Supporting treatment construction method for high and steep side slopes of tunnel portal bedding strong weathered rocks

Abstract

The invention discloses a supporting treatment construction method for high and steep side slopes of tunnel portal bedding strong weathered rocks. The method comprises the following steps: (1) densely-arranged steel pipe piles which are distributed in an approximate semicircular arc mode are arranged outside a design boundary of a main slope, U-shaped drainage grooves are constructed and formed along the inner sides of the densely-arranged steel pipe piles, geogrids are paved within the range of 1-2 m along the outer sides of the densely-arranged steel pipe piles, and a layer of concrete is sprayed to the surfaces of the grids; (2) an anchor cable frame beam structure is arranged on the surface of the side slope on the inner sides of the densely-arranged steel pipe piles, a concrete layerslightly higher than a frame beam is built along the inner side of each frame, and hollow polygonal edge blocks are evenly arranged in the frames; (3) a plurality of reinforced concrete piles are evenly arranged on the left side and the right side of the tunnel portal design boundary at intervals; and (4) a foundation pit is excavated along the outer side of the reinforced concrete piles, and a reinforcement cage is built along the foundation pit and around the reinforced concrete piles to form a retaining wall structure. The method can effectively solve the problem of treatment of the high and steep side slopes of the bedding strong weathered rocks, and has the advantages of efficient construction, safe structure and the like.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction, and in particular relates to a construction method for supporting and treating high and steep side slopes of strongly weathered rock along layers of tunnel openings. Background technique [0002] With the continuous increase of highway and railway mileage in our country, more and more projects need to be constructed under complex terrain and landform conditions. Digging tunnels in mountainous areas has become the normal state of road construction in mountainous areas. Due to the complex terrain and large geological changes in mountainous areas, slope support is particularly important here. In recent years, with the development of engineering construction, slope landslide accidents often occur, seriously threatening personal and property safety. [0003] At present, structures such as retaining walls, anti-slide piles, anchor cable frame beams, and soil nail walls are common...

AI Technical Summary

Problems solved by technology

[0003] At present, structures such as retaining walls, anti-slide piles, anchor cable frame beams, and soil nail walls are commonly used for slope retaining protection, which are mostly used for slope protection with good foundation conditions and low heights, but faced with adverse geological Conditions, super high or steeply inclined slopes, a single support method is not effective and cannot achieve efficient support effects

Especially when it comes to the treatment of unfavorable slopes such as bedding and strongly weathered rocks at tunnel entrances, due to the complex geological conditions in mountainous areas and the large disturbance caused by tunnel excavation, it is even more difficult for a single support method to effectively prevent slope slides. Effect

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