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A method for simulating the whole process of tunnel excavation

A technology of tunnel excavation and simulation method, which is applied in the direction of instrumentation, calculation, electrical digital data processing, etc., and can solve the problems that the third principal stress cannot be considered

Inactive Publication Date: 2017-12-26
CHONGQING UNIV
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Problems solved by technology

This method is inconsistent with the new Austrian method in actual construction, and the third principal stress cannot be considered

Method used

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  • A method for simulating the whole process of tunnel excavation
  • A method for simulating the whole process of tunnel excavation

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Embodiment Construction

[0016] A method for simulating the whole process of tunnel excavation, the method comprising the steps of:

[0017] 1) Obtain the creep law of the surrounding rock through the rock creep test: take cores from the surrounding rock of the tunnel to be simulated, process it into a cylindrical specimen with a diameter of 50mm and a height of 100mm, and conduct a traditional uniaxial creep test to obtain different axial stresses Under the state, the creep strain of the specimen varies with time.

[0018] 2) Use the ANASYS implicit creep equation to fit the creep results:

[0019]

[0020] Among them, ε cr is the equivalent rock creep strain, t is the time, σ is the rock equivalent stress, e is the natural constant, T is the temperature, is the equation parameter (the rock parameter obtained by fitting the experiment);

[0021] When the temperature effect is not considered, the parameter c 4 and c 7 is zero, the equation can simulate the initial stage of creep and the secon...

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Abstract

The invention discloses a method for simulating the whole process of tunnel excavation, which is characterized in that the surrounding rock mass in the tunnel construction is regarded as a time-related structure, so the method of simulating creep can be used to simulate the conditions under different construction stages The dynamic changes of the surrounding rock can be used to simulate the entire tunnel excavation process. The steps are as follows: 1) Obtain the creep law of the surrounding rock through the rock creep test; 2) Fit the creep equation parameters based on the creep test results; 3) Embed the creep equation into the finite element software, by setting the length of control time, Simulate the whole process of tunnel excavation.

Description

technical field [0001] The invention relates to a method for simulating the whole process of tunnel excavation. Background technique [0002] One of the current tunnel simulation methods is to regard the surrounding rock and lining as elastic-plastic bodies, and simulate the tunnel excavation and support through the life and death of the unit cells. After killing the excavation units, the lining units are directly activated. This method can only obtain the results of the final state, and cannot simulate the changes of the tunnel from excavation to closure, nor can it reflect the process of mutual deformation of surrounding rock and primary lining. The other is based on the load-structure design model, using spring elements to simulate the interaction between surrounding rock and lining. This method is inconsistent with the new Austrian method in actual construction, and the third principal stress cannot be considered. Contents of the invention [0003] Aiming at the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 任松姜德义吴建勋陈结邓高岭李振元欧阳讯蒲文明崔遥
Owner CHONGQING UNIV
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