Method for calculating dynamic stress of circular cavern under directional blasting loads

A technology of directional blasting and dynamic stress, applied in calculation, computer-aided design, special data processing applications, etc., can solve problems such as there is no very good method

Inactive Publication Date: 2018-06-22
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
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Problems solved by technology

However, at present, there is no very good method for calculating the dynamic stress of circular caverns under directional transient loads, which are only determined through numerical simulation and on-site testing.

Method used

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  • Method for calculating dynamic stress of circular cavern under directional blasting loads
  • Method for calculating dynamic stress of circular cavern under directional blasting loads
  • Method for calculating dynamic stress of circular cavern under directional blasting loads

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Embodiment Construction

[0083] The process flow of the method for calculating the dynamic stress of the circular cavity under the transient blasting load in the present invention is as follows: figure 1 shown.

[0084] The steps of calculating the dynamic stress method of circular cavity under transient blasting load are as follows:

[0085] (1) Establish the elastic stress-strain relationship of the circular cavity;

[0086] (2) Deriving the motion equation of the displacement of the rock mass medium;

[0087] (3) Laplace transform is carried out to equilibrium equation;

[0088] (4) The displacement potential function is introduced to solve the governing equation of the rock mass;

[0089] (5) Using boundary conditions to solve the undetermined coefficients of the displacement potential function;

[0090] (6) Substituting the undetermined coefficient back into the equation;

[0091] (7) Obtain the stress and displacement inside the cavern.

[0092] In this embodiment, the surface of a cylind...

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Abstract

The invention relates to a method for calculating dynamic stress of a circular cavern under directional blasting loads. The method includes the following steps of simplifying a cylindrical cavern intoa plane strain problem, establishing a polar coordinate system, and establishing a relationship between the strain and stress of the circular cavern according to a classical elastic mechanics theory;re-deriving a motion equation to enable the loads to change along with theta; introducing a displacement potential function to solve a governing equation, and obtaining the relationship among the potential function and the dynamic stress and displacement; using boundary conditions for solving undetermined coefficients, and substituting the undetermined coefficients into a dynamic stress equationto determine the dynamic stress of the circular cavern under the directional blasting loads.

Description

technical field [0001] The invention relates to a method for calculating the dynamic stress of a circular cavern under directional blasting load, belonging to the technical field of blasting mechanics. Background technique [0002] With the increasing application of directional blasting in practical engineering, the deformation of structures and dynamic stress caused by directional transient loads have gradually become a very concerned issue in the field of engineering and construction. Directional blasting is widely used in various complex projects because it has little impact on structures and can apply transient loads at local locations, causing structures to be destroyed under human controllable conditions. However, at present, there is no very good method for calculating the dynamic stress of circular caverns under directional transient loads, which are only determined through numerical simulation and field testing. Contents of the invention [0003] The object of th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/00G06F2119/06
Inventor 陶彪耿大新胡文韬于洋黄龙华曾罗兰王俊刘豆
Owner EAST CHINA JIAOTONG UNIVERSITY
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