Strong Constraint Method and Temperature Control System for Temperature Crack Control of Hydraulic Tunnel Lining Concrete

Abstract

The invention provides a strong constraint method and a temperature control system for hydraulic tunnel lining concrete temperature crack control, which can quickly and accurately calculate the allowable temperature difference ΔT and the allowable maximum temperature [T of the concrete foundation. max ], the highest internal temperature T max , reflecting the influence of concrete strength, surrounding rock performance, lining thickness and structural scale on the temperature control of concrete. The method of the present invention comprises: Step 1. Obtaining the temperature crack control design calculation data of the lining concrete; Step 2. Calculating the allowable temperature difference ΔT of the concrete foundation of the lining structure; Step 3. Calculating the allowable maximum temperature of the concrete lining structure [T max ]; Step 4. For each proposed construction measure scheme, calculate the corresponding maximum temperature T inside the masonry concrete max ; Step 5. From the proposed measures, choose to satisfy T max ≤【T max ], and further determine the preferred measures for construction application based on simple, practical and economical principles.

Description

technical field [0001] The invention belongs to the technical field of concrete temperature control and anti-cracking, and in particular relates to a strong constraint method for controlling temperature cracks of hydraulic tunnel lining concrete and a temperature control system. Background technique [0002] 80% of the cracks in the lining concrete are temperature cracks. As long as no effective measures are taken for the lining concrete of the large-section and high-strength underground hydraulic tunnels constructed in recent years, a large number of cracks will occur without exception, and most of them are penetrating during the construction period. The temperature crack (see figure 1 and figure 2 ). Underground structural engineering has been working in a humid, alternating wet and dry environment for a long time. The existence of hazardous cracks seriously affects the safety of the engineering structure, construction progress and duration, resulting in leakage or even...

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Problems solved by technology

[0008] Based on the above situation, at present, there are no clear technical requirements and standards for the temperature crack control of hydraulic tunnel lining concrete during construction; there is no simple and high-precision design calculation method, and the finite element method is time-consuming and expensive, which cannot be applied to non-concrete tests. The preliminary design stage of the results and the rapid adjustment of the construction plan; the strong constraint method has large errors, and does not reflect the influence of differences in concrete strength, surrounding rock performance, lining thickness, and structural scale; neither can effectively achieve the temperature crack control goal

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