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Near-field dynamics method and system for tunnel rock mass damage inrush water catastrophe simulation

A dynamic and tunneling technology, which is applied in the field of near-field dynamics method and system for the simulation of inrush water disaster in tunnel rock mass failure, can solve discontinuous geological disasters, is difficult to describe the progressive failure characteristics of rock mass, and cannot reveal the evolution of inrush water channels. mechanism and other issues to achieve efficient solution, ensure calculation accuracy, and improve calculation efficiency.

Active Publication Date: 2020-07-03
SHANDONG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an emerging numerical calculation method, peridynamics has been widely used in the field of solid mechanics. However, there are few studies on large-scale engineering calculations for underground engineering such as tunnels, especially for water inrush during tunnel construction. Large deformation and discontinuous geological disasters
The inventor found that the existing methods are difficult to describe the progressive failure characteristics of rock mass under the action of excavation and unloading, and cannot reveal the evolution mechanism of inrush water channels

Method used

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  • Near-field dynamics method and system for tunnel rock mass damage inrush water catastrophe simulation
  • Near-field dynamics method and system for tunnel rock mass damage inrush water catastrophe simulation
  • Near-field dynamics method and system for tunnel rock mass damage inrush water catastrophe simulation

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Embodiment 1

[0028] Attached below figure 1 The present invention is described in detail, specifically, the structure is as follows:

[0029] This embodiment provides a peridynamics method for simulating water inrush catastrophe of tunnel rock mass failure, including the following steps:

[0030] (1) The calculation model is discretized into a series of material points with material physical and mechanical information in space, and a virtual boundary layer with a certain thickness is set outside the boundary of the calculation model. The virtual boundary layer has the same discretization method as the calculation model, and the material Point coordinates, area, volume and other information are stored in matrix respectively.

[0031] The virtual boundary layer is a correction method to weaken the influence of boundary effects on the calculation model, so that external information such as displacement and stress can be effectively transmitted to the calculation model, and to ensure the accu...

Embodiment 2

[0073] This embodiment provides a peridynamics method for simulating water inrush catastrophe of tunnel rock mass failure, including the following steps:

[0074] (1) Model discretization:

[0075] In this example, if figure 2 As shown, the length of the model is 40m, the width is 40m, the thickness is 40cm, the Young's modulus is 30GPa, the Poisson's ratio is 0.33, and the density is 2500kg / m 3 , the buried depth of the tunnel is 600m, the radius of the cave is 4m, and the water pressure of the cave is 4MPa, regardless of the lateral pressure.

[0076] The upper boundary of the model bears the vertical stress generated by the overlying strata, and the lower boundary is the normal fixed constraint boundary. The middle part of the model is a tunnel with a height of about 8m, which will be constructed in 20 excavation steps from left to right. This example is divided into 100 material points along the length direction and width direction, 1 material point along the thickness...

Embodiment 3

[0097] This embodiment provides a tunnel rock mass damage inrush water disaster simulation system, including:

[0098] The model discretization module is used to discretize the calculation model into material points in space, and set a virtual boundary layer outside the boundary of the calculation model as the object of boundary conditions; select the size of the neighborhood of material points to form a neighborhood matrix of material points;

[0099] The parameter equivalent model is used to equate the ground stress of the calculation model to the stress boundary condition of the calculation model, to equate the cave water pressure to the normal pressure of the calculation model, and to transform the displacement constraint and tunnel support into displacement boundary conditions ;

[0100] Solve the judgment model, which is used to solve the velocity and displacement of the material points, and judge whether the bonds of all material points meet the damage conditions, and r...

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Abstract

The invention discloses a near-field dynamics method and system for tunnel rock mass damage inrush water catastrophe simulation, solves the problem that the existing method is difficult to describe the progressive failure characteristics of the rock mass under the action of excavation and unloading and cannot reveal the evolution mechanism of the gushing water channel, and can effectively describethe formation process of the rock mass failure gushing water channel and the damage and failure mechanism of the surrounding rock. According to the technical scheme, a calculation model is discretized into material points, and a virtual boundary layer is arranged on the outer side of the boundary of the calculation model to serve as an object for applying boundary conditions; selecting the neighborhood size of the material points to form a neighborhood matrix of the material points; enabling ground stress to be equivalent to a stress boundary condition of a calculation model, enabling karst cave water pressure to be equivalent to normal pressure, and converting displacement constraint and tunnel support into a displacement boundary condition; solving the speed and displacement of the material points, judging whether the keys of all the material points meet damage conditions or not, and recording local damage conditions; and after the initial balance calculation is stable, simulating atunnel construction process by utilizing a material point dormancy method.

Description

technical field [0001] The invention relates to the field of tunnels and underground engineering, in particular to a peridynamics method and system for simulating water inrush catastrophe of tunnel rock mass destruction. Background technique [0002] With the rapid development of my country's transportation infrastructure construction and the gradual implementation of the strategy of building a strong transportation country, more and more tunnels are built in high mountains and valleys, passing through areas rich in groundwater such as karst. During the construction of the tunnel, affected by unfavorable geological structures such as karst and groundwater, rock mass damage and water inrush disasters are extremely prone to occur, which brings severe challenges to the safety of the project. As one of the important means of geotechnical engineering research, numerical simulation can be used to simulate the evolution process of water inrush disaster and reveal its catastrophic e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/14G06Q50/02
CPCG06Q50/02G06F30/20G06F2111/10G06F30/13G06F30/18
Inventor 李术才高成路周宗青李卓徽杨为民张道生王美霞耿阳王超
Owner SHANDONG UNIV
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