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A Method for Calculating Deformation and Stress of Tunnel under Non-uniform Explosive Loading

A blast-loaded, non-uniform technology used in complex mathematical operations, design optimization/simulation, special data processing applications, etc.

Active Publication Date: 2022-05-03
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

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  • A Method for Calculating Deformation and Stress of Tunnel under Non-uniform Explosive Loading

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Embodiment Construction

[0068] The specific embodiment of the present invention is as figure 1 shown.

[0069] like 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:

[0070] 1. Establish the equation of soil motion in medium-hard rock:

[0071] 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:

[0072]

[0073]

[0074] σ ij =λ 1 δ ij ε kk +2μ 1 ε ij (2)

[0075] 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 circumf...

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Abstract

A method for calculating tunnel deformation and stress under the action of non-uniform blast loads, comprising the following steps: assuming that there is a non-uniform blast load in an infinitely long medium-hard rock tunnel, the tunnel model is simplified to the plane strain of rock mass-single-layer lining Model; establish rock mass control equations according to elastic wave theory, re-deduce rock mass motion equations and constitutive relations so that transient load, hoop strain, and shear strain change with time; introduce potential function to decouple rock mass balance equations; establish polar The shell modal equation under the coordinates is used to obtain the relationship between the stress and displacement of the lining; the boundary conditions are introduced to solve the set undetermined coefficients, and finally the internal force solution in the 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 Patents(China)
IPC IPC(8): G06F30/20G06F30/13G06F17/12G06F119/14
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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