Closed cushion structure and construction method of road subgrade in soft soil area

Abstract

The invention provides a roadbed closed cushion layer structure of a road in a weak soil area and a construction method of the roadbed closed cushion layer structure. The construction method of the roadbed closed cushion layer structure comprises the steps that a bottom layer geogrid is paved on the pile top of a cement stirring pile or a rigid pile, then backfilling of gravel soil mixture is conducted, and one or more layers of gravel soil layers are formed through compaction; the total thickness of the gravel soil layers is not less than 50 cm, and the permeability coefficient is not greaterthan 9*10<-4> cm / s; and a gravel soil mixture is made by mixing gravel and clayey soil according to the proportion of 1:1-1.5:1, and the compaction degree of each layer of the gravel soil layer is not less than 94%. According to the construction method of the roadbed closed cushion layer structure, the water tightness of the cushion layer structure is realized only by optimizing the proportion ofthe gravel soil and controlling the compaction parameter, damage to the roadbed structure of the road due to groundwater disoperation can be greatly reduced, material properties are exerted as far aspossible, the advantage of fast and efficient construction is exerted, and the waterproof property of the graded gravel soil and the overall tensile property of the three-way geogrid are fully utilized.

Description

technical field [0001] The invention relates to a design and construction technology of subgrade cushion in soft soil areas, in particular to a closed cushion layer structure of road subgrade in soft soil areas and a construction method thereof, belonging to the field of road subgrade engineering reinforcement treatment in the discipline of civil engineering. Background technique [0002] With the rapid growth of my country's road mileage, the road operation mileage and road network density in my country's coastal and riverside areas have further increased. The soft soil in coastal and riverside areas is widely distributed and the groundwater level is very high. The road subgrade is usually located in the area of ​​soft soil and high groundwater level. Under the action of the road surface load, the subgrade will experience large settlement and uneven settlement deformation; on the other hand, Under the action of high groundwater level, the strength of the subgrade will be re...

AI Technical Summary

Problems solved by technology

The erosion of high groundwater is not effectively considered in the reinforcement of traditional road subgrades, resulting in the widespread occurrence of water softening diseases in subgrades in areas with high groundwater levels in my country, which seriously threatens the operation safety of road subgrades of all levels

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