Pre-stressed anchor cable combined ultrahigh composite reinforced soil abutment and construction method thereof

Abstract

The invention discloses a pre-stressed anchor cable combined ultrahigh composite reinforced soil abutment and a construction method thereof. The ultrahigh composite reinforced soil abutment is structurally provided with multiple stages of abutment bodies from top to bottom. Geogrids with equal intervals are laid on each stage of abutment, an inverted filter layer formed by piling up geogrids whichare filled with gravels and wrapped by geotextile is arranged at the side close to a panel, a reinforced concrete panel is arranged outside the inverted filter layer, a reinforced concrete horizontalcushion layer is arranged in the lower portion of the panel of each stage of abutment and buried for a certain depth, and a concrete bent cap is arranged in the upper portion. According to the composite reinforced soil abutment, pre-stressed anchor cables anchored into the mountain rock stratum are combined with the lowest-stage abutment, the overall stability and the anti-overturning capacity ofan unreinforced soil body and the whole reinforced body structure are greatly improved, and the constraint of the pre-stressed anchor cables on the retaining wall body can further effectively resistthe bending moment of lateral soil pressure from backfill behind the wall on a bottom-layer panel of the abutment.

Description

technical field [0001] The invention relates to a super-high composite reinforced soil abutment combined with prestressed anchor cables and a construction method thereof, belonging to the technical field of geotechnical engineering. Background technique [0002] Modern reinforced soil technology originated in France in the 1960s. It was mainly used in retaining walls in the early days. With the continuous development of this technology, it has gradually been applied to places that need to bear heavy loads, such as rail transit, industrial buildings and highway etc. Especially in recent years, the application of reinforced soil technology on abutments has developed rapidly in some developed countries in Europe and America. [0003] The reinforced soil abutment is a reinforced body structure composed of reinforcement, backfill and retaining wall panels. The reinforcement is placed between the fillings to overcome the weakness of the soil itself in terms of low tensile strengt...

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Problems solved by technology

[0005] Even so, reinforced earth abutments still have their shortcomings. Traditional reinforced earth abutments are difficult to build superhigh abutments with a height of more than 20 meters. The reinforced body structure composed of material and filling soil can only guarantee its internal stability, while the overall stability and anti-overturning ability of the unreinforced soil body and the entire reinforced body structure are seriously reduced, which is very easy to cause reinforcement. The earth abutment slides along the slope of the mountain; with the increase of the height of the single-stage abutment, the mass of the backfill behind the wall increases continuously, which makes the center of gravity of the backfill rise, the lateral earth pressure increases, and a large bending moment is generated on the bottom panel , causing the wall to bulge, bulge, and even partially crack, break and fall off the panel

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