Tunnel face supporting pressure design method

A design method and technology of the faceplate, applied in the fields of instruments, geometric CAD, electrical and digital data processing, etc., can solve the problems of inaccuracy, time-consuming, low efficiency, etc., and achieve shortened iteration time, saved calculation time, and simple definition. Effect

Active Publication Date: 2021-02-02
WUHAN UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to aim at the deficiencies of the prior art, and provide a method for designing tunnel face support pressure based on the load reduction factor, so as to solve the problem of low efficiency, long time consumption and inaccuracy of the existing methods. question

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  • Tunnel face supporting pressure design method

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Embodiment

[0039] as attached figure 1 As shown, the present invention provides a tunnel face support pressure design method, which is used for design and calculation to determine the ultimate support pressure required to maintain the stability of the face of the tunnel structure and the corresponding value based on a given target safety factor The target support pressure value of . Specifically, the tunnel face support pressure design method includes the following steps:

[0040] Step S1, setting the target safety factor for maintaining the short-term stability of the tunnel face and the initial value of the support pressure according to the current engineering situation.

[0041] In step S1, the minimum set value of the target safety factor is 1.0, and the initial value of the support pressure is less than the initial ground stress. When the safety factor is less than 1, the tunnel is in an unstable state, and when the safety factor is greater than or equal to 1, the tunnel is in a s...

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Abstract

The invention provides a tunnel face supporting pressure design method. The tunnel face supporting pressure design method comprises the following steps: setting a target safety coefficient for maintaining short-term stability of a tunnel face and an initial value of supporting pressure according to the current engineering situation; calculating an actual safety coefficient according to the actualparameters of the tunnel structure and the strength reduction method, and continuously iterating until the calculated safety coefficient is the same as the target safety coefficient; in the iterationprocess, serving the ratio of the support pressure of each step to the load reduction coefficient as the support pressure applied by the next iteration step, performing strength reduction calculationto obtain the safety coefficient, and stopping the operation until the calculated current safety coefficient is equal to the target safety coefficient, wherein the corresponding support pressure is the target value at the moment. According to the method, the iteration time is greatly shortened and is generally more than ten hours, and the shortest iteration time is about two hours; and the problems that an existing method is low in efficiency, long in consumed time and not accurate enough are solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering design, and in particular relates to a design method for tunnel face support pressure. Background technique [0002] For tunnels constructed in weak surrounding rock, due to stress release, the surrounding rock in front of the tunnel face may reach its shear strength and be damaged, which will cause tunnel collapse and endanger the safety of construction personnel and mechanical equipment. Therefore, for this type of tunnel, it is necessary to take various measures to improve its stability, one of which is to apply support pressure to the face of the tunnel. [0003] In the design stage, the most critical task is to determine the appropriate support pressure, and apply it through the shield cutterhead or install the glass anchor in front of the tunnel face to ensure the stability of the tunnel during the construction process. Existing methods for determining support pressure on the fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14Y02T90/00
Inventor 李斌
Owner WUHAN UNIV OF TECH
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