Continuous reinforced concrete slab crossing method for karst areas

Abstract

The invention relates to a continuous reinforced concrete slab crossing method for karst areas. The continuous reinforced concrete slab crossing method comprises the following steps of calculating ofthe reinforcement ratio according to a plastic hinge line theory, and optimizing of the layout position of a continuous reinforced concrete slab according to the influence on the reinforcement ratio and the plastic hinge line theory; in the calculating process of the reinforcement ratio, respectively solving the distribution diagram of the plastic strain increment and abstracting the correspondingdamage type under the conditions of different length-width ratios; under different support conditions, respectively solving the distribution diagram of the plastic strain increment and abstracting the corresponding damage type; according to the support conditions and damage types, calculating extreme bending moment and reinforcement ratio according to the plastic hinge line theory; in the optimizing process of the layout position of the continuous reinforced concrete slab, estimating the size of a collapsing pit according to the size of a karst cave and the property of an upper soil coveringlayer; according to the size of the collapsing pit and the size of load, calculating the influence on the reinforcement ratio by the layout position of the continuous reinforced concrete slab, and selecting the position with minimum reinforcement ratio as the optimum layout position of the continuous reinforced concrete slab. The continuous reinforced concrete slab crossing method has the advantage that the reinforcement requirement can be quickly calculated.

Description

technical field [0001] The invention belongs to the field of roadbed construction in karst areas, and in particular relates to a continuous reinforced concrete slab spanning method in karst areas. Background technique [0002] The foundation collapse in karst areas is usually localized and not large in scale, and its planar shape is mostly circular, and a few are elliptical. For example, among the karst collapses that occurred in Guilin City, circular and oval collapses accounted for 85% of the total, with diameters generally ranging from 1m to 5m, and those less than 3m accounted for 75%. For small-scale subsidence, adopting continuous reinforced concrete slab pavement structure is an economical and effective treatment method. When meeting the bending and shearing requirements of the section, the reinforcement is usually added based on experience and then checked. [0003] Although the above method has played an important role in the calculation of the reinforcement ratio...

AI Technical Summary

Problems solved by technology

[0004] (1) The calculation process is complicated and error-prone, and it is not easy to check;

[0005] (2) It often takes many trial calculations to obtain satisfactory results, and the efficiency is relatively low;

[0006] (3) Only one underlying karst cave can be calculated at a time, and it needs to be recalculated when the geological conditions change

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