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Explicit dynamics ground stress initialization method and system, medium and computer equipment

An initialization method and dynamic technology, applied in computer equipment, medium, explicit dynamic in-situ stress initialization method, and system field, can solve problems such as time-consuming, result error, complicated and cumbersome parameter setting, etc., and achieve a simplified stress initialization method. , Simple operation, easy to set effect

Active Publication Date: 2021-03-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Through the above analysis, the problems and defects of the existing technology are: the existing initialization method takes a lot of time, and the parameter setting is complicated and cumbersome
[0005] The difficulty in solving the above problems and defects is as follows: In view of the complex process of the traditional stress initialization method, the stress initialization part occupies more than 60% of the entire analysis process, and the requirements for the number of computer cores and memory are high, causing many related projects to directly abandon this method. The stress initialization step, but the analysis directly, the result produces a large error

Method used

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  • Explicit dynamics ground stress initialization method and system, medium and computer equipment
  • Explicit dynamics ground stress initialization method and system, medium and computer equipment
  • Explicit dynamics ground stress initialization method and system, medium and computer equipment

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Embodiment 1

[0052] The present invention is based on the ground stress initialization method of AUTODYN platform, is characterized in that, comprises the following steps:

[0053] (1) Establish numerical models based on actual engineering problems

[0054] First, a simplified numerical model is established according to the actual underground engineering problems, such as the deep tunnel blasting model, etc., and then the corresponding dynamic mechanical parameters are assigned to the model according to the specific geographical environment, including rock density, volume model, dynamic shear modulus and Dynamic Poisson's ratio, etc.;

[0055] (2) Set specific boundary conditions for the numerical model

[0056] The present invention needs to set the transmission boundary condition on the numerical model to simulate the situation of infinite rock mass, and then set the corresponding constant stress boundary condition according to the needs, that is, the stress does not change with time; ...

Embodiment 2

[0060] (1) Establish a deep ground single hole blasting model

[0061] The single hole blasting problem in a deep blasting project is simplified as image 3 In the numerical model shown, its length and width are both 200mm, and the radius of the blast hole is 3.5mm. Considering the geological conditions of granite, the corresponding dynamic mechanical parameters are: the density is 2.66g / cm 3 , the bulk model is 25.59GPa, the dynamic shear modulus is 21.83GPa, and the Poisson's ratio is 0.169. The model is discretized into a total of 164,500 two-dimensional plane strain elements.

[0062] (2) Set specific boundary conditions for the numerical model

[0063] A transmission boundary condition is set around the single-hole blasting model to simulate the situation that the blasthole is in an infinite rock mass, and the constant stress boundary condition considered is the lateral initial pressure P x and vertical initial pressure P y Only 20MPa, such as image 3 shown.

[00...

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Abstract

The invention belongs to the technical field of underground engineering numerical simulation, and discloses an explicit dynamics ground stress initialization method and system, a medium and computer equipment. The explicit dynamics ground stress initialization method comprises the steps: building a numerical model according to an actual underground engineering problem; giving corresponding kineticparameters to the model according to the specific geographical environment; setting specific boundary conditions for the established numerical model; and performing explicit dynamics calculation on the model until the model is stable. According to the method, the stress initialization process is directly integrated into the calculation process of explicit dynamics, so that a traditional stress initialization method is greatly simplified, and operation is easy; setting of materials, boundaries and the like of the model is easy; and finally, the accurate ground stress distribution situation canbe obtained, and a key problem in the field of deep engineering numerical simulation is optimized.

Description

technical field [0001] The invention belongs to the technical field of underground engineering numerical simulation, and in particular relates to an explicit dynamic ground stress initialization method, system, medium and computer equipment. Background technique [0002] At present, deep blasting projects often have problems such as difficult construction and complex geographical conditions. For example, the construction of the Sichuan-Tibet Railway has a very high bridge-to-tunnel ratio along the line, and a large number of tunnels are buried as deep as several kilometers. Before construction, it is necessary to conduct numerical simulation research on related projects. Using numerical simulation technology, we can better understand the characteristics of deep ground construction, and then design a more ideal construction plan. How to apply ground stress accurately and efficiently is a very critical issue when conducting numerical research on deep ground problems. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/14
CPCG06F30/20G06F2119/14G06F2111/10
Inventor 王蒙万端莹朱哲明李萧翰舒赟应鹏
Owner SICHUAN UNIV
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