Method for describing formation of microscopic fractures and microfractures of rock mass under action of external load

Abstract

The invention relates to a method for describing formation of microscopic fractures and microfractures of a rock mass under the action of an external load. The method comprises the following steps: acquiring data among microscopic rock particles according to acquired rock parameters; establishing a bonding model according to the obtained data, and simplifying the particles into circles; establishing a constitutive relationship of the kettle sticking element based on the fractional order; establishing a Kelvin model according to the constitutive relation, and initializing model parameters; and obtaining an elastic modulus adjusted by the kelvin model, and establishing a Maxwll model formed by connecting a spring element and a kettle sticking element in series. According to the method, the constitutive relation between the microscopic particles and the fractional order model is established, 3D model software is used for carrying out 360-degree dead-corner-free information collection on the rock, it is ensured that each crack and each bend angle of the rock are input by a computer, the information serves as training data of the model, and due to the fact that the real situation of the rock is considered, the simulation result is closer to the reality.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas exploitation, and in particular relates to a method for describing the microscopic cracking and microcrack formation of rock mass under the action of external load. Background technique [0002] There are complex and changeable structures with different shapes and scales inside the rock. The interaction between the various structures causes a large number of micro and macro cracks to be generated inside. The macro cracks are a collection of many micro cracks. The stress concentration at the ends of many cracks is the main reason for rock cracking and rock disintegration and damage. However, when solving rock problems, the existing methods still set the rock as an ideal regular rock mass, without considering its deformation and potential cracks, and most of them use Poisson distribution when describing rocks, without considering the volume, etc. The results of model constitutive relati...

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Problems solved by technology

However, when solving rock problems, the existing methods still set the rock as an ideal regular rock mass, without considering its deformation and potential cracks, and most of them use Poisson distribution when describing rocks, without considering the volume, etc. Variable factors, the model constitutive relationship and other results obtained by analyzing on this basis will produce great errors

[0003] Through the above analysis, the existing problems and defects of the existing technology are: the existing methods do not consider the deformation and potential cracks, and most of them use Poisson distribution when describing rocks, and do not consider variable factors such as volume. Obtained model constitutive relations and other results will produce huge errors

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