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Calculation method of maximum temperature tensile stress during the construction period of doorway-shaped lining side wall concrete

A technology of maximum temperature and calculation method, applied in electrical digital data processing, instrumentation, geometric CAD, etc., can solve the problems of inability to calculate temperature stress, difficult temperature crack control target, inability to effectively achieve temperature crack control target, etc.

Active Publication Date: 2021-07-06
WUCHANG UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In doing so, firstly, the temperature control standard for dam concrete cannot be applied to thin-walled lining structures, and does not reflect the influence of differences in concrete strength, surrounding rock performance, lining thickness, and structural scale; secondly, the construction unit calculates the maximum temperature inside the lining side wall concrete The error of the large number of coefficients is highly artificial; the temperature difference between the two aspects may lead to a large distance between the formulated construction plans, and the target of temperature crack control cannot be effectively achieved.
In particular, the analytical temperature stress is not calculated
[0007] Based on the above situation, at present, there are no clear requirements and technical standards for temperature control and anti-cracking during the construction period of concrete lining side walls in underground engineering; the existing design calculation methods, finite element method, take a lot of time and cost, and cannot be applied without concrete test results The preliminary design stage and the rapid adjustment of the construction plan; the strong constraint method has a large error, and the temperature stress cannot be calculated; it is difficult to effectively achieve the temperature crack control target

Method used

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  • Calculation method of maximum temperature tensile stress during the construction period of doorway-shaped lining side wall concrete
  • Calculation method of maximum temperature tensile stress during the construction period of doorway-shaped lining side wall concrete
  • Calculation method of maximum temperature tensile stress during the construction period of doorway-shaped lining side wall concrete

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Experimental program
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Effect test

Embodiment 1

[0081] F2-type 1m-thick lining in the non-pressure section of the flood discharge tunnel in the type III1 surrounding rock area of ​​the gate-shaped section

[0082] The F2 1m-thick lining in the Class III1 surrounding rock area is the structural section with the largest number of door-shaped sections in the unpressured section of the flood discharge tunnel, and it is difficult to control the temperature and prevent cracking.

[0083] Such as Figure 5 As shown, the method for calculating the maximum temperature tensile stress during the construction period of the doorway-shaped lining side wall concrete provided by this embodiment includes the following steps:

[0084] Step 1. Collect the data for temperature control and anti-crack calculation of the concrete structure of the lining side wall:

[0085] Lining side wall design data, lining side wall section, concrete strength grade; environmental data, deformation modulus of surrounding rock under geological conditions, annu...

Embodiment 2

[0099] F4-type lining in the non-pressure section of the flood discharge tunnel in the type IV surrounding rock area of ​​the gate-shaped section

[0100] The basic information is the same as above. In order to reduce the length of the paper, only a brief introduction of the summer temperature control calculation results of the F4-type lining in the surrounding rock area of ​​Category IV is briefly introduced.

[0101] In the design stage, the pouring and construction will begin on August 1 in summer, and the temperature in the cave will be T a is 25°C, pouring at 18°C ​​+ cooling with water at 15°C, the calculated σ max = 1.74MPa; less than the axial tensile strength standard value is 2.39MPa, so the design and construction scheme meets the requirements. Construction real-time control stage, pouring construction on August 1 in summer, the temperature inside the cave is T a is 25.99°C, pouring at 18°C ​​+ cooling with water at 15°C, the calculated σ max = 3.12MPa. The σ ...

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Abstract

The invention provides a method for calculating the maximum temperature tensile stress during the construction period of the door-hole-shaped lining side wall concrete, which is characterized in that it comprises the following steps: Step 1. Collecting data for calculating the temperature control and anti-cracking of the door-hole-shaped lining side wall concrete; Step 2. Calculating the door opening The maximum temperature tensile stress σ of concrete lining side wall during construction period max =0.0583×L+0.0638×C+0.1643×T 0 ‑0.1394×T a +0.1471×(T a ‑T min )‑0.0007×T g ×C+0.0253×E×H‑0.8201. The calculation formula of this method is simple, and it can quickly calculate the maximum temperature tensile stress during the construction period of pouring door-shaped cross-section structure lining side wall concrete, and the calculation error is small. Change, real-time and rapid calculation of temperature and tensile stress during the construction period, in order to achieve the temperature control goal.

Description

technical field [0001] The invention belongs to the technical field of temperature control and anti-cracking of engineering structure concrete, and in particular relates to a method for calculating the maximum temperature tensile stress during the construction period of the concrete for lining side walls with doorway-shaped sections. Background technique [0002] Cracks are one of the main diseases of concrete. According to the dominant cause of cracks, it can be divided into two categories: structural cracks caused by external loads and non-structural cracks caused by deformation changes. Deformation effects include temperature, drying shrinkage and wet expansion, and deformation of surrounding rock, among which 80% are temperature cracks. In recent years, with the rapid development of water conservancy and hydropower engineering construction, the scale and section size of underground hydraulic engineering have become larger and larger, and the environmental conditions suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F119/14
Inventor 段亚辉樊启祥方朝阳段次祎欧阳玉华
Owner WUCHANG UNIV OF TECH