Construction method for salty soil district railway roadbed with water content lower than liquid limit
A technology of railway subgrade and construction method, applied in the directions of roads, roads, buildings, etc., can solve the problems of high freight, poor economy, long distance, etc., and achieve the effects of improving service life, reducing rising height, and preventing salinization.
Active Publication Date: 2015-06-03
CHINA RAILWAY 21ST BUREAU GROUP THE FOURTH ENG
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Problems solved by technology
In saline soil areas, when the water content is lower than the liquid limit, in this geological environment, the current filling method meets the requirements of the "Technical Guidelines for the Construction of Passenger and Freight Railway Subgrade Engineering" (TZ202-2008), and the embankment below the foundation bed Use A, B, C group filler or improved soil for filling; the disadvantage of this construction method is that the required filler is far away from the saline soil section, the filler transportation is difficult, the freight is relatively high, and the economy is poor. The construction period is also longer
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[0025] The following embodiments can describe the present invention in more detail:
[0026] a. Subgrade Surface Treatment
[0027] Remove the super-salt soil layer, salt crust and salt frost on the surface with a thickness of 0.5m. The base salt crust and the soil with salt content exceeding the allowable value are all removed and discarded at the lower side of the line. The removed salt The soaked soil should be treated as spoil, and discarded to a depression 100m away from the slope foot of the embankment, so as to prevent the water flow from washing the salt stains back into the embankment and corroding the embankment. It is 0.5m, and the YZ20T road roller is used to compact the pavement after leveling;
[0028] b. Test the saline soil soil in the soil borrowing site
[0029] Sampling and testing the saline soil filling in the borrow field, every 1000m 3 One set of tests shall be made for the filler, and 3 soil samples shall be taken for each set. If the amount of soil ...
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The invention discloses a construction method for a salty soil district railway roadbed with the water content lower than a liquid limit. The construction method comprises the working process of treating a roadbed surface, testing salty soil, filling a sand stone layer, paving a gravel reversed filter layer, filling a salty soil layer, paving a sand cushion layer, and constructing water drainage ditches. By the construction method, the handy salty soil is taken as a railway roadbed filling, so that the problem of lack of salty district roadbed fillings is solved, the materials are readily available, the cost is saved, and the construction method is economical and environmentally-friendly; the longitudinal water drainage ditches are arranged outside slopes on two sides of the roadbed, so that land drainage is facilitated, an underground water level as well as underground capillary water raising height can be reduced, an effect of alleviating pollution of salined wind sand particles to a ballast bed and the roadbed is achieved, and the service life of the salty district railway roadbed is prolonged; and the two sides of the roadbed are widened, so that the roadbed can be protected, and salination of a body of the railway roadbed is prevented.
Description
technical field [0001] The invention relates to a construction method of a railway subgrade, in particular to a construction method of a railway subgrade in a saline soil section where the water content is lower than the liquid limit, and belongs to the technical field of railway construction. Background technique [0002] Railway subgrade is an important part of railway engineering, and it is the foundation to bear the load of track and train. As a geotechnical structure, the subgrade must be strong, stable and durable, so as to resist the influence of various natural factors and ensure the safety and smoothness of railway transportation; as the focus of railway construction project management, subgrade construction quality control is the key to effectively reducing subgrade settlement. , The key to ensuring the safety of railway transportation. With the large-scale construction and development of my country's railway transportation projects, the railway construction in we...
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IPC IPC(8): E01C3/04
Inventor 黄君洲薛吉安吕俊团李寿福张靖雄
Owner CHINA RAILWAY 21ST BUREAU GROUP THE FOURTH ENG