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A method for calculating deformation and stress of tunnel under non-uniform explosion load

An explosive load, non-uniform technology, applied in the direction of calculation, complex mathematical operations, special data processing applications, etc.

Active Publication Date: 2018-12-28
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to establish a method for calculating the deformation and stress of the tunnel under the action of the non-uniform blast load in view of the problems existing in the calculation of the internal force of the existing circular tunnel under the non-uniform blast load

Method used

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  • A method for calculating deformation and stress of tunnel under non-uniform explosion load
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  • A method for calculating deformation and stress of tunnel under non-uniform explosion load

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Embodiment Construction

[0069] The specific embodiment of the present invention is as figure 1 shown.

[0070] Such as figure 1 , this embodiment is a method for calculating tunnel deformation and stress under the action of non-uniform blast load, which is implemented according to the following steps:

[0071] 1. Establish the equation of soil motion in medium-hard rock:

[0072] Considering the tunnel rock mass structure as an elastic single-phase medium, ignoring the existence of physical force, its vector wave equation and constitutive relation can be expressed as:

[0073]

[0074]

[0075] σ ij =λ 1 δ ij ε kk +2μ 1 ε ij (2)

[0076] In the formula, σ ij is the soil skeleton stress tensor; ε kk is the volumetric strain of the soil skeleton; ε ij is the soil skeleton strain tensor; δ ij is the Kronecker parameter, when i≠j, δ ij =0, when i=j, δ ij = 1; λ 1 , μ 1 is the soil skeleton Lame constant; u r is the radial displacement of the soil skeleton medium; u θ is the circ...

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Abstract

A method for calculating deformation and stress of tunnel under non-uniform explosion load comprises the following steps: it is assumed that non-uniform explosion load exist in an infinite medium-hard rock tunnel, the tunnel model is simplified as a rock mass-plane strain model of single-layer lining; according to the elastic wave theory, the governing equation of rock mass is established, and the constitutive equation and constitutive relation of rock mass are deduced to make the transient load, circumferential strain and shear strain change with a formula(shown in the specification). The potential function is introduced to decouple the equilibrium equation of rock mass. The modal equation of a shell in polar coordinates is established, and the relationship between stress and displacement of lining is obtained. The boundary conditions are introduced to solve the undetermined coefficients, and the Internal force solution in tunnel-rock mass is obtained.

Description

technical field [0001] The invention relates to a method for calculating tunnel deformation and stress under the action of non-uniform explosion load, which belongs to the technical field of tunnel engineering. Background technique [0002] With the advancement of urbanization in my country, in order to alleviate the pressure of traffic congestion between urban and rural areas and promote the transformation and development of rural economy, various localities are actively building roads and railway tunnels to promote the transformation of urban structure and industrial upgrading, thereby improving economic benefits. However, the tunnel is a special structure with closed surroundings, and the damage to buildings caused by accidental explosions inside the tunnel has gradually become a common concern in the engineering field. [0003] When an explosion occurs in a road or railway tunnel, it is often difficult to predict the location of the explosion, and most of them are affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/12
CPCG06F17/12G06F30/13
Inventor 陶彪耿大新胡文韬刘豆曾罗兰王俊刘鑫磊
Owner EAST CHINA JIAOTONG UNIVERSITY
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