Novel highway embankment widened structure and construction method

Abstract

The invention relates to a novel highway embankment widened structure. The original roadbed slope of the structure is trimmed into a step shape, a high pressure jet grouting pile is disposed below an original roadbed slope cushion layer, pressurized continuous grouting is employed at an original roadbed cushion layer to form a slurry solid bearing plate, parts of pore cavities of the original roadbed are recharged with fine aggregate concrete or mortar; foundation treatment piles are employed to reinforce the foundation of a widened area, a drainage cushion layer is laid throughout the top of the foundation treatment piles; an earthwork cloth is laid on the drainage cushion layer, a cement soil plate is disposed on the earthwork cloth, high strength reinforcing mesh sheets are disposed in the cement soil plate; and the widened area embankment is formed by layered filling of excavation soil and light filler in a construction process. The structure provided by the invention can reinforce the bearing capacity of roadbed soil on both sides of the widened area and the original roadbed slope strength, and enhance the integrality of the embankment structure, reduce longitudinal cracks induced by differential settlement and the like at the juncture of new and old roadbeds, thus having good technical and economic benefits. The invention also discloses a construction method of the novel highway embankment widened structure.

Description

technical field [0001] The invention relates to a novel highway embankment widening structure and construction method which can simultaneously improve the bearing capacity and integrity of the old and new roadbeds in the widened area, and reduce longitudinal cracks at the junction of the old and new roadbeds due to differential settlement. Belonging to the field of highway engineering, it is suitable for single-sided or double-sided highway widening projects in old road reconstruction and expansion projects, especially for highway reconstruction and expansion projects in soft soil areas. Background technique [0002] In recent years, with the rapid development of our country's economy, the traffic volume of highways has increased year by year, and the traffic volume of some highways is close to saturated traffic volume. In this regard, in order to meet the growing traffic demand and social development needs, there are more and more highway reconstruction and expansion projec...

AI Technical Summary

Problems solved by technology

However, the method fails to realize the lateral reinforcement of the embankment structure and the deep transfer of the upper load, and the control effect on differential settlement is limited

[0005] In summary, although there are some measures that can be used to solve the problem of differential settlement in the widening area of ​​the old road, the combined application of various measures is of positive significance for controlling the differential deformation of the embankment in the later stage and enhancing the integrity of the junction of the old and new embankments. However, the existing measures are mainly aimed at newly-filled embankments, and there are few designs involving the improvement of the bearing capacity of old embankments. It is difficult to apply to road sections with high embankment filling heights and high requirements for differential settlement control.

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