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New method for building rock creep constitutive model on basis of variable fractional derivative

A fractional derivative and constitutive model technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the fractional model cannot reflect the rock creep curve, etc., and achieve huge engineering application value and economic benefits. , Accurate judgment and prediction, the effect of reducing engineering losses

Inactive Publication Date: 2014-07-23
SICHUAN UNIV
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Problems solved by technology

However, the common fractional-order models are often difficult to reflect the creep curve of the whole process of rock, especially in the nonlinear accelerated creep stage.

Method used

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  • New method for building rock creep constitutive model on basis of variable fractional derivative
  • New method for building rock creep constitutive model on basis of variable fractional derivative
  • New method for building rock creep constitutive model on basis of variable fractional derivative

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0039] Figure 7 It is a flow chart of the method of the present invention. A new method for building a rock creep constitutive model based on variable fractional derivatives, which includes the following steps:

[0040] Step 1: set up the variable fractional derivative creep model: suppose that the fractional order in the fractional creep model is a function of time, and set up the variable fractional derivative creep model;

[0041] Step 2: Obtain experimental data: obtain the creep data of the accelerated creep characteristics of the rock through laboratory tests, and then draw the creep rate curve according to the creep experimental data, and find out the moment when the rock enters the accelerated creep stage from the curve;

[0042] Step 3: Parameter fitting: According to the moment when the rock enters the accelerated creep stage, the variab...

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Abstract

The invention discloses a new method for building a rock creep constitutive model on the basis of a variable fractional derivative. The method comprises the following steps of building a variable-fractional-derivative creep model, obtaining experimental data and carrying out parameter fitting. A whole-process creep curve, especially non-linear acceleration creep features, can be described on the basis of the model built through the method. The variable fractional derivative can fully reflect the feature that the properties of rock will change along with time in the creep process, the rock creep constitutive model built through the variable fractional derivative is simpler and more effective, acceleration deformation of a rock mass can be accurately judged and predicted, reasonable protective measures are taken, engineering loss is reduced, and huge engineering application value and economic benefit are achieved.

Description

Technical field: [0001] The invention belongs to the technical field of rock engineering, and in particular relates to a new method for establishing a rock creep constitutive model based on variable fractional derivatives. Background technique: [0002] Rock creep refers to the process of continuous growth and development of rock mass deformation over time under the continuous action of constant stress. [0003] The creep performance of rock is an important factor to determine the long-term stability of engineering surrounding rock. For example, the rheology of soft rock often causes natural disasters such as rock landslides, foundation instability, dam foundation cracks, and pillar rockbursts. The rock creep constitutive model can accurately judge and predict the deformation of rock mass, and make reasonable protective measures. Therefore, the research on the rock creep constitutive model is an indispensable and important content of large-scale rock engineering, and its i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 吴斐谢和平吴国成刘建锋
Owner SICHUAN UNIV
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