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Safety evaluation method based on shield tunnel segment joint opening amount

A technology for shield tunnel segment and safety evaluation, which is applied in the field of safety evaluation based on the opening amount of shield tunnel segment joints, can solve problems such as overall structural stability decline, bolt corrosion, and concrete material deterioration, and achieves a reliable calculation method. , Simple operation, easy to promote the effect

Active Publication Date: 2020-06-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The joints of the segments are less rigid than the overall cast-in-place concrete structure, and since the joints between the segments are sealed by water-stop rubber, when the joints are too wide, it will lead to leakage, water gushing, soil and sand inflow, bolt corrosion, A series of unfavorable problems such as the deterioration of concrete materials and the decline of the overall stability of the structure threaten the safety and stability of the shield tunnel
At present, the methods for safety evaluation of shield tunnels mainly include model test and numerical simulation, and there is no reliable method for judging the safety of shield tunnels considering the important index of joint opening.

Method used

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  • Safety evaluation method based on shield tunnel segment joint opening amount
  • Safety evaluation method based on shield tunnel segment joint opening amount
  • Safety evaluation method based on shield tunnel segment joint opening amount

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] like figure 1 , figure 2 As shown, the safety evaluation method based on the opening of shield tunnel segment joints disclosed in the present invention is to calculate and judge whether the bolt tensile stress at the maximum opening of the joint exceeds the limit value according to the opening of the joint, so as to ensure the safety of the shield tunnel. Safety and stability, the relationship between joint bolt stress and joint opening is determined by formula (1):

[0031]

[0032] Where: σ B is the joint bolt stress, x is the distance from the compressed outer edge to the neutral axis, d is the effective height of the tensile member, A B is the effective area of ​​the bolt, and M is the bending moment at the joint.

[0033] Specifically, the dist...

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Abstract

The invention discloses a safety evaluation method based on the joint opening amount of shield tunnel segments, which calculates and judges whether the bolt tensile stress at the maximum joint openingposition exceeds a limit value or not according to the joint opening amount so as to ensure the safety and stability of a shield tunnel, and discloses a relational expression of the joint bolt stressand the joint opening amount. According to the method, the safety evaluation of the tunnel structure is rapidly carried out, and a new way for safety evaluation of the shield tunnel structure is provided.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a safety evaluation method based on the opening amount of joints of shield tunnel segments. Background technique [0002] In recent years, with the development of railway and highway network construction, the construction of high-standard railway and highway tunnels has been in full swing. Due to the constraints of various factors such as complex terrain and geological conditions, high design and use requirements, higher requirements are put forward for the safety of shield tunnels. [0003] At present, in the process of constructing tunnels using the shield method, the circular lining ring is mainly constructed by assembling prefabricated reinforced concrete segments into fabricated segments. Among them, the segments are mainly connected by horizontal and longitudinal bolts. Segment joints have always been the key point in the design and construction of shield tunne...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/17E21D11/08G06F119/14
CPCE21D11/08
Inventor 张志强陈彬科周小杰林迪睿赵宇
Owner SOUTHWEST JIAOTONG UNIV
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