Plate supporting type embankment technology 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 in particular relates to a plate-supported embankment technology for post-construction settlement control of deep and thick soft soil foundations of high-grade highways. Background technique [0002] There are a large number of weak soil foundations in my country's coastal and inland lake areas. To build expressways, high-speed railways, river embankments, etc. on weak soil foundations, it is necessary to treat the weak soil foundations to control post-construction settlement (that is, after the embankment is put into operation, it must be repaired after the construction is completed). Subsidence generated within a period of 10-15 years). For high-grade highways, the post-construction settlement control requirement for general road sections is 30cm, and for bridgehead sections is 10cm. There are generally two types of post-construction settlement control methods for deep and weak so...

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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