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Method for calculating full-age compressive strength of underground construction concrete

A technology of compressive strength and underground engineering, applied in the direction of calculation, design optimization/simulation, special data processing applications, etc., can solve the problems that cannot reflect the impact, can not meet the design calculation, safety evaluation and service life research, etc., to achieve convenient use , high-precision calculation, simple calculation formula effect

Inactive Publication Date: 2017-08-22
CHINA THREE GORGES PROJECTS DEV CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0021] Based on the above situation, the current calculation method of the full-age compressive strength is no longer suitable for the full-age calculation of the high-performance concrete compressive strength of modern underground engineering, and cannot meet the needs of design calculation, safety evaluation and service life research. The design calculation, safety evaluation and service life research of fly ash and its different fly ash content concrete underground engineering structures cannot reflect the significant differences between pumping and pumping concrete cementitious materials and their dosage and admixtures. to influence

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  • Method for calculating full-age compressive strength of underground construction concrete
  • Method for calculating full-age compressive strength of underground construction concrete
  • Method for calculating full-age compressive strength of underground construction concrete

Examples

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example 1

[0083] Example 1: Concrete for the rock wall crane beam of the underground powerhouse of the hydropower station

[0084] The maximum width of the volute of the underground powerhouse of the Xiluodu Hydropower Station is 27.69m, and the diameter of the volute inlet is 7.20m. The volute concrete construction adopts layered pouring from bottom to top, the thickness of the pouring layer is about 1.50-2.0m, and the rising speed is 0.3-0.5m / h. The volute concrete design consideration is the 28-day secondary mix C25 normal concrete. During the structural design in the feasibility study design stage, the finite element method is used to calculate the safety under the action of dynamic and static forces at various stages from the construction period to the operation period, so it is necessary to calculate the compressive strength of the whole age.

[0085] (1) Analysis and calculation to determine the design age compressive strength of concrete

[0086] In the stage of feasibility st...

example 2

[0103] Example 2: Concrete lining of spillway tunnel

[0104] A certain hydropower station is a large (one) type, and the flood discharge tunnel is a class I structure. The design strength grade of the lining concrete in the non-pressure section of the spillway tunnel is C 90 40 normal concrete. The calculation of the full-age compressive strength is required in the calculation and analysis of the safety of the lining structure during the operation period.

[0105] (1) Analysis and calculation to determine the design age compressive strength of concrete

[0106] It will take quite a long time for the spillway tunnel to be put into use after it is completed, so the 90d age design is adopted, and the concrete strength grade is C 90 40. In view of the importance of the safe operation of the spillway tunnel, the optimization of the lining concrete mix ratio and the comprehensive design index performance test were carried out during the bidding design process. According to the...

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Abstract

The invention discloses a method for calculating full-age compressive strength of underground construction concrete. The method comprises the following steps of (1) carrying out analysis and calculation to determine a design-age compressive strength of concrete; (2) calculating a 28d-age compressive strength of the concrete; and (3) calculating a full-age compressive strength of the concrete. The method disclosed by the invention is simple in calculation formula, is based on statistical analysis of more than 250 fly ash concrete compressive strength test results of a large number of practical underground constructions, is capable of reasonably reflecting a relationship between compressive strength of underground construction concrete and the age, a relationship between typical-age compressive strengths and the influences of fly ash replacement, is capable of rapidly calculating the full-age compressive strength of the underground construction concrete in high precision, and completely can be applied to the design calculation, safety evaluation and service life research of practical constructions, the research of influences of the fly ash replacement, and especially the preliminary design and on-site real-time calculation analysis.

Description

technical field [0001] The invention relates to the technical field of concrete construction engineering design calculation, safety evaluation and service life research, and research on the influence of fly ash content, in particular to a method for calculating the full-age compressive strength of underground engineering concrete. Background technique [0002] Underground engineering has developed rapidly in recent years, its scale is getting larger and its structure is becoming more and more complex, and the requirements for its safety and service life are also getting higher and higher. When conducting complex structural design calculations, safety assessments, and service life studies, it is necessary to calculate the full-age compressive strength of the concrete for this project. [0003] In some full-age compressive strength calculation methods based entirely on the test, although the accuracy is high, the test time is long and the cost is high. It is difficult for the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/08
CPCG06F30/23G06Q50/08
Inventor 樊启祥段亚辉洪文浩廖建新聂庆华彭作为苏立许传稳郑斌
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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