Plateau cold and arid region strong alkali salinized soil roadbed construction method

Abstract

The invention discloses a construction method of a strong alkali saline soil roadbed in a plateau cold and arid area, which comprises the following construction quality measures: roadbed filler selection, original ground treatment, geomembrane (cloth) separation layer arrangement, water content control, compactness control, structure corrosion prevention, special roadbed treatment and the like. The utilization rate of excavated earthwork is increased, ecological and environment-friendly damage is reduced, the construction quality is improved, the cost-reducing and efficiency-increasing effects are remarkable, the occurrence probability of related diseases is greatly reduced, and the investment cost of later maintenance is effectively reduced. According to the method, the diseases such as salt expansion, melt sinking, frost boiling, corrosion and secondary salinization caused by the strong-alkali salinized soil in the plateau cold and arid region to roadbed engineering are effectively solved, a more advanced construction method is provided for construction of similar engineering, and the popularization and application prospects are wide.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a construction method for a strong alkali saline soil subgrade in a plateau cold and drought area. Background technique [0002] The surrounding areas of the hinterland of the Qaidam Basin have a warm temperate plateau desert and arid climate, with large temperature differences between day and night, strong sunlight, cold, dry, and oxygen-deficient. The annual average temperature is 4.14°C, the minimum temperature is -29.5°C, the maximum permafrost depth is 229 cm, and the frost-free period is about 90 days; the annual average precipitation is 41.3 mm, and the annual average precipitation in Laomangya is less than 15 mm; the annual average evaporation is 2692.1 mm . The saline soil is widely distributed in the construction area, with a total of 7786.7m / 14 sections of saline soil, accounting for 59.9% of the total length of the line. [0003] In Haixi Prefecture...

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Problems solved by technology

[0003] In Haixi Prefecture, Qinghai Province, it is difficult to construct subgrade projects in the environment of cold, arid, desert and saline soil, and the strong alkali saline soil in the plateau cold and arid area will cause salt swelling and subsidence of subgrade projects. , Slurry, corrosion and secondary salinization and other diseases. At the same time, the utilization rate of excavated earthwork is low, which is easy to cause ecological and environmental protection damage. The construction quality is difficult to guarantee. The probability of related diseases is relatively high, and the investment cost of later maintenance is relatively high. exist

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