Subgrade structure for preventing high-fill soil from settling and construction method

Abstract

The invention discloses a subgrade structure for preventing high-fill soil from settling and a construction method. The subgrade structure comprises a base body, a side slope module, a bottom plate module, a top plate module and an extrusion column. The base body is composed of a gravel layer and a lime earth rammed earth layer, a plurality of circular through holes are arranged in the top plate module, and the extrusion column can be driven into the lime earth rammed earth layer through the circular through holes. According to the construction method, the subgrade structure is used, firstly,the original ground is treated, then pouring is performed to form the bottom plate module, the base body is arranged on the bottom plate module, then pouring is performed to form the side slope moduleand the top plate module, and finally the lime earth rammed earth layer is tightly extruded through the extrusion column. In the present invention, the bottom plate module, the side slope module andthe top plate module which are formed by pouring concrete effectively protect the base body, phenomena of collapse, breakage, sliding and the like caused by external influences are reduced, a drainagepipe drains water in the base body, a situation that stability is reduced due to a fact that a subgrade is soaked in water is avoided, and the extrusion column is used for extruding a lime earth rammed earth layer to enable the lime earth rammed earth layer to be tighter.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to a subgrade structure and a construction method for high filling soil settlement prevention. Background technique [0002] Subgrade refers to the belt-shaped structure built according to the route position and certain technical requirements, and is the foundation of the road surface. In terms of materials, the subgrade can be divided into three types: soil subgrade, stone subgrade and earth-rock subgrade. The main function of the subgrade is to provide necessary conditions for track laying, road surface laying and vehicle operation, and to bear the load from the track, road surface and vehicles. To transmit and spread the load to the depth of the foundation, in civil engineering, the subgrade plays an important role in terms of construction quantity, floor area and investment. [0003] High-fill subgrade refers to subgrades filled with fine-grained kernels with a height...

AI Technical Summary

Problems solved by technology

Due to the high filling height of the high-fill subgrade, the high-fill subgrade is vulnerable to damage from its own regional environment, weather, human activities and geological movements, resulting in the loss of the solidity, stability and durability of the subgrade.

In particular, the roadbed is exposed to the external environment for a long time and is easily washed by rainwater. The matrix of the roadbed is easily swollen or loosened by water penetration, resulting in instability of the roadbed, resulting in overall or partial subsidence of the roadbed, hindering traffic or causing traffic accidents. It is not safe, so the roadbed needs frequent maintenance, roadbed maintenance is time-consuming and labor-intensive, the labor intensity is high, and the roadbed maintenance cost is high

[0004] The current subgrade construction generally prevents subgrade subsidence by setting asphalt barriers and waterproof slopes. However, due to the high filling height of high-fill roadbeds, the construction of asphalt barriers is more complicated, resulting in slow progress and slope waterproofing. It is realized by setting a waterproof membrane, the reliability is poor, and the substrate will still be soaked in water after a long time

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