Waterproof roadbed structure of railway in coastal high-water-level area and construction method of waterproof roadbed structure

Abstract

The invention discloses a coastal high-water-level area railway waterproof roadbed structure and a construction method thereof. The structure comprises a desilting replacement filling layer, a graded broken stone crack pouring layer, a waterproof layer and a waterproof protection layer which are sequentially laid from bottom to top; the waterproof layer comprises a reinforced concrete roadbed groove integrally poured above the graded broken stone crack pouring layer; the inner side, the outer side and the bottom of the reinforced concrete roadbed groove are coated with asphalt waterproof layers and filled with graded broken stone stable layers, the top of the reinforced concrete roadbed groove is sealed through an asphalt waterproof sealing layer, and the waterproof protection layer comprises an asphalt concrete layer and a graded broken stone bottom ballast layer which are sequentially laid on the asphalt waterproof sealing layer; and sleepers and steel rails are laid above the graded broken stone bottom ballast layer through railway ballasts. The structure is fully utilized to meet the requirement for the bearing capacity of the railway roadbed, the protection effect is well achieved through the waterproof characteristic of asphalt and asphalt concrete, the integrity is better, the roadbed stability is higher, and the roadbed has the advantages of being convenient to construct, low in cost and wide in application range.

Description

technical field [0001] The invention relates to the technical field of railway embankment waterproof construction, in particular to a railway waterproof embankment structure and a construction method in coastal high water level areas. Background technique [0002] The subgrade structure is the area most affected by train dynamic load, climate and environment (rainwater, surface water, groundwater and freeze-thaw), and it is required to have sufficient strength and rigidity. The graded crushed stone material used as roadbed filler can only provide sufficient bearing capacity and perform its function under the optimal moisture content state. Under the erosion and softening of water, it will gradually lose its function, affecting the comfort and safety of train operation. . Especially in the coastal environment, the primary soil is mostly muddy soil with insufficient bearing capacity, and the groundwater level is high. Under the action of tides, the groundwater level changes f...

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Problems solved by technology

The graded crushed stone material used as roadbed filler can only provide sufficient bearing capacity and perform its function under the optimal moisture content state. Under the erosion and softening of water, it will gradually lose its function, affecting the comfort and safety of train operation.

Especially in the coastal environment, the primary soil is mostly muddy soil with insufficient bearing capacity, and the groundwater level is high. Under the action of tides, the groundwater level changes frequently. The high salinity and frequent changes of the groundwater can easily cause damage to the subgrade structure. How to avoid The impact of groundwater in coastal areas on the structure of railway subgrades, ensuring the safety of railway operations, is a difficult point in the design of subgrade structures for coastal railways

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