A combined retaining structure suitable for slope stability support and its construction method

Abstract

The invention belongs to the technical field related to geotechnical engineering slope stabilization supports, and discloses a combined retaining structure suitable for a slope stabilization support and a construction method thereof. The retaining structure comprises an slide-resistant pile, a crown beam, a reinforced retaining wall, an EPS plate and a rigid panel, wherein the slide-resistant pilepenetrates through the covering soil layer and then is anchored in the good ground, the crown beam is arranged on the slide-resistant pile, the rigid panel is arranged on the crown beam and is connected with the reinforced retaining wall, the reinforced retaining wall comprises a wall surface, a geogrid and filing soil, the EPS plate is arranged behind the reinforcement area, and is built to a certain height along with the reinforced retaining wall, the geogrid at the top spans the EPS plate, namely the length of the geogrid on the top is larger than the interval between the EPS plate and therigid panel, a connecting component is arranged between the rigid panel and the reinforced retaining wall and is correspondingly connected with the rigid panel and the reinforced retaining wall. According to the combined retaining structure, the stability is improved, the construction difficulty is reduced, and the applicability is good.

Description

technical field [0001] The invention belongs to the related technical field of slope stability support in geotechnical engineering, and more specifically relates to a combined support structure and a construction method thereof in which an EPS board is arranged behind a reinforced earth retaining wall suitable for slope stability support. Background technique [0002] In recent years, with the large-scale construction of transportation infrastructure in western my country, a large number of high-filling projects on complex terrain in mountainous areas have appeared. Such high-filling projects often have the following characteristics: (1) The filling height reaches tens to Hundreds of meters, large deformation after construction; (2) Located on valleys, steep slopes and other terrains, the site is narrow, and it is difficult for large construction machinery to enter the site; (3) The slope is steep, the covering coating is less stable, and the bearing capacity is lower , and th...

AI Technical Summary

Problems solved by technology

The disadvantages are: (1) It is not suitable for landslides, water erosion and other unfavorable geological areas; (2) The panel stiffness of the traditional back-wrapped and modular reinforced earth retaining walls is small, and the height of a single-stage wall is generally below 10 meters If it is too high, it is easy to cause large wall deformation or overall instability, and at the same time, it is easy to cause a large-scale collapse due to local tie bars breaking; (3) Even if the overall cast-in-place reinforced concrete panel is used, the traditional process is to pour the panel first and then Filling, at this time, it will make it difficult to compact the filling behind the wall, and the differential settlement between the face plate and the reinforced soil is relatively large, and the reinforcement material directly connected to the face plate is also prone to settlement due to the construction of filling soil compaction and excessive foundation differences connection failure occurs

In addition, for the high filling project on the complex terrain in the western mountainous area, the single use of anti-slide piles will lead to excessive pile length and embedding depth, which will greatly increase the cross-sectional area of ​​the pile body, increase the difficulty of construction, and increase the project cost

For the EPS (polystyrene foam) board, by setting the EPS board on the stressed side of the retaining structure, the easy compressibility (controlled yield) of the EPS board can be used to fully mobilize the strength of the retained soil body itself. Shear strength, within the allowable deformation range, reduces the lateral earth pressure acting on the retaining structure to varying degrees, thereby improving the external stability of the retaining structure, reducing the requirements for retaining strength, and saving engineering costs, but Due to the difference in structural form and action mechanism, the above-mentioned EPS board setting method is not suitable for reinforced soil retaining walls

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