Layered grouting reinforcement method for ballast track bed frost boiling and mud pumping treatment

Abstract

The invention discloses a ballast track bed frost boiling and mud emitting regulation layered grouting reinforcement method. The method comprises the steps that grouting holes are drilled in a ballast track bed frost boiling and mud emitting area to be regulated; a surface layer rapid hardening grouting material, a middle layer grouting material and a lower layer grouting material are sequentially injected into the surface layer, the middle layer and the lower layer of the mud pumping area through grouting pipes which are inserted into the grouting holes and have different depths; and after the grouting material is completely condensed, reinforcement of the frost boiling and mud emitting area is achieved. According to the technical scheme, a non-excavation type grouting reinforcement mode is adopted, grout returning, pollution to the track foundation bed and dismantling of the ballast track foundation bed can be avoided, punching and grouting are conducted on an existing structure foundation, the ballast track foundation bed can be softened through skylight time, and reinforcement and renovation can be achieved on the damage caused by frost boiling and mud pumping; and the grouting reinforcement depth can be improved.

Description

technical field [0001] The invention relates to the technical field of geological restoration, and in particular to a layered grouting reinforcement method for the treatment of ballasted ballast bed turning and mud-ejecting. Background technique [0002] Slurry and slopping of the subgrade bed is one of the common roadbed diseases of ballasted track railways in my country, especially in the rainy areas of the south, which is more serious and common. This is because under the long-term cycle of train loads and environmental loads, the water-proof and drainage performance of the sand cushion between the ballasted track subgrade and the track subgrade gradually decreases and loses, resulting in ballast and subgrade soil being eroded by water and trains. Under the joint action of loads, the cross-migration makes part of the subgrade soil become mud and rises to the surface of the track bed under the "pumping action", resulting in hardening of the track bed and uneven rigidity of...

AI Technical Summary

Problems solved by technology

Although this method has a certain effect, it needs to block the line, the construction progress is slow, the supporting equipment and personnel needs are large, the material consumption is large, the efficiency is low, the construction risk is relatively high, and it is difficult to meet the skylight time of only a few hours. maintenance needs

In addition, the on-site investigation found that the recurrence rate of the mud-flowing disease is relatively high after a few years of operation in the section after the overall excavation and replacement. Practice has shown that it is difficult to eradicate the mud-raising disease

[0004] The subgrade bed of the ballasted track is slopping and mud-flowing occurs in the shallow layer, that is, within 50 cm below the subgrade bed of the ballasted track. Due to factors such as rain, the subgrade bed has softened, resulting in a decrease in bearing capacity. Under the action of the train load, The upper part of the ballasted track bed is easy to invade into the bed, and the fine particles of the bed will also enter the ballasted track bed in the opposite direction, resulting in hardening of the ballasted track bed and uneven settlement of the rail surface, affecting track stiffness and track smoothness , therefore, it is necessary to strengthen and rectify the mud-flowing disease of the ballasted track bed. The usual method is to seal the line, remove the ballasted track bed, clean the weak bed, and then backfill the filler, which is compacted by rolling After that, lay the ballasted track and vibrate it compactly before opening the line

It can be seen that the previous method is more complicated and needs to block the line, which cannot be completed within the time of the skylight point, and the work efficiency is slow and the economy is poor

[0005] In addition, the existing grouting process is single-layer grouting, that is, grouting is performed through a grouting pipe. This process is also suitable for deep layer grouting, because the grouting hole of deep layer grouting is deep, and the grouting material is not It is easy to spread to the surface layer, but it is easy to cause the grouting material to return grout and leak grout when grouting in the shallow layer.

In addition, when single-hole grouting is performed, the grouting pressure is single, the grouting expansion radius is limited, and the reinforcement range is limited. Therefore, the single-shot grouting process is not suitable for the treatment of weak track bed and mud-flooding

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