Subgrade treatment structure of soft soil areas and construction technology thereof

Abstract

The invention discloses a subgrade treatment structure of soft soil areas, which is arranged on the soil matrix, wherein a hill-skin oil bearing layer, a limestone soil adjustment layer and a pavement structure layer are sequentially arranged from bottom to up and have the height of 60cm to 80cm; and the limestone mixing amount of the limestone soil adjustment layer is 8% to 10%. The subgrade treatment structure also comprises at least one seeping tank which is also used as a wall chase. The invention further discloses a construction technology of the subgrade treatment structure. Because the limestone mixing amount of the limestone soil is increased, the strength of the limestone soil adjustment layer is increased, a break stone water-resistant layer is dispensed, the designed elevation of a road is reduced, accordingly, under the premise of ensuring the strength and stability of a subgrade, the engineering earth volume is reduced, and the construction investment is reduced. The limestone mixing amount of the limestone soil is appropriately improved, the whole strength of the pavement is also benefited, meanwhile, the stability of the subgrade under the groundwater level freeze-thaw cycle condition is also improved, and the whole stability of the pavement is improved.

Description

technical field [0001] The invention relates to the technical field of roads, in particular to a roadbed treatment structure in soft soil areas. The invention also relates to the construction technology of the roadbed treatment structure. Background technique [0002] Such as figure 1 Shown is a schematic diagram of the cross-sectional structure of a common subgrade treatment structure in soft soil areas. On the soil foundation, a 60 cm to 80 cm mountain soil supporting layer 1 is first set up, and then 40 cm of gravel is built upward to prevent water Layer 2, so that the groundwater table B is located in the gravel aquifer 2 to prevent groundwater from eroding the subgrade. Fill the lime soil adjustment layer 3 with a lime content of 6% on the crushed stone water-proof layer 2, and finally build the pavement structure 4 to make the pavement structure 4 reach the design elevation A (refer to figure 1 in A). [0003] However, in coastal areas and some areas along lakes an...

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Problems solved by technology

However, in the case of the reduced design elevation, a 40 cm gravel water-resisting layer 2 is installed to prevent groundwater from eroding the subgrade, which cannot meet the minimum thickness requirement of the lime soil adjustment layer 3

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