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Deep chamber surrounding rock pressure calculating method

A technology of surrounding rock pressure and calculation method, which is applied in the field of rock mechanics and surrounding rock pressure, can solve the problems of too many calculation assumptions of surrounding rock pressure, insufficient rigor of reasoning, and insufficient accuracy of calculation results, etc.

Inactive Publication Date: 2017-05-17
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

However, in the above-mentioned analysis process using the limit analysis method, there are currently problems such as too many assumptions in the calculation of surrounding rock pressure, insufficient rigor in reasoning, and insufficient accuracy of calculation results.

Method used

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  • Deep chamber surrounding rock pressure calculating method
  • Deep chamber surrounding rock pressure calculating method
  • Deep chamber surrounding rock pressure calculating method

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Embodiment Construction

[0084] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0085] Such as figure 1 As shown, a calculation method for the surrounding rock pressure of a deep buried chamber, the steps are as follows:

[0086] Step 1: Build a destruction mechanism.

[0087] With reference to many upper limit analysis failure mechanisms and research results on earth pressure, foundation bearing capacity, retaining wall pressure, slope, shallow buried chamber, deep buried chamber, etc., three failure mechanisms were constructed according to the numerical analysis method, which are single-circle Arc interlayer failure mechanism, double arc interlayer failure mechanism, logarithmic spiral and arc interlayer failure mechanism, and then construct the optimal failure mechanism based on the optimization results of the three failure mechanisms.

[0088] The failure mechanism of the single-arc interlayer: it is composed of "a wedge-shap...

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Abstract

The invention discloses a deep chamber surrounding rock pressure calculating method. The method comprises the following steps that a kinetically admissible velocity field is built according to the failure mechanism; upper limit analytical solutions of fracture loads are derived and obtained on the basis that internal power is equal to external power; a minimum value is obtained in the plurality of fracture loads, that is the optimal upper limit solution is obtained. The failure mechanism comprising a wedge-shaped collapsing body sliding down, a rotational arc body with the vertex angle as the center of a circle and n translational triangular bodies is provided, then the upper limit analytical solutions of fracture loads are derived and obtained on the basis that the internal power is equal to the external power, the minimum value is obtained in the plurality of fracture loads by means of the optimization method, and the optimal upper limit solution is obtained. The upper limit solution is a strict upper limit value of the surrounding rock pressure, and a theory reference can be provided for supporting designs of the engineering structure.

Description

technical field [0001] The invention relates to the field of rock mechanics surrounding rock pressure, in particular to a calculation method for the surrounding rock pressure of a deeply buried chamber. Background technique [0002] When analyzing underground engineering, it is generally necessary to study the stress-strain relationship of soil, that is, the constitutive relationship of rock and soil. At the initial stage of loading, the soil will be in the elastic stage, and the mechanical properties of the soil can be described by Hooke's law. When the stress intensity increases to the yield limit, the mechanical characteristics of the soil will enter the plastic flow stage from the elastic stage, that is, the stress will remain unchanged and the deformation will continue to increase. When the deformation of the soil increases to a certain critical value, the ultimate load is reached, and the soil will slip or fail. The limit analysis method does not need to analyze the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张道兵张佳华
Owner HUNAN UNIV OF SCI & TECH
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