Existing expressway (railway) embankment lightening settlement control method

Abstract

The invention discloses an existing expressway (railway) embankment lightening settlement control method. Steps are dig in slopes at two sides of a road as construction platforms; drilling holes are arranged in construction areas; the drilling holes are dripped into embankments according to certain inclined dip angles; in the drilling process, soil is automatically discharged from spiral drill rods; after the drilling is finished, PVC pipes are inserted in; bagged sands are filled into the PVC pipes, and the exposed ends are added with PVC pipe sealing covers; the replacement of the drilling holes in whole construction sections is finished; the slopes are backfilled by light soils for protecting the slopes again; and the backfilled sands filled in the PVC pipes are taken out every period of time according to actual conditions of highway differential settlement so as to achieve the settlement control effect. The traffic is normal in construction; the drilling holes little damage pavement structure layers; and the PVC pipes replace the embankment backfilled soils to achieve the effect of lightening the weight of the embankments, so that the roadbed post-construction settlement is largely reduced. The method is simple and clear in construction procedures, convenient for construction, economic, efficient and excellent in implementation effect.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and traffic engineering, in particular to a method for controlling the lightweight settlement of an existing expressway (railway) embankment. Background technique [0002] my country's highway construction is developing rapidly, and most of my country's highways are located in the eastern coastal areas, and there are a large number of soft soil foundations in the eastern coastal areas, so the problem of highway foundation settlement needs to be solved urgently. In the construction of expressways in soft soil areas, it is necessary to solve the problem of uneven settlement of the roadbed, especially at the bridgehead position. my country's "Code for Design of Highway Subgrade" (JTG / D30-2004) stipulates that the post-construction settlement of the general road section is less than 30cm, the post-construction settlement of the bridge head transition section is less than 20cm, and the post-c...

AI Technical Summary

Problems solved by technology

If the road surface of the expressway is not smooth enough, it will affect the driving comfort

At the same time, the impact force when the vehicle is driving is likely to cause a vicious circle, the cost of road maintenance is very high, and it affects driving safety

Existing highways in soft soil areas are prone to long-term deformation, and the differential settlement continues to increase, which affects the normal use of highways

In the design scheme, the filling density of the embankment is relatively high, and the road foundation bears the upper load for a long time, which will easily cause large settlement. Especially for the foundation treatment methods of structures, transition sections and general road sections, large differential settlement will lead to pavement damage.

[0004] Before the present invention, the method of dealing with the settlement of the existing soft soil expressway was to lay pavement materials to fill up the subsidence part, so that the pavement can be leveled, but the pavement materials have the following disadvantages: the paved materials have a large bulk density and are applied to the embankment as a permanent load , new additional stress will be generated in the soft soil foundation, which will further cause the foundation to settle. After the foundation settles, the pavement will have differential settlement again, and the pavement material needs to be paved again, which will generate new loads and form a vicious circle. Therefore, this method It is a method to cure the symptoms but not the root cause, it cannot fundamentally solve the problem of road settlement, and it requires a lot of road maintenance costs

However, due to the high filling height of embankment at the bridge head and other road sections prone to differential settlement, the construction period of re-strengthening the foundation is long and the cost is high, which affects the normal opening of the road. It is not an economical and efficient foundation treatment method

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