A method and system for building a fractured rock creep model under the action of water-rock coupling

A water-rock coupling and creep technology, applied in the field of rock mechanics engineering, can solve problems such as difficult to realize water-rock coupling, rock creep without cracks and its constitutive model research, and achieve good creep evolution process and good creep Trends, effects with clear physical and mechanical meaning

Active Publication Date: 2022-07-08
四川水发勘测设计研究有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, because it is difficult to achieve true water-rock coupling in laboratory tests, there is no effective research on cracked rock creep and its constitutive model under the action of water-rock coupling in the prior art.

Method used

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  • A method and system for building a fractured rock creep model under the action of water-rock coupling
  • A method and system for building a fractured rock creep model under the action of water-rock coupling
  • A method and system for building a fractured rock creep model under the action of water-rock coupling

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Embodiment 1

[0085] This embodiment provides a method for building a fractured rock creep model under the action of water-rock coupling, such as figure 1 shown, including the following steps:

[0086] S101. Construct a creep equation in which the viscosity coefficient is affected by water pressure and time and a nonlinear creep equation considering the influence of damage according to the operation instruction.

[0087] In the specific implementation, considering that the influence of water pressure on the internal structure of the material is represented by the viscosity coefficient η in the creep equation, a power-law equation is introduced to nonlinearize it. Since the viscosity coefficient η is mainly affected by the water pressure p and time t, a function of η with respect to p and t can be established, namely:

[0088]

[0089] where p is the water pressure, t is the creep time, and A, m and n are the fitted creep parameters.

[0090] In a linear viscoelastic there is ( Charac...

Embodiment 2

[0148] This embodiment provides the verification process of the fractured rock creep model under the action of water-rock coupling. In order to realize the water-rock coupling in the true sense, the YSL-200 rock rheological test system can be used in the test, and the fractured marble sample is placed in the real In the water environment, the joint loading of water pressure and axial pressure is carried out. Rock creep tests often use two loading methods, single-stage and graded. Considering the limitations of experimental conditions, many scholars use graded loading methods to study rock creep characteristics.

[0149] According to the test results, based on the proposed fracture rock creep model under the action of water-rock coupling, parameter identification and fitting analysis were carried out on the following two groups of marble creep test curves: (1) water pressure 0.5MPa; (2) water pressure 1.5MPa. The corresponding fitting curve is as Figure 4 Among them, sub-pict...

Embodiment 3

[0156] This embodiment provides a system for building a fractured rock creep model under the action of water-rock coupling, such as Figure 7 shown, including:

[0157] The construction unit is used to construct the creep equation whose viscosity coefficient is affected by water pressure and time and the nonlinear creep equation considering the damage effect according to the operation instruction;

[0158] The first generation unit is used for substituting the creep equation whose viscosity coefficient is affected by water pressure and time into the preset Nishihara model to generate a nonlinear creep model considering the influence of water pressure;

[0159] The second generation unit is used for substituting the nonlinear creep equation considering the influence of damage into the nonlinear creep model considering the influence of water pressure to generate the creep model of fractured rock under the action of water-rock coupling;

[0160] The calling unit is used for stor...

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Abstract

The invention relates to the technical field of rock mechanics engineering, in particular to a method and system for constructing a fracture rock creep model under the action of water-rock coupling. The method includes constructing the creep equation with the viscosity coefficient affected by water pressure and time and the nonlinear creep equation considering the damage effect according to the operation instructions; substituting the creep equation with the viscosity coefficient affected by the water pressure and time into the preset Nishihara model , generate a nonlinear creep model considering the influence of water pressure; substitute the nonlinear creep equation considering the influence of damage into the nonlinear creep model considering the influence of water pressure, and generate a fracture rock creep model under the action of water-rock coupling. The invention obtains a unified function expression through the established model, describes the fracture rock creep process considering hydraulic pressure, initial damage, damage correction coefficient and damage evolution, and can be applied to long-term stability analysis of corresponding projects.

Description

technical field [0001] The invention relates to the technical field of rock mechanics engineering, in particular to a method and system for constructing a fracture rock creep model under the action of water-rock coupling. Background technique [0002] Rock creep, as an important deformation characteristic of rock, has an important influence on the stability of engineering buildings under long-term load. The rock creep constitutive model is an important part of creep research, and it is the key theory to study the deformation and instability of geotechnical engineering under the action of long-term stable load. At present, most scholars mainly focus on the creep model of intact rock. However, in engineering practice, the geological structure is complex, and the interlayer fractured rock located in the transition zone between the fault and the intact rock is often the most easily overlooked, and only a few Scholars analyze the creep characteristics of joints or fractured rock...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/14Y02E10/20
Inventor 陈英李智渊向勇钟鸿李楠郭艳徐浩白瑞
Owner 四川水发勘测设计研究有限公司
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