Plate supporting type embankment structure for post-construction settlement controlling of deep soft soil foundation on high-grade highway

Abstract

The invention discloses a plate supporting type embankment structure for post-construction settlement controlling of a deep soft soil foundation on a high-grade highway. A reinforced concrete plate is arranged as a hard shell layer between the soft soil foundation and embankment earth filling, the thickness of the concrete plate ranges from 300 mm to 1000 mm, the concrete plate can be located above the earth surface or be partly embedded into the foundation or be fully embedded into the foundation, a cushion layer can be arranged at the bottom of the concrete plate, the slope ratio of the embankment earth filling is smaller than 1:1.5, the slope surface is wrapped by geotextile, a low retaining walls can be arranged on each of two sides of the concrete plate, the two sides of the concrete plate are close to the edges of the embankment, the bottom of each low retaining wall is fixed with the concrete plate, and overall deformation is achieved. By means of the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, differential settlement of the embankment edges and the embankment center is eliminated, longitudinal cracks of the foundation are avoided, an embankment side slope can not lose stability and not be damaged, and compensation earth volume of the embankment earth filling is decreased. Compared with drainage concretion methods, by means of the plate supporting type embankment structure, post-construction settlement is effectively reduced. Compared with composite foundation methods, the plate supporting type embankment structure is low in cost. According to the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, construction time is short, construction time of the earth filling is merely considered, and the plate supporting type embankment structure is particularly applicable to ordinary road sections on the deep soft soil foundation.

Description

Technical field [0001] The invention belongs to the technical field of civil engineering, and particularly relates to the post-construction settlement control slab-supported embankment technology of a high-grade highway deep and thick soft soil foundation. Background technique [0002] There are a large number of soft soil foundations in the coastal and inland lake areas of my country. The construction of highways, high-speed railways, river embankments, etc. on the weak soil foundations requires treatment of the weak soil foundations to control post-construction settlement (that is, after the embankment is put into operation, it will be overhauled. The settlement occurred within a period of 10-15 years). For high-grade highways, the post-construction settlement control requirement of general sections is 30cm, and that of bridgehead sections is 10cm. There are generally two types of post-construction settlement control methods for deep and weak soil foundations: one type is drain...

AI Technical Summary

Problems solved by technology

For the high-grade embankment on the deep soft soil foundation, because it is a kind of flexible load, after the soft foundation is strengthened by the above treatment method, the additional stress at the center of the embankment and the edge of the embankment are different, and the additional stress at the center of the embankment is greater than that at the edge of the embankment. The settlement in the center of the embankment is larger than that at the edge of the embankment, resulting in uneven settlement in the shape of a "pot bottom" on the ground surface, and in severe cases, longitudinal cracks in the road, which affect the comfort and safety of driving

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