directions are different. At this time, we call the rock in a true triaxial stress state. Many domestic and foreign scholars have used various methods to study rock strength criteria and failure modes under true triaxial stress conditions, and have achieved fruitful results. Laboratory test is considered to be an intuitive and reliable method, and has been widely used in rock mechanics and rock engineering. Because conventional triaxial tests cannot consider the influence of interme...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 冯帆李夕兵李地元贾马尔·罗斯塔米杜坤彭定潇
Owner CENT SOUTH UNIV
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